[1] Green House Effect' means
A.
Pollution in houses in tropical region
B.
Prevention of ultraviolet radiation by the ozone layer
C.
Trapping of solar energy due to atmospheric gases
D.
Damage to green painted buildings
Ans:
Trapping of solar energy due to atmospheric gases
Explanation :
The greenhouse effect occurs when Earth's atmosphere traps solar radiation because of the presence of certain gases, causing the heating of the earth. These greenhouse gases include water vapor, CO2, methane, nitrous oxide (N2O) and other gases, ac-cording to the Environmental Protection Agency (EPA
[2] The presence of air bubble in blood stream is dangerous to life because-
A.
Air combines with blood forming a complex
B.
The flow of blood increases manifold
C.
The flow of blood is obstructed
D.
The pressure of blood increases manifold
Ans:
The flow of blood is obstructed
Explanation :
The presence of air bubble in blood, known as air embolism occludes blood vessels. The flow of blood is obstructed causing strokes, heart attacks, pulmonary complications. An arterial air embolism is far more dangerous than a venous embolism since it prevents oxygenated blood from reaching the target organ and cause ischemia. It can lead to heart attack and death.
[3] In human body, ligaments are made up of
A.
white fibres and some yellow elastic fibres
B.
white fibres only
C.
yellow fibres only
D.
yellow fibres and muscle fibres
Ans:
white fibres and some yellow elastic fibres
Explanation :
A ligament is composed of dense fibrous bundles of collagenous fibres and spindle-shaped cells known as fibrocytes, with little ground substance. Ligaments may be of two major types: white ligament is rich in coilagenous fibres, which are sturdy and inelastic; and yellow ligament is rich in elastic fibres, which are quite tough even though they allow elastic movement.
[4] People consuming alcohol in heavy quantities generally die of -
A.
liver or stomach cancer
B.
weakening of heart muscles leading to cardiac arrest
C.
blood cancer
D.
Cirrhosis
Ans:
Cirrhosis
Explanation :
Cirrhosis is a condition in which the liver does not function properly due to long-term damage. This damage is characterized by the replacement of normal liver tissue by scar tissue.
[5] Honey that has high concentration of sugar does not decay because
A.
Bacteria cannot survive in an active state as it is totally deprived of oxygen
B.
It contains natural antioxidant that prevents bacterial attack
C.
Bacteria cannot survive in an active state in a solution of high osmotic strength as water is drawn out
D.
None of these
Ans:
Bacteria cannot survive in an active state in a solution of high osmotic strength as water is drawn out
Explanation :
The reason why bacteria does not grow in high concentration of sugar is because of sugar's high osmotic and dehydrating effects. Sugar, whether in solid or aqueous form, attempts to reach equilibrium with the sugar content of the food product with which it is in contact. This has the effect of drawing available water from within the food to the outside and inserting sugar molecules into the food interior. The result is a reduction of the so-called product water activity (aw), a measure of unbound, free water molecules in the food that is necessary for microbial survival and growth.
[6] What is‘Biodiversity?
A.
Many types of flora & fauna in one forest
B.
Many types of flora and fauna in many forests
C.
Many population of one species in one forest
D.
All the above are true,
Ans:
Many types of flora & fauna in one forest
Explanation :
Biodiversity is the degree of variation of life. It is a measure of the variety of organisms present in different ecosystems or on the entire Earth. Biologists most often define biodiversity as the "totality of genes, species, and ecosystems of a region"
[7] In the grass lands, trees do not replace the grasses as a part of an ecological succession because of -
A.
Limited sun light and paucity of nutrients
B.
None of the options
C.
Insect and fungi
D.
Water limits and fire
Ans:
Water limits and fire
Explanation :
Grass ecosystems are an early stage of succession in regions where the mature ecosystems are forests. However, grass ecosystems are climax ecosystems in grassland regions, where there is not enough rainfall to support a forest. Due to limiting, factors such as water scarcity and forest fire, a grass land ecosystem changes to a desert ecosystem. The ecological succession of grassland is desert. It is, however, notable that the soil of grassland ecosystem is rich in nutrients and organic matters and pro- vides the largest biomass.
[8] What does the term Ebola stand for?
A.
A viral disease outbreak in West Africa
B.
A viral disease outbreak in Bangladesh
C.
A city in Syria destroyed by ISIS.
D.
None of these
Ans:
A viral disease outbreak in West Africa
Explanation :
Ebola is a viral hemorrhagic fever of humans and other primates caused by ebolaviruses. The largest outbreak to date of Ebola was the epidemic in West Africa, which occurred from December 2013 to January 2016 with 28,616 cases and 11,310 deaths.
[9] Which of the following is true for photoperiodic?
A.
It occurs only in plants
B.
It is related to flowering in plants
C.
It is related to feathers of animals
D.
It is the reaction of organisms to the length of day or night
Ans:
It is the reaction of organisms to the length of day or night
Explanation :
Photoperiodism is the physiological reaction of organisms to the length of day or night. The term "Photoperiodism" was coined to describe a plant's ability to flower in response to changes in the photo period: the relative lengths of day and night. Because flowers produce seeds, flowering is crucially important for the plant to complete its life cycle.
[10] X-rays can be used
A.
for cutting and welding of metals.
B.
to detect heart diseases.
C.
to detect defects in precious stones and diamonds.
D.
to detect gold under the earth.
Ans:
to detect defects in precious stones and diamonds.
Explanation :
X-rays are used to detect and photograph defects of internal structure of a body such as metals, machine parts, cracks in wood, defects in diamonds and other precious stones, etc. They can reveal in homogeneities—such as inclusions, lattice defects, etc in gems and stones.
[11] ‘Coralloid root’ of Cycas helps in -
A.
Absorption of water
B.
Absorption of water and fixation of Nitrogen
C.
Anchorage
D.
Transport of food
Ans:
Absorption of water and fixation of Nitrogen
Explanation :
Branch roots are of two kinds: long-branching geotropic roots and short-branching apogeotropic roots, which are referred to as coralloid because of their irregular, beady appearance. The coralloid roots contain symbiotic cyanobacteria (blue-green algae), which fix nitrogen. It also collects water and soil nutrients and store carbohydrates.
[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 greenhouse effect occurs when Earth's atmosphere traps solar radiation because of the presence of certain gases, causing the heating of the earth. These greenhouse gases include water vapor, CO2, methane, nitrous oxide (N2O) and other gases, ac-cording to the Environmental Protection Agency (EPA
[2] The presence of air bubble in blood stream is dangerous to life because-
A.
Air combines with blood forming a complex
B.
The flow of blood increases manifold
C.
The flow of blood is obstructed
D.
The pressure of blood increases manifold
Ans:
The flow of blood is obstructed
Explanation :
The presence of air bubble in blood, known as air embolism occludes blood vessels. The flow of blood is obstructed causing strokes, heart attacks, pulmonary complications. An arterial air embolism is far more dangerous than a venous embolism since it prevents oxygenated blood from reaching the target organ and cause ischemia. It can lead to heart attack and death.
[3] In human body, ligaments are made up of
A.
white fibres and some yellow elastic fibres
B.
white fibres only
C.
yellow fibres only
D.
yellow fibres and muscle fibres
Ans:
white fibres and some yellow elastic fibres
Explanation :
A ligament is composed of dense fibrous bundles of collagenous fibres and spindle-shaped cells known as fibrocytes, with little ground substance. Ligaments may be of two major types: white ligament is rich in coilagenous fibres, which are sturdy and inelastic; and yellow ligament is rich in elastic fibres, which are quite tough even though they allow elastic movement.
[4] People consuming alcohol in heavy quantities generally die of -
A.
liver or stomach cancer
B.
weakening of heart muscles leading to cardiac arrest
C.
blood cancer
D.
Cirrhosis
Ans:
Cirrhosis
Explanation :
Cirrhosis is a condition in which the liver does not function properly due to long-term damage. This damage is characterized by the replacement of normal liver tissue by scar tissue.
[5] Honey that has high concentration of sugar does not decay because
A.
Bacteria cannot survive in an active state as it is totally deprived of oxygen
B.
It contains natural antioxidant that prevents bacterial attack
C.
Bacteria cannot survive in an active state in a solution of high osmotic strength as water is drawn out
D.
None of these
Ans:
Bacteria cannot survive in an active state in a solution of high osmotic strength as water is drawn out
Explanation :
The reason why bacteria does not grow in high concentration of sugar is because of sugar's high osmotic and dehydrating effects. Sugar, whether in solid or aqueous form, attempts to reach equilibrium with the sugar content of the food product with which it is in contact. This has the effect of drawing available water from within the food to the outside and inserting sugar molecules into the food interior. The result is a reduction of the so-called product water activity (aw), a measure of unbound, free water molecules in the food that is necessary for microbial survival and growth.
[6] What is‘Biodiversity?
A.
Many types of flora & fauna in one forest
B.
Many types of flora and fauna in many forests
C.
Many population of one species in one forest
D.
All the above are true,
Ans:
Many types of flora & fauna in one forest
Explanation :
Biodiversity is the degree of variation of life. It is a measure of the variety of organisms present in different ecosystems or on the entire Earth. Biologists most often define biodiversity as the "totality of genes, species, and ecosystems of a region"
[7] In the grass lands, trees do not replace the grasses as a part of an ecological succession because of -
A.
Limited sun light and paucity of nutrients
B.
None of the options
C.
Insect and fungi
D.
Water limits and fire
Ans:
Water limits and fire
Explanation :
Grass ecosystems are an early stage of succession in regions where the mature ecosystems are forests. However, grass ecosystems are climax ecosystems in grassland regions, where there is not enough rainfall to support a forest. Due to limiting, factors such as water scarcity and forest fire, a grass land ecosystem changes to a desert ecosystem. The ecological succession of grassland is desert. It is, however, notable that the soil of grassland ecosystem is rich in nutrients and organic matters and pro- vides the largest biomass.
[8] What does the term Ebola stand for?
A.
A viral disease outbreak in West Africa
B.
A viral disease outbreak in Bangladesh
C.
A city in Syria destroyed by ISIS.
D.
None of these
Ans:
A viral disease outbreak in West Africa
Explanation :
Ebola is a viral hemorrhagic fever of humans and other primates caused by ebolaviruses. The largest outbreak to date of Ebola was the epidemic in West Africa, which occurred from December 2013 to January 2016 with 28,616 cases and 11,310 deaths.
[9] Which of the following is true for photoperiodic?
A.
It occurs only in plants
B.
It is related to flowering in plants
C.
It is related to feathers of animals
D.
It is the reaction of organisms to the length of day or night
Ans:
It is the reaction of organisms to the length of day or night
Explanation :
Photoperiodism is the physiological reaction of organisms to the length of day or night. The term "Photoperiodism" was coined to describe a plant's ability to flower in response to changes in the photo period: the relative lengths of day and night. Because flowers produce seeds, flowering is crucially important for the plant to complete its life cycle.
[10] X-rays can be used
A.
for cutting and welding of metals.
B.
to detect heart diseases.
C.
to detect defects in precious stones and diamonds.
D.
to detect gold under the earth.
Ans:
to detect defects in precious stones and diamonds.
Explanation :
X-rays are used to detect and photograph defects of internal structure of a body such as metals, machine parts, cracks in wood, defects in diamonds and other precious stones, etc. They can reveal in homogeneities—such as inclusions, lattice defects, etc in gems and stones.
[11] ‘Coralloid root’ of Cycas helps in -
A.
Absorption of water
B.
Absorption of water and fixation of Nitrogen
C.
Anchorage
D.
Transport of food
Ans:
Absorption of water and fixation of Nitrogen
Explanation :
Branch roots are of two kinds: long-branching geotropic roots and short-branching apogeotropic roots, which are referred to as coralloid because of their irregular, beady appearance. The coralloid roots contain symbiotic cyanobacteria (blue-green algae), which fix nitrogen. It also collects water and soil nutrients and store carbohydrates.
[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 ligament is composed of dense fibrous bundles of collagenous fibres and spindle-shaped cells known as fibrocytes, with little ground substance. Ligaments may be of two major types: white ligament is rich in coilagenous fibres, which are sturdy and inelastic; and yellow ligament is rich in elastic fibres, which are quite tough even though they allow elastic movement.
[4] People consuming alcohol in heavy quantities generally die of -
A.
liver or stomach cancer
B.
weakening of heart muscles leading to cardiac arrest
C.
blood cancer
D.
Cirrhosis
Ans:
Cirrhosis
Explanation :
Cirrhosis is a condition in which the liver does not function properly due to long-term damage. This damage is characterized by the replacement of normal liver tissue by scar tissue.
[5] Honey that has high concentration of sugar does not decay because
A.
Bacteria cannot survive in an active state as it is totally deprived of oxygen
B.
It contains natural antioxidant that prevents bacterial attack
C.
Bacteria cannot survive in an active state in a solution of high osmotic strength as water is drawn out
D.
None of these
Ans:
Bacteria cannot survive in an active state in a solution of high osmotic strength as water is drawn out
Explanation :
The reason why bacteria does not grow in high concentration of sugar is because of sugar's high osmotic and dehydrating effects. Sugar, whether in solid or aqueous form, attempts to reach equilibrium with the sugar content of the food product with which it is in contact. This has the effect of drawing available water from within the food to the outside and inserting sugar molecules into the food interior. The result is a reduction of the so-called product water activity (aw), a measure of unbound, free water molecules in the food that is necessary for microbial survival and growth.
[6] What is‘Biodiversity?
A.
Many types of flora & fauna in one forest
B.
Many types of flora and fauna in many forests
C.
Many population of one species in one forest
D.
All the above are true,
Ans:
Many types of flora & fauna in one forest
Explanation :
Biodiversity is the degree of variation of life. It is a measure of the variety of organisms present in different ecosystems or on the entire Earth. Biologists most often define biodiversity as the "totality of genes, species, and ecosystems of a region"
[7] In the grass lands, trees do not replace the grasses as a part of an ecological succession because of -
A.
Limited sun light and paucity of nutrients
B.
None of the options
C.
Insect and fungi
D.
Water limits and fire
Ans:
Water limits and fire
Explanation :
Grass ecosystems are an early stage of succession in regions where the mature ecosystems are forests. However, grass ecosystems are climax ecosystems in grassland regions, where there is not enough rainfall to support a forest. Due to limiting, factors such as water scarcity and forest fire, a grass land ecosystem changes to a desert ecosystem. The ecological succession of grassland is desert. It is, however, notable that the soil of grassland ecosystem is rich in nutrients and organic matters and pro- vides the largest biomass.
[8] What does the term Ebola stand for?
A.
A viral disease outbreak in West Africa
B.
A viral disease outbreak in Bangladesh
C.
A city in Syria destroyed by ISIS.
D.
None of these
Ans:
A viral disease outbreak in West Africa
Explanation :
Ebola is a viral hemorrhagic fever of humans and other primates caused by ebolaviruses. The largest outbreak to date of Ebola was the epidemic in West Africa, which occurred from December 2013 to January 2016 with 28,616 cases and 11,310 deaths.
[9] Which of the following is true for photoperiodic?
A.
It occurs only in plants
B.
It is related to flowering in plants
C.
It is related to feathers of animals
D.
It is the reaction of organisms to the length of day or night
Ans:
It is the reaction of organisms to the length of day or night
Explanation :
Photoperiodism is the physiological reaction of organisms to the length of day or night. The term "Photoperiodism" was coined to describe a plant's ability to flower in response to changes in the photo period: the relative lengths of day and night. Because flowers produce seeds, flowering is crucially important for the plant to complete its life cycle.
[10] X-rays can be used
A.
for cutting and welding of metals.
B.
to detect heart diseases.
C.
to detect defects in precious stones and diamonds.
D.
to detect gold under the earth.
Ans:
to detect defects in precious stones and diamonds.
Explanation :
X-rays are used to detect and photograph defects of internal structure of a body such as metals, machine parts, cracks in wood, defects in diamonds and other precious stones, etc. They can reveal in homogeneities—such as inclusions, lattice defects, etc in gems and stones.
[11] ‘Coralloid root’ of Cycas helps in -
A.
Absorption of water
B.
Absorption of water and fixation of Nitrogen
C.
Anchorage
D.
Transport of food
Ans:
Absorption of water and fixation of Nitrogen
Explanation :
Branch roots are of two kinds: long-branching geotropic roots and short-branching apogeotropic roots, which are referred to as coralloid because of their irregular, beady appearance. The coralloid roots contain symbiotic cyanobacteria (blue-green algae), which fix nitrogen. It also collects water and soil nutrients and store carbohydrates.
[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 reason why bacteria does not grow in high concentration of sugar is because of sugar's high osmotic and dehydrating effects. Sugar, whether in solid or aqueous form, attempts to reach equilibrium with the sugar content of the food product with which it is in contact. This has the effect of drawing available water from within the food to the outside and inserting sugar molecules into the food interior. The result is a reduction of the so-called product water activity (aw), a measure of unbound, free water molecules in the food that is necessary for microbial survival and growth.
[6] What is‘Biodiversity?
A.
Many types of flora & fauna in one forest
B.
Many types of flora and fauna in many forests
C.
Many population of one species in one forest
D.
All the above are true,
Ans:
Many types of flora & fauna in one forest
Explanation :
Biodiversity is the degree of variation of life. It is a measure of the variety of organisms present in different ecosystems or on the entire Earth. Biologists most often define biodiversity as the "totality of genes, species, and ecosystems of a region"
[7] In the grass lands, trees do not replace the grasses as a part of an ecological succession because of -
A.
Limited sun light and paucity of nutrients
B.
None of the options
C.
Insect and fungi
D.
Water limits and fire
Ans:
Water limits and fire
Explanation :
Grass ecosystems are an early stage of succession in regions where the mature ecosystems are forests. However, grass ecosystems are climax ecosystems in grassland regions, where there is not enough rainfall to support a forest. Due to limiting, factors such as water scarcity and forest fire, a grass land ecosystem changes to a desert ecosystem. The ecological succession of grassland is desert. It is, however, notable that the soil of grassland ecosystem is rich in nutrients and organic matters and pro- vides the largest biomass.
[8] What does the term Ebola stand for?
A.
A viral disease outbreak in West Africa
B.
A viral disease outbreak in Bangladesh
C.
A city in Syria destroyed by ISIS.
D.
None of these
Ans:
A viral disease outbreak in West Africa
Explanation :
Ebola is a viral hemorrhagic fever of humans and other primates caused by ebolaviruses. The largest outbreak to date of Ebola was the epidemic in West Africa, which occurred from December 2013 to January 2016 with 28,616 cases and 11,310 deaths.
[9] Which of the following is true for photoperiodic?
A.
It occurs only in plants
B.
It is related to flowering in plants
C.
It is related to feathers of animals
D.
It is the reaction of organisms to the length of day or night
Ans:
It is the reaction of organisms to the length of day or night
Explanation :
Photoperiodism is the physiological reaction of organisms to the length of day or night. The term "Photoperiodism" was coined to describe a plant's ability to flower in response to changes in the photo period: the relative lengths of day and night. Because flowers produce seeds, flowering is crucially important for the plant to complete its life cycle.
[10] X-rays can be used
A.
for cutting and welding of metals.
B.
to detect heart diseases.
C.
to detect defects in precious stones and diamonds.
D.
to detect gold under the earth.
Ans:
to detect defects in precious stones and diamonds.
Explanation :
X-rays are used to detect and photograph defects of internal structure of a body such as metals, machine parts, cracks in wood, defects in diamonds and other precious stones, etc. They can reveal in homogeneities—such as inclusions, lattice defects, etc in gems and stones.
[11] ‘Coralloid root’ of Cycas helps in -
A.
Absorption of water
B.
Absorption of water and fixation of Nitrogen
C.
Anchorage
D.
Transport of food
Ans:
Absorption of water and fixation of Nitrogen
Explanation :
Branch roots are of two kinds: long-branching geotropic roots and short-branching apogeotropic roots, which are referred to as coralloid because of their irregular, beady appearance. The coralloid roots contain symbiotic cyanobacteria (blue-green algae), which fix nitrogen. It also collects water and soil nutrients and store carbohydrates.
[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 :
Grass ecosystems are an early stage of succession in regions where the mature ecosystems are forests. However, grass ecosystems are climax ecosystems in grassland regions, where there is not enough rainfall to support a forest. Due to limiting, factors such as water scarcity and forest fire, a grass land ecosystem changes to a desert ecosystem. The ecological succession of grassland is desert. It is, however, notable that the soil of grassland ecosystem is rich in nutrients and organic matters and pro- vides the largest biomass.
[8] What does the term Ebola stand for?
A.
A viral disease outbreak in West Africa
B.
A viral disease outbreak in Bangladesh
C.
A city in Syria destroyed by ISIS.
D.
None of these
Ans:
A viral disease outbreak in West Africa
Explanation :
Ebola is a viral hemorrhagic fever of humans and other primates caused by ebolaviruses. The largest outbreak to date of Ebola was the epidemic in West Africa, which occurred from December 2013 to January 2016 with 28,616 cases and 11,310 deaths.
[9] Which of the following is true for photoperiodic?
A.
It occurs only in plants
B.
It is related to flowering in plants
C.
It is related to feathers of animals
D.
It is the reaction of organisms to the length of day or night
Ans:
It is the reaction of organisms to the length of day or night
Explanation :
Photoperiodism is the physiological reaction of organisms to the length of day or night. The term "Photoperiodism" was coined to describe a plant's ability to flower in response to changes in the photo period: the relative lengths of day and night. Because flowers produce seeds, flowering is crucially important for the plant to complete its life cycle.
[10] X-rays can be used
A.
for cutting and welding of metals.
B.
to detect heart diseases.
C.
to detect defects in precious stones and diamonds.
D.
to detect gold under the earth.
Ans:
to detect defects in precious stones and diamonds.
Explanation :
X-rays are used to detect and photograph defects of internal structure of a body such as metals, machine parts, cracks in wood, defects in diamonds and other precious stones, etc. They can reveal in homogeneities—such as inclusions, lattice defects, etc in gems and stones.
[11] ‘Coralloid root’ of Cycas helps in -
A.
Absorption of water
B.
Absorption of water and fixation of Nitrogen
C.
Anchorage
D.
Transport of food
Ans:
Absorption of water and fixation of Nitrogen
Explanation :
Branch roots are of two kinds: long-branching geotropic roots and short-branching apogeotropic roots, which are referred to as coralloid because of their irregular, beady appearance. The coralloid roots contain symbiotic cyanobacteria (blue-green algae), which fix nitrogen. It also collects water and soil nutrients and store carbohydrates.
[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 :
Photoperiodism is the physiological reaction of organisms to the length of day or night. The term "Photoperiodism" was coined to describe a plant's ability to flower in response to changes in the photo period: the relative lengths of day and night. Because flowers produce seeds, flowering is crucially important for the plant to complete its life cycle.
[10] X-rays can be used
A.
for cutting and welding of metals.
B.
to detect heart diseases.
C.
to detect defects in precious stones and diamonds.
D.
to detect gold under the earth.
Ans:
to detect defects in precious stones and diamonds.
Explanation :
X-rays are used to detect and photograph defects of internal structure of a body such as metals, machine parts, cracks in wood, defects in diamonds and other precious stones, etc. They can reveal in homogeneities—such as inclusions, lattice defects, etc in gems and stones.
[11] ‘Coralloid root’ of Cycas helps in -
A.
Absorption of water
B.
Absorption of water and fixation of Nitrogen
C.
Anchorage
D.
Transport of food
Ans:
Absorption of water and fixation of Nitrogen
Explanation :
Branch roots are of two kinds: long-branching geotropic roots and short-branching apogeotropic roots, which are referred to as coralloid because of their irregular, beady appearance. The coralloid roots contain symbiotic cyanobacteria (blue-green algae), which fix nitrogen. It also collects water and soil nutrients and store carbohydrates.
[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 :
Branch roots are of two kinds: long-branching geotropic roots and short-branching apogeotropic roots, which are referred to as coralloid because of their irregular, beady appearance. The coralloid roots contain symbiotic cyanobacteria (blue-green algae), which fix nitrogen. It also collects water and soil nutrients and store carbohydrates.
[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.