[1] Which of the following statements about phloem transport is correct?
A.
phloem transport occurs unidirectionally
B.
gravity influences phloem transport
C.
Ca+ is the most abundantcation in phloem sap
D.
sugar is transported in phloem as nonreducing sugar
Ans:
sugar is transported in phloem as nonreducing sugar
Explanation :
According to most textbooks, only non-reducing carbohydrate species such as sucrose, sugar alcohols, and raffinose family sugars function as phloem translocates. In non-reducing sugar, the hydroxyl group on the anomeric carbon, the number one car-bon, is tied up which means that they are less reactive and more chemically stable. Exclusive transport of non-reducing sugars probably reflects packaging of carbohydrate in a chemical form which protects it from being metabolized.
[2] What causes the mottling of the dental enamel?
A.
High levels of chlorine in water
B.
High levels of nitrate in the water
C.
High levels of fluorides in the water
D.
High levels of calcium in the water
Ans:
High levels of fluorides in the water
Explanation :
The mottling of dental enamel is an extremely common disorder, characterized by hypomineralization of tooth enamel caused by ingestion of excessive fluoride during enamel formation. It is also known as dental fluorosis. Common causes of fluorosis include: fluoridated drinking water (particularly during infancy), ingestion of fluoride toothpaste, use of fluoride tablets, and consumption of processed foods made with fluoridated water.
[3] Intensive cultivation refers to
A.
production with intensive use of labour
B.
production with intensive use of fertilizer
C.
raising production by intensive use of existing land
D.
raising production by large scale use of imported inputs
Ans:
raising production by intensive use of existing land
Explanation :
Intensive farming is an agricultural intensification and mechanization system that aims to maximize yields from available land through various means, such as heavy use of pesticides and chemical fertilizers. It is characterized by a low fallow ratio, higher use of inputs such as capital and labour, and higher crop yields per unit land area.
[4] Which one of the following statements about PYROLYSIS, which is a process for solid waste treatment is incorrect?
A.
It converts the waste into solid, liquid and gas of which the resultant liquid and gas can be used to produce energy.
B.
The process occurs at a temperature above 430°C at atmospheric pressure.
C.
The process occurs under high pressure at temperature above 430° C.
D.
It is a thermo chemical decomposition of organic waste
Ans:
The process occurs at a temperature above 430°C at atmospheric pressure.
Explanation :
Pyrolysis is a thermo-chemical decomposition of organic material at elevated temperatures in the absence of oxygen (or any halogen). Pyrolysis generally takes place well above atmospheric pressure at temperatures exceeding above 430 °C.
[5] In bio fortification technique plant breeders use breeding to overcome -
A.
Loss due to insect pests
B.
Decrease in food production
C.
Deficiencies of micronutrients and vitamins
D.
Loss due to plant diseases
Ans:
Deficiencies of micronutrients and vitamins
Explanation :
Biofortification refers to the breeding of crops to increase their nutritional value. The crops produced through biofortification method are always rich in nutrients like iron, zinc and Vitamin A. for example, Golden rice was produced using the method of bio-fortification. This rice is rich in beta-carotene and provides vitamin A to the children.
[6] Rotation of crops is essential -
A.
For increasing the quantity of minerals.
B.
For decreasing the quantity of proteins.
C.
For getting different kinds of crops.
D.
For increasing fertility of the soil.
Ans:
For increasing fertility of the soil.
Explanation :
Crop rotation is the practice of growing a series of dissimilar/different types of crops in the same area in sequenced seasons. It gives various nutrients to the soil, thus, maintaining soil fertility, organic matter levels and soil structure. It also helps in the replenishment of nitrogen through the use of green manure in sequence with cereals and other crops.
[7] What do you understand by the term Dark Fermentation'?
A.
It is a method to dispose nuclear wastes.
B.
It is a method to produce methane from organic wastes.
C.
It is a method to reduce COD in the atmosphere.
D.
It is a method to produce Hydrogen as a fuel from waste water.
Ans:
It is a method to produce Hydrogen as a fuel from waste water.
Explanation :
Dark fermentation is the fermentative conversion of organic substrate to bio-hydrogen. It is a complex process manifested by diverse groups of bacteria, involving a series of biochemical reactions using three steps similar to anaerobic conversion. Wastewater is used as a potential substrate for bio-hydrogen production in the dark fermentation process.
[8] Which of the following listed is not a feature of organic farming?
A.
The non-use of chemical fertilizers and pesticides
B.
Soil is nurtured for furture use by maintaining micro-organisms
C.
Use of synthetic fertilizers
D.
Very less energy consumption
Ans:
Use of synthetic fertilizers
Explanation :
Organic farming is a form of agriculture that relies on techniques such as crop rotation, green manure, compost, and biological pest control. It uses fertilizers and pesticides if they are considered natural (such as bone meal from animals or pyrethrin from flowers), but it excludes the use of synthetic petrochemical fertilizers and pesticides, plant growth regulators, etc.
[9] Which of the following series is true about energy flow in an ecosystem?
A.
Producers Decomposers Consumers
B.
Decomposers Consumers Producers
C.
Producers --> Consumers ----> Decomposers.
D.
Consumers --> Producers Decomposers.
Ans:
Producers --> Consumers ----> Decomposers.
Explanation :
0
[10] Rate of cooling depends on the -
A.
Temperature difference between the body and the surroundings
B.
Nature of the radiating surface
C.
Area of the radiating surface
D.
All of these
Ans:
All of these
Explanation :
Newton's Law of Cooling states that the rate of temperature of the body is proportional to the difference between the temperature of the body and that of the surrounding medium. When a body cools by radiation, then rate of cooling depends upon the following factors: • Nature of the radiating surface, that is, emissivity; • Area of the radiating surface; • Mass of the radiating surface; 10 Specific heat of the radiating body; • Temperature of radiating body and ♦ Temperature of the surrounding.
[11] What is the Kyoto Protocol?
A.
It is an agreement among countries to take steps for reducing acid rain
B.
It is an agreement among countries to take steps for planting trees to control pollution
C.
It is an agreement among countries to start using nuclear energy
D.
It is an agreement among countries to take steps for reducing global warming
Ans:
It is an agreement among countries to take steps for reducing global warming
Explanation :
The Kyoto Protocol is an international treaty, which extends the 1992 United Nations Framework Convention on Climate Change (UNFCCC) that commits State Parties to reduce greenhouse gases emissions, based on the premise that (1) global warming exists and (2) man-made CO2 emissions have caused it. -----------x----------
[12] The non-living characteristic of viruses is –
A.
ability to multiply only inside the host
B.
ability to cause diseases in the host
C.
ability to undergo mutation
D.
ability to be crystallise
Ans:
ability to be crystallise
Explanation :
Viruses are known as a connecting link between non-living and living being.
[13] What is silverfish?
A.
A silvery freshwater fish
B.
Leaf of silver oak
C.
A small silvery wingles insect
D.
An American fox with a silvery fur
Ans:
A small silvery wingles insect
Explanation :
A silverfish (Lepisma saccharina) is a small, wingless insect in the order Zygentoma (formerly Thysanura). Its common name derives from the animal's silvery light grey color, combined with the fish- like appearance of its movements.
[14] A genetically engineered form of brinjal known as the BT brinjal has been developed. The objective of this is -
A.
to make it pest resistant
B.
to improve its taste and nutritive value
C.
to make it drought resistant
D.
to make its shelflife longer
Ans:
to make it pest resistant
Explanation :
Bt Brinjal is a genetically modified (GM) crop created by inserting Cry1Ac gene from the soil bacterium Bacillus thuringiensis into Brinjal. The insertion of the gene gives Brinjal plant resistance against lepidopteron pets/insects like the Brinjal Fruit and Shoot Borer (Leucinodes orbonalis) and Fruit Borer (Helicoverpa armigera).
[15] The cause of Heart attack is:
A.
bacteria
B.
virus
C.
lack of blood supply to the heart
D.
impairment of heart's working due to unknown reason
Ans:
lack of blood supply to the heart
Explanation :
Heart attack is the death of a segment of heart muscle caused by the loss of blood supply. It occurs when the blood flow that brings oxygen to the heart muscle is severely reduced or cut off completely. The blood supply is usually lost because a coronary artery, one that supplies blood to the heart muscle, is blocked by a blood clot (coronary thrombosis).
[16] Tachycardia is a condition characterized by
A.
heart-rate decreases from the normal
B.
heart- rate increases from the normal
C.
heart-beat stops
D.
heart fails to pump
Ans:
heart- rate increases from the normal
Explanation :
Tachycardia is a heart rate that exceeds the normal resting rate. In general, a resting heart rate over 100 beats per minute is accepted as tachycardia in adults. A healthy adult heart normally beats 60 to 100 times a minute when a person is at rest. Tachycardia occurs when an abnormality in the heart produces rapid electrical signals.
[17] Ecosystem consists of :
A.
A biotic community and its non-living elements
B.
Population
C.
A population and its non-living elements
D.
A biotic community
Ans:
A biotic community and its non-living elements
Explanation :
An ecosystem is defined as any community of living and non-living things that work together. Biotic components are the living things that shape an eco-system. All non-living components of an ecosystem is called a biotic components such as temperature, light, moisture, air currents, etc.
[18] What are Lipids?
A.
Lipids are monosaccharide
B.
Lipids do not provide energy to cells
C.
Fruits are a good source of lipids
D.
Cholesterol and trans fatty acids are types of Lipids
Ans:
Cholesterol and trans fatty acids are types of Lipids
Explanation :
Lipids are a group of naturally occurring molecules that include fats, waxes, sterols, fat-soluble vitamins (such as vitamins A, D, E, and K), monoglycerides, diglycerides, triglycerides, phospholipids, and others. They encompass molecules such as fatty acids and their derivatives (including tri-, di-, monoglycerides, and phospholipids), as well as other sterol= containing metabolites such as cholesterol.
[19] Which of the following is least likely to be an effect of global warming?
A.
Increased frequency of hurricanes
B.
Loss of fertile delta region as for agriculture
C.
Decreased rate of photosynthesis in vegetation
D.
Shrinking of the polar ice regions
Ans:
Decreased rate of photosynthesis in vegetation
Explanation :
Global warming is the current increase in temperature of the Earth's surface (both land and water) as well as it's atmosphere. Climatologists believe that it will lead to extreme weather conditions such as increase in the frequency and strength of hurricanes, increase in sea level and submergence of deltaic regions due to melting of polar ice, coupled with melting ice sheets and glaciers across Greenland, North America, South America, Europe and Asia. However, the gradual heating of Earth's surface, oceans and atmosphere will not affect photosynthesis.
[20] Leaves of many grasses are capable of folding and unfolding because -
A.
their mesophyll is not differentiated into palisade and spongy parenchyma
B.
they have stomata on both sides of the leaf
C.
they have high levels of silica
D.
they have specialised bulliform cells
Ans:
they have specialised bulliform cells
Explanation :
Bulliform cells are large, bubble-shaped epidermal cells that occur in groups on the upper surface of the leaves of many grasses. These cells, by their turgor changes, cause rolling and unrolling of the leaves thus regulating water loss.
[21] Diamond does not conduct electricity, because -
A.
It's structure is very compact
B.
It is of crystalline nature
C.
There are only carbon atoms present in it
D.
No free electrons are present in it
Ans:
No free electrons are present in it
Explanation :
Diamond has a giant molecular structure. Each carbon atom is covalently bonded to four other carbon atoms. There are no free electrons or ions in diamond; so it does not conduct electricity. Except for most blue diamonds, which are semiconductors, diamonds are good electrical insulators.
[22] 'Gynecomastia' is -
A.
Development of hair on ears in males
B.
Increased height in females
C.
Development of an extra finger in females
D.
Development of breasts in males
Ans:
Development of breasts in males
Explanation :
Gynecomastia is swelling of the breast tissue in boys or men, caused by an imbalance of the hormones estrogen and testosterone. The development of gynecomastia is usually associated with benign pubertal change. Disturbances in the endocrine system that lead to an increase in the ratio of estrogens/androgens are thought to be responsible for the development of gynecomastia.
[23] Biofortifieation is a -
A.
method of breeding crops to increase their nutritional value
B.
strategy to combat unwanted nutrients in plants
C.
method of developing resistance to insect pests
D.
method of plant breeding for disease resistance
Ans:
method of breeding crops to increase their nutritional value
Explanation :
Biofortification is the breeding crops to increase their nutritional value. This can be done either through conventional selective breeding or genetic engineering. Biofortification differs from ordinary fortification because it focuses on making plant foods more nutritious as the plants are growing, rather than having nutrients added to the foods when they are being processed.
[24] Which of the following statements is true?
A.
Animals worry about raising their family
B.
Animals make several feeding trips in a day
C.
Animals often behave sensibly
D.
Animals do not know meaning of brotherhood
Ans:
Animals make several feeding trips in a day
Explanation :
Animal Kingdom is usually a short day; they take several feeding trips in a day. Big birds and antelope feed several times a day.
[25] If a healthy freshwater fish is placed in salt water, what will be the expected consequence?
A.
The fish becomes dehydrated and dies
B.
The fish becomes bloated and dies
C.
The fish suffers from fungal or bacterial disease and dies
D.
There is no observable effect on the fish provided there is sufficient food
Ans:
The fish becomes dehydrated and dies
Explanation :
When freshwater fish is placed in salt water, the water molecules contained in the fish's body would pass through the cell membranes of the fish, causing the fish to lose water by diffusion. This sudden change in the molecular makeup of the fish would cause the fish to die.
Explanation :
According to most textbooks, only non-reducing carbohydrate species such as sucrose, sugar alcohols, and raffinose family sugars function as phloem translocates. In non-reducing sugar, the hydroxyl group on the anomeric carbon, the number one car-bon, is tied up which means that they are less reactive and more chemically stable. Exclusive transport of non-reducing sugars probably reflects packaging of carbohydrate in a chemical form which protects it from being metabolized.
[2] What causes the mottling of the dental enamel?
A.
High levels of chlorine in water
B.
High levels of nitrate in the water
C.
High levels of fluorides in the water
D.
High levels of calcium in the water
Ans:
High levels of fluorides in the water
Explanation :
The mottling of dental enamel is an extremely common disorder, characterized by hypomineralization of tooth enamel caused by ingestion of excessive fluoride during enamel formation. It is also known as dental fluorosis. Common causes of fluorosis include: fluoridated drinking water (particularly during infancy), ingestion of fluoride toothpaste, use of fluoride tablets, and consumption of processed foods made with fluoridated water.
[3] Intensive cultivation refers to
A.
production with intensive use of labour
B.
production with intensive use of fertilizer
C.
raising production by intensive use of existing land
D.
raising production by large scale use of imported inputs
Ans:
raising production by intensive use of existing land
Explanation :
Intensive farming is an agricultural intensification and mechanization system that aims to maximize yields from available land through various means, such as heavy use of pesticides and chemical fertilizers. It is characterized by a low fallow ratio, higher use of inputs such as capital and labour, and higher crop yields per unit land area.
[4] Which one of the following statements about PYROLYSIS, which is a process for solid waste treatment is incorrect?
A.
It converts the waste into solid, liquid and gas of which the resultant liquid and gas can be used to produce energy.
B.
The process occurs at a temperature above 430°C at atmospheric pressure.
C.
The process occurs under high pressure at temperature above 430° C.
D.
It is a thermo chemical decomposition of organic waste
Ans:
The process occurs at a temperature above 430°C at atmospheric pressure.
Explanation :
Pyrolysis is a thermo-chemical decomposition of organic material at elevated temperatures in the absence of oxygen (or any halogen). Pyrolysis generally takes place well above atmospheric pressure at temperatures exceeding above 430 °C.
[5] In bio fortification technique plant breeders use breeding to overcome -
A.
Loss due to insect pests
B.
Decrease in food production
C.
Deficiencies of micronutrients and vitamins
D.
Loss due to plant diseases
Ans:
Deficiencies of micronutrients and vitamins
Explanation :
Biofortification refers to the breeding of crops to increase their nutritional value. The crops produced through biofortification method are always rich in nutrients like iron, zinc and Vitamin A. for example, Golden rice was produced using the method of bio-fortification. This rice is rich in beta-carotene and provides vitamin A to the children.
[6] Rotation of crops is essential -
A.
For increasing the quantity of minerals.
B.
For decreasing the quantity of proteins.
C.
For getting different kinds of crops.
D.
For increasing fertility of the soil.
Ans:
For increasing fertility of the soil.
Explanation :
Crop rotation is the practice of growing a series of dissimilar/different types of crops in the same area in sequenced seasons. It gives various nutrients to the soil, thus, maintaining soil fertility, organic matter levels and soil structure. It also helps in the replenishment of nitrogen through the use of green manure in sequence with cereals and other crops.
[7] What do you understand by the term Dark Fermentation'?
A.
It is a method to dispose nuclear wastes.
B.
It is a method to produce methane from organic wastes.
C.
It is a method to reduce COD in the atmosphere.
D.
It is a method to produce Hydrogen as a fuel from waste water.
Ans:
It is a method to produce Hydrogen as a fuel from waste water.
Explanation :
Dark fermentation is the fermentative conversion of organic substrate to bio-hydrogen. It is a complex process manifested by diverse groups of bacteria, involving a series of biochemical reactions using three steps similar to anaerobic conversion. Wastewater is used as a potential substrate for bio-hydrogen production in the dark fermentation process.
[8] Which of the following listed is not a feature of organic farming?
A.
The non-use of chemical fertilizers and pesticides
B.
Soil is nurtured for furture use by maintaining micro-organisms
C.
Use of synthetic fertilizers
D.
Very less energy consumption
Ans:
Use of synthetic fertilizers
Explanation :
Organic farming is a form of agriculture that relies on techniques such as crop rotation, green manure, compost, and biological pest control. It uses fertilizers and pesticides if they are considered natural (such as bone meal from animals or pyrethrin from flowers), but it excludes the use of synthetic petrochemical fertilizers and pesticides, plant growth regulators, etc.
[9] Which of the following series is true about energy flow in an ecosystem?
A.
Producers Decomposers Consumers
B.
Decomposers Consumers Producers
C.
Producers --> Consumers ----> Decomposers.
D.
Consumers --> Producers Decomposers.
Ans:
Producers --> Consumers ----> Decomposers.
Explanation :
0
[10] Rate of cooling depends on the -
A.
Temperature difference between the body and the surroundings
B.
Nature of the radiating surface
C.
Area of the radiating surface
D.
All of these
Ans:
All of these
Explanation :
Newton's Law of Cooling states that the rate of temperature of the body is proportional to the difference between the temperature of the body and that of the surrounding medium. When a body cools by radiation, then rate of cooling depends upon the following factors: • Nature of the radiating surface, that is, emissivity; • Area of the radiating surface; • Mass of the radiating surface; 10 Specific heat of the radiating body; • Temperature of radiating body and ♦ Temperature of the surrounding.
[11] What is the Kyoto Protocol?
A.
It is an agreement among countries to take steps for reducing acid rain
B.
It is an agreement among countries to take steps for planting trees to control pollution
C.
It is an agreement among countries to start using nuclear energy
D.
It is an agreement among countries to take steps for reducing global warming
Ans:
It is an agreement among countries to take steps for reducing global warming
Explanation :
The Kyoto Protocol is an international treaty, which extends the 1992 United Nations Framework Convention on Climate Change (UNFCCC) that commits State Parties to reduce greenhouse gases emissions, based on the premise that (1) global warming exists and (2) man-made CO2 emissions have caused it. -----------x----------
[12] The non-living characteristic of viruses is –
A.
ability to multiply only inside the host
B.
ability to cause diseases in the host
C.
ability to undergo mutation
D.
ability to be crystallise
Ans:
ability to be crystallise
Explanation :
Viruses are known as a connecting link between non-living and living being.
[13] What is silverfish?
A.
A silvery freshwater fish
B.
Leaf of silver oak
C.
A small silvery wingles insect
D.
An American fox with a silvery fur
Ans:
A small silvery wingles insect
Explanation :
A silverfish (Lepisma saccharina) is a small, wingless insect in the order Zygentoma (formerly Thysanura). Its common name derives from the animal's silvery light grey color, combined with the fish- like appearance of its movements.
[14] A genetically engineered form of brinjal known as the BT brinjal has been developed. The objective of this is -
A.
to make it pest resistant
B.
to improve its taste and nutritive value
C.
to make it drought resistant
D.
to make its shelflife longer
Ans:
to make it pest resistant
Explanation :
Bt Brinjal is a genetically modified (GM) crop created by inserting Cry1Ac gene from the soil bacterium Bacillus thuringiensis into Brinjal. The insertion of the gene gives Brinjal plant resistance against lepidopteron pets/insects like the Brinjal Fruit and Shoot Borer (Leucinodes orbonalis) and Fruit Borer (Helicoverpa armigera).
[15] The cause of Heart attack is:
A.
bacteria
B.
virus
C.
lack of blood supply to the heart
D.
impairment of heart's working due to unknown reason
Ans:
lack of blood supply to the heart
Explanation :
Heart attack is the death of a segment of heart muscle caused by the loss of blood supply. It occurs when the blood flow that brings oxygen to the heart muscle is severely reduced or cut off completely. The blood supply is usually lost because a coronary artery, one that supplies blood to the heart muscle, is blocked by a blood clot (coronary thrombosis).
[16] Tachycardia is a condition characterized by
A.
heart-rate decreases from the normal
B.
heart- rate increases from the normal
C.
heart-beat stops
D.
heart fails to pump
Ans:
heart- rate increases from the normal
Explanation :
Tachycardia is a heart rate that exceeds the normal resting rate. In general, a resting heart rate over 100 beats per minute is accepted as tachycardia in adults. A healthy adult heart normally beats 60 to 100 times a minute when a person is at rest. Tachycardia occurs when an abnormality in the heart produces rapid electrical signals.
[17] Ecosystem consists of :
A.
A biotic community and its non-living elements
B.
Population
C.
A population and its non-living elements
D.
A biotic community
Ans:
A biotic community and its non-living elements
Explanation :
An ecosystem is defined as any community of living and non-living things that work together. Biotic components are the living things that shape an eco-system. All non-living components of an ecosystem is called a biotic components such as temperature, light, moisture, air currents, etc.
[18] What are Lipids?
A.
Lipids are monosaccharide
B.
Lipids do not provide energy to cells
C.
Fruits are a good source of lipids
D.
Cholesterol and trans fatty acids are types of Lipids
Ans:
Cholesterol and trans fatty acids are types of Lipids
Explanation :
Lipids are a group of naturally occurring molecules that include fats, waxes, sterols, fat-soluble vitamins (such as vitamins A, D, E, and K), monoglycerides, diglycerides, triglycerides, phospholipids, and others. They encompass molecules such as fatty acids and their derivatives (including tri-, di-, monoglycerides, and phospholipids), as well as other sterol= containing metabolites such as cholesterol.
[19] Which of the following is least likely to be an effect of global warming?
A.
Increased frequency of hurricanes
B.
Loss of fertile delta region as for agriculture
C.
Decreased rate of photosynthesis in vegetation
D.
Shrinking of the polar ice regions
Ans:
Decreased rate of photosynthesis in vegetation
Explanation :
Global warming is the current increase in temperature of the Earth's surface (both land and water) as well as it's atmosphere. Climatologists believe that it will lead to extreme weather conditions such as increase in the frequency and strength of hurricanes, increase in sea level and submergence of deltaic regions due to melting of polar ice, coupled with melting ice sheets and glaciers across Greenland, North America, South America, Europe and Asia. However, the gradual heating of Earth's surface, oceans and atmosphere will not affect photosynthesis.
[20] Leaves of many grasses are capable of folding and unfolding because -
A.
their mesophyll is not differentiated into palisade and spongy parenchyma
B.
they have stomata on both sides of the leaf
C.
they have high levels of silica
D.
they have specialised bulliform cells
Ans:
they have specialised bulliform cells
Explanation :
Bulliform cells are large, bubble-shaped epidermal cells that occur in groups on the upper surface of the leaves of many grasses. These cells, by their turgor changes, cause rolling and unrolling of the leaves thus regulating water loss.
[21] Diamond does not conduct electricity, because -
A.
It's structure is very compact
B.
It is of crystalline nature
C.
There are only carbon atoms present in it
D.
No free electrons are present in it
Ans:
No free electrons are present in it
Explanation :
Diamond has a giant molecular structure. Each carbon atom is covalently bonded to four other carbon atoms. There are no free electrons or ions in diamond; so it does not conduct electricity. Except for most blue diamonds, which are semiconductors, diamonds are good electrical insulators.
[22] 'Gynecomastia' is -
A.
Development of hair on ears in males
B.
Increased height in females
C.
Development of an extra finger in females
D.
Development of breasts in males
Ans:
Development of breasts in males
Explanation :
Gynecomastia is swelling of the breast tissue in boys or men, caused by an imbalance of the hormones estrogen and testosterone. The development of gynecomastia is usually associated with benign pubertal change. Disturbances in the endocrine system that lead to an increase in the ratio of estrogens/androgens are thought to be responsible for the development of gynecomastia.
[23] Biofortifieation is a -
A.
method of breeding crops to increase their nutritional value
B.
strategy to combat unwanted nutrients in plants
C.
method of developing resistance to insect pests
D.
method of plant breeding for disease resistance
Ans:
method of breeding crops to increase their nutritional value
Explanation :
Biofortification is the breeding crops to increase their nutritional value. This can be done either through conventional selective breeding or genetic engineering. Biofortification differs from ordinary fortification because it focuses on making plant foods more nutritious as the plants are growing, rather than having nutrients added to the foods when they are being processed.
[24] Which of the following statements is true?
A.
Animals worry about raising their family
B.
Animals make several feeding trips in a day
C.
Animals often behave sensibly
D.
Animals do not know meaning of brotherhood
Ans:
Animals make several feeding trips in a day
Explanation :
Animal Kingdom is usually a short day; they take several feeding trips in a day. Big birds and antelope feed several times a day.
[25] If a healthy freshwater fish is placed in salt water, what will be the expected consequence?
A.
The fish becomes dehydrated and dies
B.
The fish becomes bloated and dies
C.
The fish suffers from fungal or bacterial disease and dies
D.
There is no observable effect on the fish provided there is sufficient food
Ans:
The fish becomes dehydrated and dies
Explanation :
When freshwater fish is placed in salt water, the water molecules contained in the fish's body would pass through the cell membranes of the fish, causing the fish to lose water by diffusion. This sudden change in the molecular makeup of the fish would cause the fish to die.
Explanation :
Intensive farming is an agricultural intensification and mechanization system that aims to maximize yields from available land through various means, such as heavy use of pesticides and chemical fertilizers. It is characterized by a low fallow ratio, higher use of inputs such as capital and labour, and higher crop yields per unit land area.
[4] Which one of the following statements about PYROLYSIS, which is a process for solid waste treatment is incorrect?
A.
It converts the waste into solid, liquid and gas of which the resultant liquid and gas can be used to produce energy.
B.
The process occurs at a temperature above 430°C at atmospheric pressure.
C.
The process occurs under high pressure at temperature above 430° C.
D.
It is a thermo chemical decomposition of organic waste
Ans:
The process occurs at a temperature above 430°C at atmospheric pressure.
Explanation :
Pyrolysis is a thermo-chemical decomposition of organic material at elevated temperatures in the absence of oxygen (or any halogen). Pyrolysis generally takes place well above atmospheric pressure at temperatures exceeding above 430 °C.
[5] In bio fortification technique plant breeders use breeding to overcome -
A.
Loss due to insect pests
B.
Decrease in food production
C.
Deficiencies of micronutrients and vitamins
D.
Loss due to plant diseases
Ans:
Deficiencies of micronutrients and vitamins
Explanation :
Biofortification refers to the breeding of crops to increase their nutritional value. The crops produced through biofortification method are always rich in nutrients like iron, zinc and Vitamin A. for example, Golden rice was produced using the method of bio-fortification. This rice is rich in beta-carotene and provides vitamin A to the children.
[6] Rotation of crops is essential -
A.
For increasing the quantity of minerals.
B.
For decreasing the quantity of proteins.
C.
For getting different kinds of crops.
D.
For increasing fertility of the soil.
Ans:
For increasing fertility of the soil.
Explanation :
Crop rotation is the practice of growing a series of dissimilar/different types of crops in the same area in sequenced seasons. It gives various nutrients to the soil, thus, maintaining soil fertility, organic matter levels and soil structure. It also helps in the replenishment of nitrogen through the use of green manure in sequence with cereals and other crops.
[7] What do you understand by the term Dark Fermentation'?
A.
It is a method to dispose nuclear wastes.
B.
It is a method to produce methane from organic wastes.
C.
It is a method to reduce COD in the atmosphere.
D.
It is a method to produce Hydrogen as a fuel from waste water.
Ans:
It is a method to produce Hydrogen as a fuel from waste water.
Explanation :
Dark fermentation is the fermentative conversion of organic substrate to bio-hydrogen. It is a complex process manifested by diverse groups of bacteria, involving a series of biochemical reactions using three steps similar to anaerobic conversion. Wastewater is used as a potential substrate for bio-hydrogen production in the dark fermentation process.
[8] Which of the following listed is not a feature of organic farming?
A.
The non-use of chemical fertilizers and pesticides
B.
Soil is nurtured for furture use by maintaining micro-organisms
C.
Use of synthetic fertilizers
D.
Very less energy consumption
Ans:
Use of synthetic fertilizers
Explanation :
Organic farming is a form of agriculture that relies on techniques such as crop rotation, green manure, compost, and biological pest control. It uses fertilizers and pesticides if they are considered natural (such as bone meal from animals or pyrethrin from flowers), but it excludes the use of synthetic petrochemical fertilizers and pesticides, plant growth regulators, etc.
[9] Which of the following series is true about energy flow in an ecosystem?
A.
Producers Decomposers Consumers
B.
Decomposers Consumers Producers
C.
Producers --> Consumers ----> Decomposers.
D.
Consumers --> Producers Decomposers.
Ans:
Producers --> Consumers ----> Decomposers.
Explanation :
0
[10] Rate of cooling depends on the -
A.
Temperature difference between the body and the surroundings
B.
Nature of the radiating surface
C.
Area of the radiating surface
D.
All of these
Ans:
All of these
Explanation :
Newton's Law of Cooling states that the rate of temperature of the body is proportional to the difference between the temperature of the body and that of the surrounding medium. When a body cools by radiation, then rate of cooling depends upon the following factors: • Nature of the radiating surface, that is, emissivity; • Area of the radiating surface; • Mass of the radiating surface; 10 Specific heat of the radiating body; • Temperature of radiating body and ♦ Temperature of the surrounding.
[11] What is the Kyoto Protocol?
A.
It is an agreement among countries to take steps for reducing acid rain
B.
It is an agreement among countries to take steps for planting trees to control pollution
C.
It is an agreement among countries to start using nuclear energy
D.
It is an agreement among countries to take steps for reducing global warming
Ans:
It is an agreement among countries to take steps for reducing global warming
Explanation :
The Kyoto Protocol is an international treaty, which extends the 1992 United Nations Framework Convention on Climate Change (UNFCCC) that commits State Parties to reduce greenhouse gases emissions, based on the premise that (1) global warming exists and (2) man-made CO2 emissions have caused it. -----------x----------
[12] The non-living characteristic of viruses is –
A.
ability to multiply only inside the host
B.
ability to cause diseases in the host
C.
ability to undergo mutation
D.
ability to be crystallise
Ans:
ability to be crystallise
Explanation :
Viruses are known as a connecting link between non-living and living being.
[13] What is silverfish?
A.
A silvery freshwater fish
B.
Leaf of silver oak
C.
A small silvery wingles insect
D.
An American fox with a silvery fur
Ans:
A small silvery wingles insect
Explanation :
A silverfish (Lepisma saccharina) is a small, wingless insect in the order Zygentoma (formerly Thysanura). Its common name derives from the animal's silvery light grey color, combined with the fish- like appearance of its movements.
[14] A genetically engineered form of brinjal known as the BT brinjal has been developed. The objective of this is -
A.
to make it pest resistant
B.
to improve its taste and nutritive value
C.
to make it drought resistant
D.
to make its shelflife longer
Ans:
to make it pest resistant
Explanation :
Bt Brinjal is a genetically modified (GM) crop created by inserting Cry1Ac gene from the soil bacterium Bacillus thuringiensis into Brinjal. The insertion of the gene gives Brinjal plant resistance against lepidopteron pets/insects like the Brinjal Fruit and Shoot Borer (Leucinodes orbonalis) and Fruit Borer (Helicoverpa armigera).
[15] The cause of Heart attack is:
A.
bacteria
B.
virus
C.
lack of blood supply to the heart
D.
impairment of heart's working due to unknown reason
Ans:
lack of blood supply to the heart
Explanation :
Heart attack is the death of a segment of heart muscle caused by the loss of blood supply. It occurs when the blood flow that brings oxygen to the heart muscle is severely reduced or cut off completely. The blood supply is usually lost because a coronary artery, one that supplies blood to the heart muscle, is blocked by a blood clot (coronary thrombosis).
[16] Tachycardia is a condition characterized by
A.
heart-rate decreases from the normal
B.
heart- rate increases from the normal
C.
heart-beat stops
D.
heart fails to pump
Ans:
heart- rate increases from the normal
Explanation :
Tachycardia is a heart rate that exceeds the normal resting rate. In general, a resting heart rate over 100 beats per minute is accepted as tachycardia in adults. A healthy adult heart normally beats 60 to 100 times a minute when a person is at rest. Tachycardia occurs when an abnormality in the heart produces rapid electrical signals.
[17] Ecosystem consists of :
A.
A biotic community and its non-living elements
B.
Population
C.
A population and its non-living elements
D.
A biotic community
Ans:
A biotic community and its non-living elements
Explanation :
An ecosystem is defined as any community of living and non-living things that work together. Biotic components are the living things that shape an eco-system. All non-living components of an ecosystem is called a biotic components such as temperature, light, moisture, air currents, etc.
[18] What are Lipids?
A.
Lipids are monosaccharide
B.
Lipids do not provide energy to cells
C.
Fruits are a good source of lipids
D.
Cholesterol and trans fatty acids are types of Lipids
Ans:
Cholesterol and trans fatty acids are types of Lipids
Explanation :
Lipids are a group of naturally occurring molecules that include fats, waxes, sterols, fat-soluble vitamins (such as vitamins A, D, E, and K), monoglycerides, diglycerides, triglycerides, phospholipids, and others. They encompass molecules such as fatty acids and their derivatives (including tri-, di-, monoglycerides, and phospholipids), as well as other sterol= containing metabolites such as cholesterol.
[19] Which of the following is least likely to be an effect of global warming?
A.
Increased frequency of hurricanes
B.
Loss of fertile delta region as for agriculture
C.
Decreased rate of photosynthesis in vegetation
D.
Shrinking of the polar ice regions
Ans:
Decreased rate of photosynthesis in vegetation
Explanation :
Global warming is the current increase in temperature of the Earth's surface (both land and water) as well as it's atmosphere. Climatologists believe that it will lead to extreme weather conditions such as increase in the frequency and strength of hurricanes, increase in sea level and submergence of deltaic regions due to melting of polar ice, coupled with melting ice sheets and glaciers across Greenland, North America, South America, Europe and Asia. However, the gradual heating of Earth's surface, oceans and atmosphere will not affect photosynthesis.
[20] Leaves of many grasses are capable of folding and unfolding because -
A.
their mesophyll is not differentiated into palisade and spongy parenchyma
B.
they have stomata on both sides of the leaf
C.
they have high levels of silica
D.
they have specialised bulliform cells
Ans:
they have specialised bulliform cells
Explanation :
Bulliform cells are large, bubble-shaped epidermal cells that occur in groups on the upper surface of the leaves of many grasses. These cells, by their turgor changes, cause rolling and unrolling of the leaves thus regulating water loss.
[21] Diamond does not conduct electricity, because -
A.
It's structure is very compact
B.
It is of crystalline nature
C.
There are only carbon atoms present in it
D.
No free electrons are present in it
Ans:
No free electrons are present in it
Explanation :
Diamond has a giant molecular structure. Each carbon atom is covalently bonded to four other carbon atoms. There are no free electrons or ions in diamond; so it does not conduct electricity. Except for most blue diamonds, which are semiconductors, diamonds are good electrical insulators.
[22] 'Gynecomastia' is -
A.
Development of hair on ears in males
B.
Increased height in females
C.
Development of an extra finger in females
D.
Development of breasts in males
Ans:
Development of breasts in males
Explanation :
Gynecomastia is swelling of the breast tissue in boys or men, caused by an imbalance of the hormones estrogen and testosterone. The development of gynecomastia is usually associated with benign pubertal change. Disturbances in the endocrine system that lead to an increase in the ratio of estrogens/androgens are thought to be responsible for the development of gynecomastia.
[23] Biofortifieation is a -
A.
method of breeding crops to increase their nutritional value
B.
strategy to combat unwanted nutrients in plants
C.
method of developing resistance to insect pests
D.
method of plant breeding for disease resistance
Ans:
method of breeding crops to increase their nutritional value
Explanation :
Biofortification is the breeding crops to increase their nutritional value. This can be done either through conventional selective breeding or genetic engineering. Biofortification differs from ordinary fortification because it focuses on making plant foods more nutritious as the plants are growing, rather than having nutrients added to the foods when they are being processed.
[24] Which of the following statements is true?
A.
Animals worry about raising their family
B.
Animals make several feeding trips in a day
C.
Animals often behave sensibly
D.
Animals do not know meaning of brotherhood
Ans:
Animals make several feeding trips in a day
Explanation :
Animal Kingdom is usually a short day; they take several feeding trips in a day. Big birds and antelope feed several times a day.
[25] If a healthy freshwater fish is placed in salt water, what will be the expected consequence?
A.
The fish becomes dehydrated and dies
B.
The fish becomes bloated and dies
C.
The fish suffers from fungal or bacterial disease and dies
D.
There is no observable effect on the fish provided there is sufficient food
Ans:
The fish becomes dehydrated and dies
Explanation :
When freshwater fish is placed in salt water, the water molecules contained in the fish's body would pass through the cell membranes of the fish, causing the fish to lose water by diffusion. This sudden change in the molecular makeup of the fish would cause the fish to die.
Explanation :
Biofortification refers to the breeding of crops to increase their nutritional value. The crops produced through biofortification method are always rich in nutrients like iron, zinc and Vitamin A. for example, Golden rice was produced using the method of bio-fortification. This rice is rich in beta-carotene and provides vitamin A to the children.
[6] Rotation of crops is essential -
A.
For increasing the quantity of minerals.
B.
For decreasing the quantity of proteins.
C.
For getting different kinds of crops.
D.
For increasing fertility of the soil.
Ans:
For increasing fertility of the soil.
Explanation :
Crop rotation is the practice of growing a series of dissimilar/different types of crops in the same area in sequenced seasons. It gives various nutrients to the soil, thus, maintaining soil fertility, organic matter levels and soil structure. It also helps in the replenishment of nitrogen through the use of green manure in sequence with cereals and other crops.
[7] What do you understand by the term Dark Fermentation'?
A.
It is a method to dispose nuclear wastes.
B.
It is a method to produce methane from organic wastes.
C.
It is a method to reduce COD in the atmosphere.
D.
It is a method to produce Hydrogen as a fuel from waste water.
Ans:
It is a method to produce Hydrogen as a fuel from waste water.
Explanation :
Dark fermentation is the fermentative conversion of organic substrate to bio-hydrogen. It is a complex process manifested by diverse groups of bacteria, involving a series of biochemical reactions using three steps similar to anaerobic conversion. Wastewater is used as a potential substrate for bio-hydrogen production in the dark fermentation process.
[8] Which of the following listed is not a feature of organic farming?
A.
The non-use of chemical fertilizers and pesticides
B.
Soil is nurtured for furture use by maintaining micro-organisms
C.
Use of synthetic fertilizers
D.
Very less energy consumption
Ans:
Use of synthetic fertilizers
Explanation :
Organic farming is a form of agriculture that relies on techniques such as crop rotation, green manure, compost, and biological pest control. It uses fertilizers and pesticides if they are considered natural (such as bone meal from animals or pyrethrin from flowers), but it excludes the use of synthetic petrochemical fertilizers and pesticides, plant growth regulators, etc.
[9] Which of the following series is true about energy flow in an ecosystem?
A.
Producers Decomposers Consumers
B.
Decomposers Consumers Producers
C.
Producers --> Consumers ----> Decomposers.
D.
Consumers --> Producers Decomposers.
Ans:
Producers --> Consumers ----> Decomposers.
Explanation :
0
[10] Rate of cooling depends on the -
A.
Temperature difference between the body and the surroundings
B.
Nature of the radiating surface
C.
Area of the radiating surface
D.
All of these
Ans:
All of these
Explanation :
Newton's Law of Cooling states that the rate of temperature of the body is proportional to the difference between the temperature of the body and that of the surrounding medium. When a body cools by radiation, then rate of cooling depends upon the following factors: • Nature of the radiating surface, that is, emissivity; • Area of the radiating surface; • Mass of the radiating surface; 10 Specific heat of the radiating body; • Temperature of radiating body and ♦ Temperature of the surrounding.
[11] What is the Kyoto Protocol?
A.
It is an agreement among countries to take steps for reducing acid rain
B.
It is an agreement among countries to take steps for planting trees to control pollution
C.
It is an agreement among countries to start using nuclear energy
D.
It is an agreement among countries to take steps for reducing global warming
Ans:
It is an agreement among countries to take steps for reducing global warming
Explanation :
The Kyoto Protocol is an international treaty, which extends the 1992 United Nations Framework Convention on Climate Change (UNFCCC) that commits State Parties to reduce greenhouse gases emissions, based on the premise that (1) global warming exists and (2) man-made CO2 emissions have caused it. -----------x----------
[12] The non-living characteristic of viruses is –
A.
ability to multiply only inside the host
B.
ability to cause diseases in the host
C.
ability to undergo mutation
D.
ability to be crystallise
Ans:
ability to be crystallise
Explanation :
Viruses are known as a connecting link between non-living and living being.
[13] What is silverfish?
A.
A silvery freshwater fish
B.
Leaf of silver oak
C.
A small silvery wingles insect
D.
An American fox with a silvery fur
Ans:
A small silvery wingles insect
Explanation :
A silverfish (Lepisma saccharina) is a small, wingless insect in the order Zygentoma (formerly Thysanura). Its common name derives from the animal's silvery light grey color, combined with the fish- like appearance of its movements.
[14] A genetically engineered form of brinjal known as the BT brinjal has been developed. The objective of this is -
A.
to make it pest resistant
B.
to improve its taste and nutritive value
C.
to make it drought resistant
D.
to make its shelflife longer
Ans:
to make it pest resistant
Explanation :
Bt Brinjal is a genetically modified (GM) crop created by inserting Cry1Ac gene from the soil bacterium Bacillus thuringiensis into Brinjal. The insertion of the gene gives Brinjal plant resistance against lepidopteron pets/insects like the Brinjal Fruit and Shoot Borer (Leucinodes orbonalis) and Fruit Borer (Helicoverpa armigera).
[15] The cause of Heart attack is:
A.
bacteria
B.
virus
C.
lack of blood supply to the heart
D.
impairment of heart's working due to unknown reason
Ans:
lack of blood supply to the heart
Explanation :
Heart attack is the death of a segment of heart muscle caused by the loss of blood supply. It occurs when the blood flow that brings oxygen to the heart muscle is severely reduced or cut off completely. The blood supply is usually lost because a coronary artery, one that supplies blood to the heart muscle, is blocked by a blood clot (coronary thrombosis).
[16] Tachycardia is a condition characterized by
A.
heart-rate decreases from the normal
B.
heart- rate increases from the normal
C.
heart-beat stops
D.
heart fails to pump
Ans:
heart- rate increases from the normal
Explanation :
Tachycardia is a heart rate that exceeds the normal resting rate. In general, a resting heart rate over 100 beats per minute is accepted as tachycardia in adults. A healthy adult heart normally beats 60 to 100 times a minute when a person is at rest. Tachycardia occurs when an abnormality in the heart produces rapid electrical signals.
[17] Ecosystem consists of :
A.
A biotic community and its non-living elements
B.
Population
C.
A population and its non-living elements
D.
A biotic community
Ans:
A biotic community and its non-living elements
Explanation :
An ecosystem is defined as any community of living and non-living things that work together. Biotic components are the living things that shape an eco-system. All non-living components of an ecosystem is called a biotic components such as temperature, light, moisture, air currents, etc.
[18] What are Lipids?
A.
Lipids are monosaccharide
B.
Lipids do not provide energy to cells
C.
Fruits are a good source of lipids
D.
Cholesterol and trans fatty acids are types of Lipids
Ans:
Cholesterol and trans fatty acids are types of Lipids
Explanation :
Lipids are a group of naturally occurring molecules that include fats, waxes, sterols, fat-soluble vitamins (such as vitamins A, D, E, and K), monoglycerides, diglycerides, triglycerides, phospholipids, and others. They encompass molecules such as fatty acids and their derivatives (including tri-, di-, monoglycerides, and phospholipids), as well as other sterol= containing metabolites such as cholesterol.
[19] Which of the following is least likely to be an effect of global warming?
A.
Increased frequency of hurricanes
B.
Loss of fertile delta region as for agriculture
C.
Decreased rate of photosynthesis in vegetation
D.
Shrinking of the polar ice regions
Ans:
Decreased rate of photosynthesis in vegetation
Explanation :
Global warming is the current increase in temperature of the Earth's surface (both land and water) as well as it's atmosphere. Climatologists believe that it will lead to extreme weather conditions such as increase in the frequency and strength of hurricanes, increase in sea level and submergence of deltaic regions due to melting of polar ice, coupled with melting ice sheets and glaciers across Greenland, North America, South America, Europe and Asia. However, the gradual heating of Earth's surface, oceans and atmosphere will not affect photosynthesis.
[20] Leaves of many grasses are capable of folding and unfolding because -
A.
their mesophyll is not differentiated into palisade and spongy parenchyma
B.
they have stomata on both sides of the leaf
C.
they have high levels of silica
D.
they have specialised bulliform cells
Ans:
they have specialised bulliform cells
Explanation :
Bulliform cells are large, bubble-shaped epidermal cells that occur in groups on the upper surface of the leaves of many grasses. These cells, by their turgor changes, cause rolling and unrolling of the leaves thus regulating water loss.
[21] Diamond does not conduct electricity, because -
A.
It's structure is very compact
B.
It is of crystalline nature
C.
There are only carbon atoms present in it
D.
No free electrons are present in it
Ans:
No free electrons are present in it
Explanation :
Diamond has a giant molecular structure. Each carbon atom is covalently bonded to four other carbon atoms. There are no free electrons or ions in diamond; so it does not conduct electricity. Except for most blue diamonds, which are semiconductors, diamonds are good electrical insulators.
[22] 'Gynecomastia' is -
A.
Development of hair on ears in males
B.
Increased height in females
C.
Development of an extra finger in females
D.
Development of breasts in males
Ans:
Development of breasts in males
Explanation :
Gynecomastia is swelling of the breast tissue in boys or men, caused by an imbalance of the hormones estrogen and testosterone. The development of gynecomastia is usually associated with benign pubertal change. Disturbances in the endocrine system that lead to an increase in the ratio of estrogens/androgens are thought to be responsible for the development of gynecomastia.
[23] Biofortifieation is a -
A.
method of breeding crops to increase their nutritional value
B.
strategy to combat unwanted nutrients in plants
C.
method of developing resistance to insect pests
D.
method of plant breeding for disease resistance
Ans:
method of breeding crops to increase their nutritional value
Explanation :
Biofortification is the breeding crops to increase their nutritional value. This can be done either through conventional selective breeding or genetic engineering. Biofortification differs from ordinary fortification because it focuses on making plant foods more nutritious as the plants are growing, rather than having nutrients added to the foods when they are being processed.
[24] Which of the following statements is true?
A.
Animals worry about raising their family
B.
Animals make several feeding trips in a day
C.
Animals often behave sensibly
D.
Animals do not know meaning of brotherhood
Ans:
Animals make several feeding trips in a day
Explanation :
Animal Kingdom is usually a short day; they take several feeding trips in a day. Big birds and antelope feed several times a day.
[25] If a healthy freshwater fish is placed in salt water, what will be the expected consequence?
A.
The fish becomes dehydrated and dies
B.
The fish becomes bloated and dies
C.
The fish suffers from fungal or bacterial disease and dies
D.
There is no observable effect on the fish provided there is sufficient food
Ans:
The fish becomes dehydrated and dies
Explanation :
When freshwater fish is placed in salt water, the water molecules contained in the fish's body would pass through the cell membranes of the fish, causing the fish to lose water by diffusion. This sudden change in the molecular makeup of the fish would cause the fish to die.
Explanation :
Dark fermentation is the fermentative conversion of organic substrate to bio-hydrogen. It is a complex process manifested by diverse groups of bacteria, involving a series of biochemical reactions using three steps similar to anaerobic conversion. Wastewater is used as a potential substrate for bio-hydrogen production in the dark fermentation process.
[8] Which of the following listed is not a feature of organic farming?
A.
The non-use of chemical fertilizers and pesticides
B.
Soil is nurtured for furture use by maintaining micro-organisms
C.
Use of synthetic fertilizers
D.
Very less energy consumption
Ans:
Use of synthetic fertilizers
Explanation :
Organic farming is a form of agriculture that relies on techniques such as crop rotation, green manure, compost, and biological pest control. It uses fertilizers and pesticides if they are considered natural (such as bone meal from animals or pyrethrin from flowers), but it excludes the use of synthetic petrochemical fertilizers and pesticides, plant growth regulators, etc.
[9] Which of the following series is true about energy flow in an ecosystem?
A.
Producers Decomposers Consumers
B.
Decomposers Consumers Producers
C.
Producers --> Consumers ----> Decomposers.
D.
Consumers --> Producers Decomposers.
Ans:
Producers --> Consumers ----> Decomposers.
Explanation :
0
[10] Rate of cooling depends on the -
A.
Temperature difference between the body and the surroundings
B.
Nature of the radiating surface
C.
Area of the radiating surface
D.
All of these
Ans:
All of these
Explanation :
Newton's Law of Cooling states that the rate of temperature of the body is proportional to the difference between the temperature of the body and that of the surrounding medium. When a body cools by radiation, then rate of cooling depends upon the following factors: • Nature of the radiating surface, that is, emissivity; • Area of the radiating surface; • Mass of the radiating surface; 10 Specific heat of the radiating body; • Temperature of radiating body and ♦ Temperature of the surrounding.
[11] What is the Kyoto Protocol?
A.
It is an agreement among countries to take steps for reducing acid rain
B.
It is an agreement among countries to take steps for planting trees to control pollution
C.
It is an agreement among countries to start using nuclear energy
D.
It is an agreement among countries to take steps for reducing global warming
Ans:
It is an agreement among countries to take steps for reducing global warming
Explanation :
The Kyoto Protocol is an international treaty, which extends the 1992 United Nations Framework Convention on Climate Change (UNFCCC) that commits State Parties to reduce greenhouse gases emissions, based on the premise that (1) global warming exists and (2) man-made CO2 emissions have caused it. -----------x----------
[12] The non-living characteristic of viruses is –
A.
ability to multiply only inside the host
B.
ability to cause diseases in the host
C.
ability to undergo mutation
D.
ability to be crystallise
Ans:
ability to be crystallise
Explanation :
Viruses are known as a connecting link between non-living and living being.
[13] What is silverfish?
A.
A silvery freshwater fish
B.
Leaf of silver oak
C.
A small silvery wingles insect
D.
An American fox with a silvery fur
Ans:
A small silvery wingles insect
Explanation :
A silverfish (Lepisma saccharina) is a small, wingless insect in the order Zygentoma (formerly Thysanura). Its common name derives from the animal's silvery light grey color, combined with the fish- like appearance of its movements.
[14] A genetically engineered form of brinjal known as the BT brinjal has been developed. The objective of this is -
A.
to make it pest resistant
B.
to improve its taste and nutritive value
C.
to make it drought resistant
D.
to make its shelflife longer
Ans:
to make it pest resistant
Explanation :
Bt Brinjal is a genetically modified (GM) crop created by inserting Cry1Ac gene from the soil bacterium Bacillus thuringiensis into Brinjal. The insertion of the gene gives Brinjal plant resistance against lepidopteron pets/insects like the Brinjal Fruit and Shoot Borer (Leucinodes orbonalis) and Fruit Borer (Helicoverpa armigera).
[15] The cause of Heart attack is:
A.
bacteria
B.
virus
C.
lack of blood supply to the heart
D.
impairment of heart's working due to unknown reason
Ans:
lack of blood supply to the heart
Explanation :
Heart attack is the death of a segment of heart muscle caused by the loss of blood supply. It occurs when the blood flow that brings oxygen to the heart muscle is severely reduced or cut off completely. The blood supply is usually lost because a coronary artery, one that supplies blood to the heart muscle, is blocked by a blood clot (coronary thrombosis).
[16] Tachycardia is a condition characterized by
A.
heart-rate decreases from the normal
B.
heart- rate increases from the normal
C.
heart-beat stops
D.
heart fails to pump
Ans:
heart- rate increases from the normal
Explanation :
Tachycardia is a heart rate that exceeds the normal resting rate. In general, a resting heart rate over 100 beats per minute is accepted as tachycardia in adults. A healthy adult heart normally beats 60 to 100 times a minute when a person is at rest. Tachycardia occurs when an abnormality in the heart produces rapid electrical signals.
[17] Ecosystem consists of :
A.
A biotic community and its non-living elements
B.
Population
C.
A population and its non-living elements
D.
A biotic community
Ans:
A biotic community and its non-living elements
Explanation :
An ecosystem is defined as any community of living and non-living things that work together. Biotic components are the living things that shape an eco-system. All non-living components of an ecosystem is called a biotic components such as temperature, light, moisture, air currents, etc.
[18] What are Lipids?
A.
Lipids are monosaccharide
B.
Lipids do not provide energy to cells
C.
Fruits are a good source of lipids
D.
Cholesterol and trans fatty acids are types of Lipids
Ans:
Cholesterol and trans fatty acids are types of Lipids
Explanation :
Lipids are a group of naturally occurring molecules that include fats, waxes, sterols, fat-soluble vitamins (such as vitamins A, D, E, and K), monoglycerides, diglycerides, triglycerides, phospholipids, and others. They encompass molecules such as fatty acids and their derivatives (including tri-, di-, monoglycerides, and phospholipids), as well as other sterol= containing metabolites such as cholesterol.
[19] Which of the following is least likely to be an effect of global warming?
A.
Increased frequency of hurricanes
B.
Loss of fertile delta region as for agriculture
C.
Decreased rate of photosynthesis in vegetation
D.
Shrinking of the polar ice regions
Ans:
Decreased rate of photosynthesis in vegetation
Explanation :
Global warming is the current increase in temperature of the Earth's surface (both land and water) as well as it's atmosphere. Climatologists believe that it will lead to extreme weather conditions such as increase in the frequency and strength of hurricanes, increase in sea level and submergence of deltaic regions due to melting of polar ice, coupled with melting ice sheets and glaciers across Greenland, North America, South America, Europe and Asia. However, the gradual heating of Earth's surface, oceans and atmosphere will not affect photosynthesis.
[20] Leaves of many grasses are capable of folding and unfolding because -
A.
their mesophyll is not differentiated into palisade and spongy parenchyma
B.
they have stomata on both sides of the leaf
C.
they have high levels of silica
D.
they have specialised bulliform cells
Ans:
they have specialised bulliform cells
Explanation :
Bulliform cells are large, bubble-shaped epidermal cells that occur in groups on the upper surface of the leaves of many grasses. These cells, by their turgor changes, cause rolling and unrolling of the leaves thus regulating water loss.
[21] Diamond does not conduct electricity, because -
A.
It's structure is very compact
B.
It is of crystalline nature
C.
There are only carbon atoms present in it
D.
No free electrons are present in it
Ans:
No free electrons are present in it
Explanation :
Diamond has a giant molecular structure. Each carbon atom is covalently bonded to four other carbon atoms. There are no free electrons or ions in diamond; so it does not conduct electricity. Except for most blue diamonds, which are semiconductors, diamonds are good electrical insulators.
[22] 'Gynecomastia' is -
A.
Development of hair on ears in males
B.
Increased height in females
C.
Development of an extra finger in females
D.
Development of breasts in males
Ans:
Development of breasts in males
Explanation :
Gynecomastia is swelling of the breast tissue in boys or men, caused by an imbalance of the hormones estrogen and testosterone. The development of gynecomastia is usually associated with benign pubertal change. Disturbances in the endocrine system that lead to an increase in the ratio of estrogens/androgens are thought to be responsible for the development of gynecomastia.
[23] Biofortifieation is a -
A.
method of breeding crops to increase their nutritional value
B.
strategy to combat unwanted nutrients in plants
C.
method of developing resistance to insect pests
D.
method of plant breeding for disease resistance
Ans:
method of breeding crops to increase their nutritional value
Explanation :
Biofortification is the breeding crops to increase their nutritional value. This can be done either through conventional selective breeding or genetic engineering. Biofortification differs from ordinary fortification because it focuses on making plant foods more nutritious as the plants are growing, rather than having nutrients added to the foods when they are being processed.
[24] Which of the following statements is true?
A.
Animals worry about raising their family
B.
Animals make several feeding trips in a day
C.
Animals often behave sensibly
D.
Animals do not know meaning of brotherhood
Ans:
Animals make several feeding trips in a day
Explanation :
Animal Kingdom is usually a short day; they take several feeding trips in a day. Big birds and antelope feed several times a day.
[25] If a healthy freshwater fish is placed in salt water, what will be the expected consequence?
A.
The fish becomes dehydrated and dies
B.
The fish becomes bloated and dies
C.
The fish suffers from fungal or bacterial disease and dies
D.
There is no observable effect on the fish provided there is sufficient food
Ans:
The fish becomes dehydrated and dies
Explanation :
When freshwater fish is placed in salt water, the water molecules contained in the fish's body would pass through the cell membranes of the fish, causing the fish to lose water by diffusion. This sudden change in the molecular makeup of the fish would cause the fish to die.
Explanation :
0
[10] Rate of cooling depends on the -
A.
Temperature difference between the body and the surroundings
B.
Nature of the radiating surface
C.
Area of the radiating surface
D.
All of these
Ans:
All of these
Explanation :
Newton's Law of Cooling states that the rate of temperature of the body is proportional to the difference between the temperature of the body and that of the surrounding medium. When a body cools by radiation, then rate of cooling depends upon the following factors: • Nature of the radiating surface, that is, emissivity; • Area of the radiating surface; • Mass of the radiating surface; 10 Specific heat of the radiating body; • Temperature of radiating body and ♦ Temperature of the surrounding.
[11] What is the Kyoto Protocol?
A.
It is an agreement among countries to take steps for reducing acid rain
B.
It is an agreement among countries to take steps for planting trees to control pollution
C.
It is an agreement among countries to start using nuclear energy
D.
It is an agreement among countries to take steps for reducing global warming
Ans:
It is an agreement among countries to take steps for reducing global warming
Explanation :
The Kyoto Protocol is an international treaty, which extends the 1992 United Nations Framework Convention on Climate Change (UNFCCC) that commits State Parties to reduce greenhouse gases emissions, based on the premise that (1) global warming exists and (2) man-made CO2 emissions have caused it. -----------x----------
[12] The non-living characteristic of viruses is –
A.
ability to multiply only inside the host
B.
ability to cause diseases in the host
C.
ability to undergo mutation
D.
ability to be crystallise
Ans:
ability to be crystallise
Explanation :
Viruses are known as a connecting link between non-living and living being.
[13] What is silverfish?
A.
A silvery freshwater fish
B.
Leaf of silver oak
C.
A small silvery wingles insect
D.
An American fox with a silvery fur
Ans:
A small silvery wingles insect
Explanation :
A silverfish (Lepisma saccharina) is a small, wingless insect in the order Zygentoma (formerly Thysanura). Its common name derives from the animal's silvery light grey color, combined with the fish- like appearance of its movements.
[14] A genetically engineered form of brinjal known as the BT brinjal has been developed. The objective of this is -
A.
to make it pest resistant
B.
to improve its taste and nutritive value
C.
to make it drought resistant
D.
to make its shelflife longer
Ans:
to make it pest resistant
Explanation :
Bt Brinjal is a genetically modified (GM) crop created by inserting Cry1Ac gene from the soil bacterium Bacillus thuringiensis into Brinjal. The insertion of the gene gives Brinjal plant resistance against lepidopteron pets/insects like the Brinjal Fruit and Shoot Borer (Leucinodes orbonalis) and Fruit Borer (Helicoverpa armigera).
[15] The cause of Heart attack is:
A.
bacteria
B.
virus
C.
lack of blood supply to the heart
D.
impairment of heart's working due to unknown reason
Ans:
lack of blood supply to the heart
Explanation :
Heart attack is the death of a segment of heart muscle caused by the loss of blood supply. It occurs when the blood flow that brings oxygen to the heart muscle is severely reduced or cut off completely. The blood supply is usually lost because a coronary artery, one that supplies blood to the heart muscle, is blocked by a blood clot (coronary thrombosis).
[16] Tachycardia is a condition characterized by
A.
heart-rate decreases from the normal
B.
heart- rate increases from the normal
C.
heart-beat stops
D.
heart fails to pump
Ans:
heart- rate increases from the normal
Explanation :
Tachycardia is a heart rate that exceeds the normal resting rate. In general, a resting heart rate over 100 beats per minute is accepted as tachycardia in adults. A healthy adult heart normally beats 60 to 100 times a minute when a person is at rest. Tachycardia occurs when an abnormality in the heart produces rapid electrical signals.
[17] Ecosystem consists of :
A.
A biotic community and its non-living elements
B.
Population
C.
A population and its non-living elements
D.
A biotic community
Ans:
A biotic community and its non-living elements
Explanation :
An ecosystem is defined as any community of living and non-living things that work together. Biotic components are the living things that shape an eco-system. All non-living components of an ecosystem is called a biotic components such as temperature, light, moisture, air currents, etc.
[18] What are Lipids?
A.
Lipids are monosaccharide
B.
Lipids do not provide energy to cells
C.
Fruits are a good source of lipids
D.
Cholesterol and trans fatty acids are types of Lipids
Ans:
Cholesterol and trans fatty acids are types of Lipids
Explanation :
Lipids are a group of naturally occurring molecules that include fats, waxes, sterols, fat-soluble vitamins (such as vitamins A, D, E, and K), monoglycerides, diglycerides, triglycerides, phospholipids, and others. They encompass molecules such as fatty acids and their derivatives (including tri-, di-, monoglycerides, and phospholipids), as well as other sterol= containing metabolites such as cholesterol.
[19] Which of the following is least likely to be an effect of global warming?
A.
Increased frequency of hurricanes
B.
Loss of fertile delta region as for agriculture
C.
Decreased rate of photosynthesis in vegetation
D.
Shrinking of the polar ice regions
Ans:
Decreased rate of photosynthesis in vegetation
Explanation :
Global warming is the current increase in temperature of the Earth's surface (both land and water) as well as it's atmosphere. Climatologists believe that it will lead to extreme weather conditions such as increase in the frequency and strength of hurricanes, increase in sea level and submergence of deltaic regions due to melting of polar ice, coupled with melting ice sheets and glaciers across Greenland, North America, South America, Europe and Asia. However, the gradual heating of Earth's surface, oceans and atmosphere will not affect photosynthesis.
[20] Leaves of many grasses are capable of folding and unfolding because -
A.
their mesophyll is not differentiated into palisade and spongy parenchyma
B.
they have stomata on both sides of the leaf
C.
they have high levels of silica
D.
they have specialised bulliform cells
Ans:
they have specialised bulliform cells
Explanation :
Bulliform cells are large, bubble-shaped epidermal cells that occur in groups on the upper surface of the leaves of many grasses. These cells, by their turgor changes, cause rolling and unrolling of the leaves thus regulating water loss.
[21] Diamond does not conduct electricity, because -
A.
It's structure is very compact
B.
It is of crystalline nature
C.
There are only carbon atoms present in it
D.
No free electrons are present in it
Ans:
No free electrons are present in it
Explanation :
Diamond has a giant molecular structure. Each carbon atom is covalently bonded to four other carbon atoms. There are no free electrons or ions in diamond; so it does not conduct electricity. Except for most blue diamonds, which are semiconductors, diamonds are good electrical insulators.
[22] 'Gynecomastia' is -
A.
Development of hair on ears in males
B.
Increased height in females
C.
Development of an extra finger in females
D.
Development of breasts in males
Ans:
Development of breasts in males
Explanation :
Gynecomastia is swelling of the breast tissue in boys or men, caused by an imbalance of the hormones estrogen and testosterone. The development of gynecomastia is usually associated with benign pubertal change. Disturbances in the endocrine system that lead to an increase in the ratio of estrogens/androgens are thought to be responsible for the development of gynecomastia.
[23] Biofortifieation is a -
A.
method of breeding crops to increase their nutritional value
B.
strategy to combat unwanted nutrients in plants
C.
method of developing resistance to insect pests
D.
method of plant breeding for disease resistance
Ans:
method of breeding crops to increase their nutritional value
Explanation :
Biofortification is the breeding crops to increase their nutritional value. This can be done either through conventional selective breeding or genetic engineering. Biofortification differs from ordinary fortification because it focuses on making plant foods more nutritious as the plants are growing, rather than having nutrients added to the foods when they are being processed.
[24] Which of the following statements is true?
A.
Animals worry about raising their family
B.
Animals make several feeding trips in a day
C.
Animals often behave sensibly
D.
Animals do not know meaning of brotherhood
Ans:
Animals make several feeding trips in a day
Explanation :
Animal Kingdom is usually a short day; they take several feeding trips in a day. Big birds and antelope feed several times a day.
[25] If a healthy freshwater fish is placed in salt water, what will be the expected consequence?
A.
The fish becomes dehydrated and dies
B.
The fish becomes bloated and dies
C.
The fish suffers from fungal or bacterial disease and dies
D.
There is no observable effect on the fish provided there is sufficient food
Ans:
The fish becomes dehydrated and dies
Explanation :
When freshwater fish is placed in salt water, the water molecules contained in the fish's body would pass through the cell membranes of the fish, causing the fish to lose water by diffusion. This sudden change in the molecular makeup of the fish would cause the fish to die.
Explanation :
The Kyoto Protocol is an international treaty, which extends the 1992 United Nations Framework Convention on Climate Change (UNFCCC) that commits State Parties to reduce greenhouse gases emissions, based on the premise that (1) global warming exists and (2) man-made CO2 emissions have caused it. -----------x----------
[12] The non-living characteristic of viruses is –
A.
ability to multiply only inside the host
B.
ability to cause diseases in the host
C.
ability to undergo mutation
D.
ability to be crystallise
Ans:
ability to be crystallise
Explanation :
Viruses are known as a connecting link between non-living and living being.
[13] What is silverfish?
A.
A silvery freshwater fish
B.
Leaf of silver oak
C.
A small silvery wingles insect
D.
An American fox with a silvery fur
Ans:
A small silvery wingles insect
Explanation :
A silverfish (Lepisma saccharina) is a small, wingless insect in the order Zygentoma (formerly Thysanura). Its common name derives from the animal's silvery light grey color, combined with the fish- like appearance of its movements.
[14] A genetically engineered form of brinjal known as the BT brinjal has been developed. The objective of this is -
A.
to make it pest resistant
B.
to improve its taste and nutritive value
C.
to make it drought resistant
D.
to make its shelflife longer
Ans:
to make it pest resistant
Explanation :
Bt Brinjal is a genetically modified (GM) crop created by inserting Cry1Ac gene from the soil bacterium Bacillus thuringiensis into Brinjal. The insertion of the gene gives Brinjal plant resistance against lepidopteron pets/insects like the Brinjal Fruit and Shoot Borer (Leucinodes orbonalis) and Fruit Borer (Helicoverpa armigera).
[15] The cause of Heart attack is:
A.
bacteria
B.
virus
C.
lack of blood supply to the heart
D.
impairment of heart's working due to unknown reason
Ans:
lack of blood supply to the heart
Explanation :
Heart attack is the death of a segment of heart muscle caused by the loss of blood supply. It occurs when the blood flow that brings oxygen to the heart muscle is severely reduced or cut off completely. The blood supply is usually lost because a coronary artery, one that supplies blood to the heart muscle, is blocked by a blood clot (coronary thrombosis).
[16] Tachycardia is a condition characterized by
A.
heart-rate decreases from the normal
B.
heart- rate increases from the normal
C.
heart-beat stops
D.
heart fails to pump
Ans:
heart- rate increases from the normal
Explanation :
Tachycardia is a heart rate that exceeds the normal resting rate. In general, a resting heart rate over 100 beats per minute is accepted as tachycardia in adults. A healthy adult heart normally beats 60 to 100 times a minute when a person is at rest. Tachycardia occurs when an abnormality in the heart produces rapid electrical signals.
[17] Ecosystem consists of :
A.
A biotic community and its non-living elements
B.
Population
C.
A population and its non-living elements
D.
A biotic community
Ans:
A biotic community and its non-living elements
Explanation :
An ecosystem is defined as any community of living and non-living things that work together. Biotic components are the living things that shape an eco-system. All non-living components of an ecosystem is called a biotic components such as temperature, light, moisture, air currents, etc.
[18] What are Lipids?
A.
Lipids are monosaccharide
B.
Lipids do not provide energy to cells
C.
Fruits are a good source of lipids
D.
Cholesterol and trans fatty acids are types of Lipids
Ans:
Cholesterol and trans fatty acids are types of Lipids
Explanation :
Lipids are a group of naturally occurring molecules that include fats, waxes, sterols, fat-soluble vitamins (such as vitamins A, D, E, and K), monoglycerides, diglycerides, triglycerides, phospholipids, and others. They encompass molecules such as fatty acids and their derivatives (including tri-, di-, monoglycerides, and phospholipids), as well as other sterol= containing metabolites such as cholesterol.
[19] Which of the following is least likely to be an effect of global warming?
A.
Increased frequency of hurricanes
B.
Loss of fertile delta region as for agriculture
C.
Decreased rate of photosynthesis in vegetation
D.
Shrinking of the polar ice regions
Ans:
Decreased rate of photosynthesis in vegetation
Explanation :
Global warming is the current increase in temperature of the Earth's surface (both land and water) as well as it's atmosphere. Climatologists believe that it will lead to extreme weather conditions such as increase in the frequency and strength of hurricanes, increase in sea level and submergence of deltaic regions due to melting of polar ice, coupled with melting ice sheets and glaciers across Greenland, North America, South America, Europe and Asia. However, the gradual heating of Earth's surface, oceans and atmosphere will not affect photosynthesis.
[20] Leaves of many grasses are capable of folding and unfolding because -
A.
their mesophyll is not differentiated into palisade and spongy parenchyma
B.
they have stomata on both sides of the leaf
C.
they have high levels of silica
D.
they have specialised bulliform cells
Ans:
they have specialised bulliform cells
Explanation :
Bulliform cells are large, bubble-shaped epidermal cells that occur in groups on the upper surface of the leaves of many grasses. These cells, by their turgor changes, cause rolling and unrolling of the leaves thus regulating water loss.
[21] Diamond does not conduct electricity, because -
A.
It's structure is very compact
B.
It is of crystalline nature
C.
There are only carbon atoms present in it
D.
No free electrons are present in it
Ans:
No free electrons are present in it
Explanation :
Diamond has a giant molecular structure. Each carbon atom is covalently bonded to four other carbon atoms. There are no free electrons or ions in diamond; so it does not conduct electricity. Except for most blue diamonds, which are semiconductors, diamonds are good electrical insulators.
[22] 'Gynecomastia' is -
A.
Development of hair on ears in males
B.
Increased height in females
C.
Development of an extra finger in females
D.
Development of breasts in males
Ans:
Development of breasts in males
Explanation :
Gynecomastia is swelling of the breast tissue in boys or men, caused by an imbalance of the hormones estrogen and testosterone. The development of gynecomastia is usually associated with benign pubertal change. Disturbances in the endocrine system that lead to an increase in the ratio of estrogens/androgens are thought to be responsible for the development of gynecomastia.
[23] Biofortifieation is a -
A.
method of breeding crops to increase their nutritional value
B.
strategy to combat unwanted nutrients in plants
C.
method of developing resistance to insect pests
D.
method of plant breeding for disease resistance
Ans:
method of breeding crops to increase their nutritional value
Explanation :
Biofortification is the breeding crops to increase their nutritional value. This can be done either through conventional selective breeding or genetic engineering. Biofortification differs from ordinary fortification because it focuses on making plant foods more nutritious as the plants are growing, rather than having nutrients added to the foods when they are being processed.
[24] Which of the following statements is true?
A.
Animals worry about raising their family
B.
Animals make several feeding trips in a day
C.
Animals often behave sensibly
D.
Animals do not know meaning of brotherhood
Ans:
Animals make several feeding trips in a day
Explanation :
Animal Kingdom is usually a short day; they take several feeding trips in a day. Big birds and antelope feed several times a day.
[25] If a healthy freshwater fish is placed in salt water, what will be the expected consequence?
A.
The fish becomes dehydrated and dies
B.
The fish becomes bloated and dies
C.
The fish suffers from fungal or bacterial disease and dies
D.
There is no observable effect on the fish provided there is sufficient food
Ans:
The fish becomes dehydrated and dies
Explanation :
When freshwater fish is placed in salt water, the water molecules contained in the fish's body would pass through the cell membranes of the fish, causing the fish to lose water by diffusion. This sudden change in the molecular makeup of the fish would cause the fish to die.
Explanation :
A silverfish (Lepisma saccharina) is a small, wingless insect in the order Zygentoma (formerly Thysanura). Its common name derives from the animal's silvery light grey color, combined with the fish- like appearance of its movements.
[14] A genetically engineered form of brinjal known as the BT brinjal has been developed. The objective of this is -
A.
to make it pest resistant
B.
to improve its taste and nutritive value
C.
to make it drought resistant
D.
to make its shelflife longer
Ans:
to make it pest resistant
Explanation :
Bt Brinjal is a genetically modified (GM) crop created by inserting Cry1Ac gene from the soil bacterium Bacillus thuringiensis into Brinjal. The insertion of the gene gives Brinjal plant resistance against lepidopteron pets/insects like the Brinjal Fruit and Shoot Borer (Leucinodes orbonalis) and Fruit Borer (Helicoverpa armigera).
[15] The cause of Heart attack is:
A.
bacteria
B.
virus
C.
lack of blood supply to the heart
D.
impairment of heart's working due to unknown reason
Ans:
lack of blood supply to the heart
Explanation :
Heart attack is the death of a segment of heart muscle caused by the loss of blood supply. It occurs when the blood flow that brings oxygen to the heart muscle is severely reduced or cut off completely. The blood supply is usually lost because a coronary artery, one that supplies blood to the heart muscle, is blocked by a blood clot (coronary thrombosis).
[16] Tachycardia is a condition characterized by
A.
heart-rate decreases from the normal
B.
heart- rate increases from the normal
C.
heart-beat stops
D.
heart fails to pump
Ans:
heart- rate increases from the normal
Explanation :
Tachycardia is a heart rate that exceeds the normal resting rate. In general, a resting heart rate over 100 beats per minute is accepted as tachycardia in adults. A healthy adult heart normally beats 60 to 100 times a minute when a person is at rest. Tachycardia occurs when an abnormality in the heart produces rapid electrical signals.
[17] Ecosystem consists of :
A.
A biotic community and its non-living elements
B.
Population
C.
A population and its non-living elements
D.
A biotic community
Ans:
A biotic community and its non-living elements
Explanation :
An ecosystem is defined as any community of living and non-living things that work together. Biotic components are the living things that shape an eco-system. All non-living components of an ecosystem is called a biotic components such as temperature, light, moisture, air currents, etc.
[18] What are Lipids?
A.
Lipids are monosaccharide
B.
Lipids do not provide energy to cells
C.
Fruits are a good source of lipids
D.
Cholesterol and trans fatty acids are types of Lipids
Ans:
Cholesterol and trans fatty acids are types of Lipids
Explanation :
Lipids are a group of naturally occurring molecules that include fats, waxes, sterols, fat-soluble vitamins (such as vitamins A, D, E, and K), monoglycerides, diglycerides, triglycerides, phospholipids, and others. They encompass molecules such as fatty acids and their derivatives (including tri-, di-, monoglycerides, and phospholipids), as well as other sterol= containing metabolites such as cholesterol.
[19] Which of the following is least likely to be an effect of global warming?
A.
Increased frequency of hurricanes
B.
Loss of fertile delta region as for agriculture
C.
Decreased rate of photosynthesis in vegetation
D.
Shrinking of the polar ice regions
Ans:
Decreased rate of photosynthesis in vegetation
Explanation :
Global warming is the current increase in temperature of the Earth's surface (both land and water) as well as it's atmosphere. Climatologists believe that it will lead to extreme weather conditions such as increase in the frequency and strength of hurricanes, increase in sea level and submergence of deltaic regions due to melting of polar ice, coupled with melting ice sheets and glaciers across Greenland, North America, South America, Europe and Asia. However, the gradual heating of Earth's surface, oceans and atmosphere will not affect photosynthesis.
[20] Leaves of many grasses are capable of folding and unfolding because -
A.
their mesophyll is not differentiated into palisade and spongy parenchyma
B.
they have stomata on both sides of the leaf
C.
they have high levels of silica
D.
they have specialised bulliform cells
Ans:
they have specialised bulliform cells
Explanation :
Bulliform cells are large, bubble-shaped epidermal cells that occur in groups on the upper surface of the leaves of many grasses. These cells, by their turgor changes, cause rolling and unrolling of the leaves thus regulating water loss.
[21] Diamond does not conduct electricity, because -
A.
It's structure is very compact
B.
It is of crystalline nature
C.
There are only carbon atoms present in it
D.
No free electrons are present in it
Ans:
No free electrons are present in it
Explanation :
Diamond has a giant molecular structure. Each carbon atom is covalently bonded to four other carbon atoms. There are no free electrons or ions in diamond; so it does not conduct electricity. Except for most blue diamonds, which are semiconductors, diamonds are good electrical insulators.
[22] 'Gynecomastia' is -
A.
Development of hair on ears in males
B.
Increased height in females
C.
Development of an extra finger in females
D.
Development of breasts in males
Ans:
Development of breasts in males
Explanation :
Gynecomastia is swelling of the breast tissue in boys or men, caused by an imbalance of the hormones estrogen and testosterone. The development of gynecomastia is usually associated with benign pubertal change. Disturbances in the endocrine system that lead to an increase in the ratio of estrogens/androgens are thought to be responsible for the development of gynecomastia.
[23] Biofortifieation is a -
A.
method of breeding crops to increase their nutritional value
B.
strategy to combat unwanted nutrients in plants
C.
method of developing resistance to insect pests
D.
method of plant breeding for disease resistance
Ans:
method of breeding crops to increase their nutritional value
Explanation :
Biofortification is the breeding crops to increase their nutritional value. This can be done either through conventional selective breeding or genetic engineering. Biofortification differs from ordinary fortification because it focuses on making plant foods more nutritious as the plants are growing, rather than having nutrients added to the foods when they are being processed.
[24] Which of the following statements is true?
A.
Animals worry about raising their family
B.
Animals make several feeding trips in a day
C.
Animals often behave sensibly
D.
Animals do not know meaning of brotherhood
Ans:
Animals make several feeding trips in a day
Explanation :
Animal Kingdom is usually a short day; they take several feeding trips in a day. Big birds and antelope feed several times a day.
[25] If a healthy freshwater fish is placed in salt water, what will be the expected consequence?
A.
The fish becomes dehydrated and dies
B.
The fish becomes bloated and dies
C.
The fish suffers from fungal or bacterial disease and dies
D.
There is no observable effect on the fish provided there is sufficient food
Ans:
The fish becomes dehydrated and dies
Explanation :
When freshwater fish is placed in salt water, the water molecules contained in the fish's body would pass through the cell membranes of the fish, causing the fish to lose water by diffusion. This sudden change in the molecular makeup of the fish would cause the fish to die.
Explanation :
Heart attack is the death of a segment of heart muscle caused by the loss of blood supply. It occurs when the blood flow that brings oxygen to the heart muscle is severely reduced or cut off completely. The blood supply is usually lost because a coronary artery, one that supplies blood to the heart muscle, is blocked by a blood clot (coronary thrombosis).
[16] Tachycardia is a condition characterized by
A.
heart-rate decreases from the normal
B.
heart- rate increases from the normal
C.
heart-beat stops
D.
heart fails to pump
Ans:
heart- rate increases from the normal
Explanation :
Tachycardia is a heart rate that exceeds the normal resting rate. In general, a resting heart rate over 100 beats per minute is accepted as tachycardia in adults. A healthy adult heart normally beats 60 to 100 times a minute when a person is at rest. Tachycardia occurs when an abnormality in the heart produces rapid electrical signals.
[17] Ecosystem consists of :
A.
A biotic community and its non-living elements
B.
Population
C.
A population and its non-living elements
D.
A biotic community
Ans:
A biotic community and its non-living elements
Explanation :
An ecosystem is defined as any community of living and non-living things that work together. Biotic components are the living things that shape an eco-system. All non-living components of an ecosystem is called a biotic components such as temperature, light, moisture, air currents, etc.
[18] What are Lipids?
A.
Lipids are monosaccharide
B.
Lipids do not provide energy to cells
C.
Fruits are a good source of lipids
D.
Cholesterol and trans fatty acids are types of Lipids
Ans:
Cholesterol and trans fatty acids are types of Lipids
Explanation :
Lipids are a group of naturally occurring molecules that include fats, waxes, sterols, fat-soluble vitamins (such as vitamins A, D, E, and K), monoglycerides, diglycerides, triglycerides, phospholipids, and others. They encompass molecules such as fatty acids and their derivatives (including tri-, di-, monoglycerides, and phospholipids), as well as other sterol= containing metabolites such as cholesterol.
[19] Which of the following is least likely to be an effect of global warming?
A.
Increased frequency of hurricanes
B.
Loss of fertile delta region as for agriculture
C.
Decreased rate of photosynthesis in vegetation
D.
Shrinking of the polar ice regions
Ans:
Decreased rate of photosynthesis in vegetation
Explanation :
Global warming is the current increase in temperature of the Earth's surface (both land and water) as well as it's atmosphere. Climatologists believe that it will lead to extreme weather conditions such as increase in the frequency and strength of hurricanes, increase in sea level and submergence of deltaic regions due to melting of polar ice, coupled with melting ice sheets and glaciers across Greenland, North America, South America, Europe and Asia. However, the gradual heating of Earth's surface, oceans and atmosphere will not affect photosynthesis.
[20] Leaves of many grasses are capable of folding and unfolding because -
A.
their mesophyll is not differentiated into palisade and spongy parenchyma
B.
they have stomata on both sides of the leaf
C.
they have high levels of silica
D.
they have specialised bulliform cells
Ans:
they have specialised bulliform cells
Explanation :
Bulliform cells are large, bubble-shaped epidermal cells that occur in groups on the upper surface of the leaves of many grasses. These cells, by their turgor changes, cause rolling and unrolling of the leaves thus regulating water loss.
[21] Diamond does not conduct electricity, because -
A.
It's structure is very compact
B.
It is of crystalline nature
C.
There are only carbon atoms present in it
D.
No free electrons are present in it
Ans:
No free electrons are present in it
Explanation :
Diamond has a giant molecular structure. Each carbon atom is covalently bonded to four other carbon atoms. There are no free electrons or ions in diamond; so it does not conduct electricity. Except for most blue diamonds, which are semiconductors, diamonds are good electrical insulators.
[22] 'Gynecomastia' is -
A.
Development of hair on ears in males
B.
Increased height in females
C.
Development of an extra finger in females
D.
Development of breasts in males
Ans:
Development of breasts in males
Explanation :
Gynecomastia is swelling of the breast tissue in boys or men, caused by an imbalance of the hormones estrogen and testosterone. The development of gynecomastia is usually associated with benign pubertal change. Disturbances in the endocrine system that lead to an increase in the ratio of estrogens/androgens are thought to be responsible for the development of gynecomastia.
[23] Biofortifieation is a -
A.
method of breeding crops to increase their nutritional value
B.
strategy to combat unwanted nutrients in plants
C.
method of developing resistance to insect pests
D.
method of plant breeding for disease resistance
Ans:
method of breeding crops to increase their nutritional value
Explanation :
Biofortification is the breeding crops to increase their nutritional value. This can be done either through conventional selective breeding or genetic engineering. Biofortification differs from ordinary fortification because it focuses on making plant foods more nutritious as the plants are growing, rather than having nutrients added to the foods when they are being processed.
[24] Which of the following statements is true?
A.
Animals worry about raising their family
B.
Animals make several feeding trips in a day
C.
Animals often behave sensibly
D.
Animals do not know meaning of brotherhood
Ans:
Animals make several feeding trips in a day
Explanation :
Animal Kingdom is usually a short day; they take several feeding trips in a day. Big birds and antelope feed several times a day.
[25] If a healthy freshwater fish is placed in salt water, what will be the expected consequence?
A.
The fish becomes dehydrated and dies
B.
The fish becomes bloated and dies
C.
The fish suffers from fungal or bacterial disease and dies
D.
There is no observable effect on the fish provided there is sufficient food
Ans:
The fish becomes dehydrated and dies
Explanation :
When freshwater fish is placed in salt water, the water molecules contained in the fish's body would pass through the cell membranes of the fish, causing the fish to lose water by diffusion. This sudden change in the molecular makeup of the fish would cause the fish to die.
Explanation :
An ecosystem is defined as any community of living and non-living things that work together. Biotic components are the living things that shape an eco-system. All non-living components of an ecosystem is called a biotic components such as temperature, light, moisture, air currents, etc.
[18] What are Lipids?
A.
Lipids are monosaccharide
B.
Lipids do not provide energy to cells
C.
Fruits are a good source of lipids
D.
Cholesterol and trans fatty acids are types of Lipids
Ans:
Cholesterol and trans fatty acids are types of Lipids
Explanation :
Lipids are a group of naturally occurring molecules that include fats, waxes, sterols, fat-soluble vitamins (such as vitamins A, D, E, and K), monoglycerides, diglycerides, triglycerides, phospholipids, and others. They encompass molecules such as fatty acids and their derivatives (including tri-, di-, monoglycerides, and phospholipids), as well as other sterol= containing metabolites such as cholesterol.
[19] Which of the following is least likely to be an effect of global warming?
A.
Increased frequency of hurricanes
B.
Loss of fertile delta region as for agriculture
C.
Decreased rate of photosynthesis in vegetation
D.
Shrinking of the polar ice regions
Ans:
Decreased rate of photosynthesis in vegetation
Explanation :
Global warming is the current increase in temperature of the Earth's surface (both land and water) as well as it's atmosphere. Climatologists believe that it will lead to extreme weather conditions such as increase in the frequency and strength of hurricanes, increase in sea level and submergence of deltaic regions due to melting of polar ice, coupled with melting ice sheets and glaciers across Greenland, North America, South America, Europe and Asia. However, the gradual heating of Earth's surface, oceans and atmosphere will not affect photosynthesis.
[20] Leaves of many grasses are capable of folding and unfolding because -
A.
their mesophyll is not differentiated into palisade and spongy parenchyma
B.
they have stomata on both sides of the leaf
C.
they have high levels of silica
D.
they have specialised bulliform cells
Ans:
they have specialised bulliform cells
Explanation :
Bulliform cells are large, bubble-shaped epidermal cells that occur in groups on the upper surface of the leaves of many grasses. These cells, by their turgor changes, cause rolling and unrolling of the leaves thus regulating water loss.
[21] Diamond does not conduct electricity, because -
A.
It's structure is very compact
B.
It is of crystalline nature
C.
There are only carbon atoms present in it
D.
No free electrons are present in it
Ans:
No free electrons are present in it
Explanation :
Diamond has a giant molecular structure. Each carbon atom is covalently bonded to four other carbon atoms. There are no free electrons or ions in diamond; so it does not conduct electricity. Except for most blue diamonds, which are semiconductors, diamonds are good electrical insulators.
[22] 'Gynecomastia' is -
A.
Development of hair on ears in males
B.
Increased height in females
C.
Development of an extra finger in females
D.
Development of breasts in males
Ans:
Development of breasts in males
Explanation :
Gynecomastia is swelling of the breast tissue in boys or men, caused by an imbalance of the hormones estrogen and testosterone. The development of gynecomastia is usually associated with benign pubertal change. Disturbances in the endocrine system that lead to an increase in the ratio of estrogens/androgens are thought to be responsible for the development of gynecomastia.
[23] Biofortifieation is a -
A.
method of breeding crops to increase their nutritional value
B.
strategy to combat unwanted nutrients in plants
C.
method of developing resistance to insect pests
D.
method of plant breeding for disease resistance
Ans:
method of breeding crops to increase their nutritional value
Explanation :
Biofortification is the breeding crops to increase their nutritional value. This can be done either through conventional selective breeding or genetic engineering. Biofortification differs from ordinary fortification because it focuses on making plant foods more nutritious as the plants are growing, rather than having nutrients added to the foods when they are being processed.
[24] Which of the following statements is true?
A.
Animals worry about raising their family
B.
Animals make several feeding trips in a day
C.
Animals often behave sensibly
D.
Animals do not know meaning of brotherhood
Ans:
Animals make several feeding trips in a day
Explanation :
Animal Kingdom is usually a short day; they take several feeding trips in a day. Big birds and antelope feed several times a day.
[25] If a healthy freshwater fish is placed in salt water, what will be the expected consequence?
A.
The fish becomes dehydrated and dies
B.
The fish becomes bloated and dies
C.
The fish suffers from fungal or bacterial disease and dies
D.
There is no observable effect on the fish provided there is sufficient food
Ans:
The fish becomes dehydrated and dies
Explanation :
When freshwater fish is placed in salt water, the water molecules contained in the fish's body would pass through the cell membranes of the fish, causing the fish to lose water by diffusion. This sudden change in the molecular makeup of the fish would cause the fish to die.
Explanation :
Global warming is the current increase in temperature of the Earth's surface (both land and water) as well as it's atmosphere. Climatologists believe that it will lead to extreme weather conditions such as increase in the frequency and strength of hurricanes, increase in sea level and submergence of deltaic regions due to melting of polar ice, coupled with melting ice sheets and glaciers across Greenland, North America, South America, Europe and Asia. However, the gradual heating of Earth's surface, oceans and atmosphere will not affect photosynthesis.
[20] Leaves of many grasses are capable of folding and unfolding because -
A.
their mesophyll is not differentiated into palisade and spongy parenchyma
B.
they have stomata on both sides of the leaf
C.
they have high levels of silica
D.
they have specialised bulliform cells
Ans:
they have specialised bulliform cells
Explanation :
Bulliform cells are large, bubble-shaped epidermal cells that occur in groups on the upper surface of the leaves of many grasses. These cells, by their turgor changes, cause rolling and unrolling of the leaves thus regulating water loss.
[21] Diamond does not conduct electricity, because -
A.
It's structure is very compact
B.
It is of crystalline nature
C.
There are only carbon atoms present in it
D.
No free electrons are present in it
Ans:
No free electrons are present in it
Explanation :
Diamond has a giant molecular structure. Each carbon atom is covalently bonded to four other carbon atoms. There are no free electrons or ions in diamond; so it does not conduct electricity. Except for most blue diamonds, which are semiconductors, diamonds are good electrical insulators.
[22] 'Gynecomastia' is -
A.
Development of hair on ears in males
B.
Increased height in females
C.
Development of an extra finger in females
D.
Development of breasts in males
Ans:
Development of breasts in males
Explanation :
Gynecomastia is swelling of the breast tissue in boys or men, caused by an imbalance of the hormones estrogen and testosterone. The development of gynecomastia is usually associated with benign pubertal change. Disturbances in the endocrine system that lead to an increase in the ratio of estrogens/androgens are thought to be responsible for the development of gynecomastia.
[23] Biofortifieation is a -
A.
method of breeding crops to increase their nutritional value
B.
strategy to combat unwanted nutrients in plants
C.
method of developing resistance to insect pests
D.
method of plant breeding for disease resistance
Ans:
method of breeding crops to increase their nutritional value
Explanation :
Biofortification is the breeding crops to increase their nutritional value. This can be done either through conventional selective breeding or genetic engineering. Biofortification differs from ordinary fortification because it focuses on making plant foods more nutritious as the plants are growing, rather than having nutrients added to the foods when they are being processed.
[24] Which of the following statements is true?
A.
Animals worry about raising their family
B.
Animals make several feeding trips in a day
C.
Animals often behave sensibly
D.
Animals do not know meaning of brotherhood
Ans:
Animals make several feeding trips in a day
Explanation :
Animal Kingdom is usually a short day; they take several feeding trips in a day. Big birds and antelope feed several times a day.
[25] If a healthy freshwater fish is placed in salt water, what will be the expected consequence?
A.
The fish becomes dehydrated and dies
B.
The fish becomes bloated and dies
C.
The fish suffers from fungal or bacterial disease and dies
D.
There is no observable effect on the fish provided there is sufficient food
Ans:
The fish becomes dehydrated and dies
Explanation :
When freshwater fish is placed in salt water, the water molecules contained in the fish's body would pass through the cell membranes of the fish, causing the fish to lose water by diffusion. This sudden change in the molecular makeup of the fish would cause the fish to die.
Explanation :
Diamond has a giant molecular structure. Each carbon atom is covalently bonded to four other carbon atoms. There are no free electrons or ions in diamond; so it does not conduct electricity. Except for most blue diamonds, which are semiconductors, diamonds are good electrical insulators.
[22] 'Gynecomastia' is -
A.
Development of hair on ears in males
B.
Increased height in females
C.
Development of an extra finger in females
D.
Development of breasts in males
Ans:
Development of breasts in males
Explanation :
Gynecomastia is swelling of the breast tissue in boys or men, caused by an imbalance of the hormones estrogen and testosterone. The development of gynecomastia is usually associated with benign pubertal change. Disturbances in the endocrine system that lead to an increase in the ratio of estrogens/androgens are thought to be responsible for the development of gynecomastia.
[23] Biofortifieation is a -
A.
method of breeding crops to increase their nutritional value
B.
strategy to combat unwanted nutrients in plants
C.
method of developing resistance to insect pests
D.
method of plant breeding for disease resistance
Ans:
method of breeding crops to increase their nutritional value
Explanation :
Biofortification is the breeding crops to increase their nutritional value. This can be done either through conventional selective breeding or genetic engineering. Biofortification differs from ordinary fortification because it focuses on making plant foods more nutritious as the plants are growing, rather than having nutrients added to the foods when they are being processed.
[24] Which of the following statements is true?
A.
Animals worry about raising their family
B.
Animals make several feeding trips in a day
C.
Animals often behave sensibly
D.
Animals do not know meaning of brotherhood
Ans:
Animals make several feeding trips in a day
Explanation :
Animal Kingdom is usually a short day; they take several feeding trips in a day. Big birds and antelope feed several times a day.
[25] If a healthy freshwater fish is placed in salt water, what will be the expected consequence?
A.
The fish becomes dehydrated and dies
B.
The fish becomes bloated and dies
C.
The fish suffers from fungal or bacterial disease and dies
D.
There is no observable effect on the fish provided there is sufficient food
Ans:
The fish becomes dehydrated and dies
Explanation :
When freshwater fish is placed in salt water, the water molecules contained in the fish's body would pass through the cell membranes of the fish, causing the fish to lose water by diffusion. This sudden change in the molecular makeup of the fish would cause the fish to die.
Explanation :
Biofortification is the breeding crops to increase their nutritional value. This can be done either through conventional selective breeding or genetic engineering. Biofortification differs from ordinary fortification because it focuses on making plant foods more nutritious as the plants are growing, rather than having nutrients added to the foods when they are being processed.
[24] Which of the following statements is true?
A.
Animals worry about raising their family
B.
Animals make several feeding trips in a day
C.
Animals often behave sensibly
D.
Animals do not know meaning of brotherhood
Ans:
Animals make several feeding trips in a day
Explanation :
Animal Kingdom is usually a short day; they take several feeding trips in a day. Big birds and antelope feed several times a day.
[25] If a healthy freshwater fish is placed in salt water, what will be the expected consequence?
A.
The fish becomes dehydrated and dies
B.
The fish becomes bloated and dies
C.
The fish suffers from fungal or bacterial disease and dies
D.
There is no observable effect on the fish provided there is sufficient food
Ans:
The fish becomes dehydrated and dies
Explanation :
When freshwater fish is placed in salt water, the water molecules contained in the fish's body would pass through the cell membranes of the fish, causing the fish to lose water by diffusion. This sudden change in the molecular makeup of the fish would cause the fish to die.
Explanation :
When freshwater fish is placed in salt water, the water molecules contained in the fish's body would pass through the cell membranes of the fish, causing the fish to lose water by diffusion. This sudden change in the molecular makeup of the fish would cause the fish to die.