[1] The sense of balance is achieved by -
A.
Cerebrum equilibrium
B.
Thalamus equilibrium
C.
Cerebellum equilibrium
D.
Spinal cord equilibrium
Ans:
Cerebellum equilibrium
Explanation :
The cerebellum equilibrium controls the aspects of balance, equilibrium, and muscle tone, which are factors that provide for smooth movement and activity. Electrical impulses from the cerebellum stimulate muscles that are responsible for voluntary movement, and it works in coordination with the motor cortices of the cerebrum for this overall function.
[2] Christmas factor is involved in -
A.
Blood Coagulation
B.
Excretion
C.
Digestion
D.
Respiration
Ans:
Blood Coagulation
Explanation :
Factor IX, also known as Christmas factor, is one of the serine proteases of the coagulation system; it belongs to peptidase family Sl. Deficiency of this protein causes hemophilia B. It was discovered in 1952 after a young boy named Stephen Christmas was found to be lacking this exact factor, leading to haemophilia.
[3] Which Vitamins are those, if taken in excess can be dangerous as they are stored in the body?
A.
B Complex
B.
E and C
C.
B and C
D.
A and D
Ans:
A and D
Explanation :
Vitamins A, D, E, and K are the fat-soluble vitamins. Unlike water-soluble vitamins, these vitamins dissolve in fat and are stored in body tissues. Too much vitamin A, D, or K can lead to increased levels that are unhealthy and can cause health consequences. For example, too much vitamin A can lead to birth defects.
[4] Inhibition of photosynthesis in the presence of O2 in C3 plants is called-
A.
Hexose monophosphate shunt
B.
Pasteur effect
C.
Decker effect
D.
Warburg effect
Ans:
Warburg effect
Explanation :
An increase in the oxygen concentration in many plants results in a decrease in the rate of photosynthesis. This phenomenon of the inhibition of photosynthesis by O2 was first discovered by a German biochemist Warburg in 1920 in Chorella (a green alga) and is called Warburg effect. O2 causes greatest inhibition of photosynthesis when CO2 levels are low and light levels are saturating. This effect is known to occur in C3 plants (Soyabean) and C4 plants (Sorghum, Maize, Sugarcane), etc.
[5] In mammals, an important role of excretion is played by -
A.
Large intestine
B.
Kidneys
C.
Lungs
D.
Liver
Ans:
Kidneys
Explanation :
The kidneys are bean-shaped organs that serve several excretory roles apart from the essential regulatory roles in mammals. They remove from the blood the nitrogenous wastes such as urea, as well as salts and excess water, and excrete them in the form of urine. In producing urine, the kidneys excrete nitrogenous wastes such as urea and ammonium.
[6] Who among the following is credited with starting the work on plant tissue culture?
A.
F.C. Steward
B.
P. Maheshwari
C.
P.R. White
D.
Haberlandt
Ans:
Haberlandt
Explanation :
G. Haberlandt, a German botanist, in 1902 cultured fully differentiated plant cells isolated from different plants. This was the very first step for the beginning of plant cell and tissue culture. Further contributions were made by the Cell Doctrine which admitted that a cell is capable of showing totipotency.
[7] Spraying of DDT on crops causes pollution of _.
A.
Air & Soil
B.
Crops & Air
C.
Soil & Water
D.
Air & Water
Ans:
Soil & Water
Explanation :
DDT is a persistent organic pollutant that is readily adsorbed to soils and sediments, which can act both as sinks and as long-term sources of exposure affecting organisms. Besides, spraying pesticides like DDT on plants pollutes the ground water system which contaminates the entire food chain by severely affecting humans dependent on these.
[8] Which cells in pancreas produce Insulin?
A.
Thymus
B.
Estrogen
C.
Corpus epididymis
D.
Islets of Langerhans
Ans:
Islets of Langerhans
Explanation :
The islets of Langerhans are the regions of the pancreas that contain cells that produce hormones. There are five types of cells in the islets of Langerhans: beta cells secrete insulin; alpha cells secrete glucagon; PP cells secrete pancreatic polypeptide; delta cells secrete somatostatin; and epsilon cells secrete ghrelin.
[9] Yeast is a .
A.
Bacteria
B.
Fungi
C.
Algae
D.
Bryophyte
Ans:
Fungi
Explanation :
Yeast are eukaryotic, single-celled microorganisms classified as members of the fungus kingdom. They are estimated to constitute 1% of all described fungal species. Yeasts, such as Candida albicans, are opportunistic pathogens and can cause infections in humans.
[10] Which of the following is not connective tissue?
A.
Bone
B.
Cartilage
C.
Blood
D.
Skeletal muscle
Ans:
Skeletal muscle
Explanation :
Skeletal muscle is a form of striated muscle tissue which is under the voluntary control of the somatic nervous system. Most skeletal muscles are attached to bones by bundles of collagen fibers known as tendons. It is one of three major muscle types, the others being cardiac muscle and smooth muscle.
[11] The hormone that stimulates heart beat is -
A.
Thyroxine
B.
Gastrin
C.
Glycogen
D.
Dopamine
Ans:
Thyroxine
Explanation :
Thyroxine is the main hormone secreted into the bloodstream by the thyroid gland. It plays vital roles in digestion, heart and muscle function, brain development and maintenance of bones. It increases heart rate, cardiac contractility and cardiac output and also promotes vasodilation, which leads to enhanced blood flow to many organs.
[12] Which of the following gas leaked in the Bhopal Gas tragedy in December 1984?
A.
Methyl isocyanate
B.
Methyl isochlorate
C.
Methyl phosphate
D.
Methyl isopropate
Ans:
Methyl isocyanate
Explanation :
In the gas tragedy that occurred at the Union Carbide India Limited pesticide plant in Bhopal, Madhya Pradesh, on 2-3 December 1984, over 500,000 people were exposed to toxic methyl isocyanate (MIC) gas and other chemicals. An estimated 10,000 or more people died.
[13] The disease Beri Beri is caused due to the deficiency of which of the following?
A.
Vitamin B2
B.
Vitamin B1
C.
Vitamin B12
D.
Vitamin E
Ans:
Vitamin B1
Explanation :
Beriberi is a disease caused by a vitamin B1 (thiamine) deficiency. There are two types of the disease: wet beriberi and dry beriberi. Wet beriberi affects the heart and circulatory system. In extreme cases, wet beriberi can cause heart failure. Dry beriberi damages the nerves and can lead to a loss of muscle strength and eventually, muscle paralysis.
[14] Excessive secretion from the pituitary gland in children results in -
A.
increased height
B.
retarded growth
C.
weakening of bones
D.
None of the above
Ans:
increased height
Explanation :
Excessive secretion from the pituitary gland in the children results in increased height. In children and adolescents, excessive levels of growth hormone can result in a condition called gigantism. Children with this condition may have unusually long arms and legs and may grow to heights of 7 to 8 feet or more.
[15] Which one of the following is known as the ‘immovable property’ in the cell?
A.
Carbohydrate
B.
Fat
C.
Protein
D.
Nucleic acid
Ans:
Nucleic acid
Explanation :
Nucleic acids are large biological molecules essential for all known forms of life. They include DNA (deoxyribonucleic acid) and RNA (ribonucleic acid). Immovable property is an immovable object, an item of property that cannot be moved without destroying or altering it – property that is fixed to the earth, such as land or a house.
[16] Ozone protects biosphere from -
A.
X-rays
B.
Gamma rays
C.
Ultraviolet rays
D.
Infrared rays
Ans:
Ultraviolet rays
Explanation :
Ozone is an allotrope of oxygen that is formed from dioxygen by the action of ultraviolet light and also atmospheric electrical discharges. The ozone layer in the stratosphere acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects.
[17] Omithophily is effected by -
A.
snails
B.
bats
C.
insects
D.
birds
Ans:
birds
Explanation :
Omithophily or bird pollination is the pollination of flowering plants by birds. This coevolutionary association is derived from insect pollination (entomophily) and is particularly well developed in some parts of the world, especially in the tropics and on some island chains.
[18] The xylem in plants are responsible for -
A.
transport of water
B.
transport of food
C.
transport of amino acids
D.
transport of oxygen
Ans:
transport of water
Explanation :
Xylem is one of the two types of transport tissue in vascular plants, phloem being the other. The basic function of xylem is to transport water from roots to shoot and leaves, but it also transports some dissolved nutrients. Together with phloem (tissue that conducts sugars from the leaves to the rest of the plant), xylem is found in all vascular plants.
[19] Which of the following bacterium causes crown gall disease in plants?
A.
Bacillus thurigiensis
B.
Agrobacterium tumefaciens
C.
Pseudomonas fluorescens
D.
None of these
Ans:
Agrobacterium tumefaciens
Explanation :
Crown gall is a disease caused by the bacterium Agrobacterium tumefaciens (synonym Rhizobium radiobacter), which enters the plant through wounds in roots or stems and stimulates the plant tissues to grow in a disorganized way, producing swollen galls. As the disease progresses, plants lose vigour and may eventually die.
[20] Blood is red in colour due to the presence of -
A.
Cytochrome
B.
Chlorophyll
C.
Hemocyanin
D.
Haemoglobin
Ans:
Haemoglobin
Explanation :
The red color of blood comes from the hemoglobin that makes up the majority of the mass of the cell, which allows the blood cell to carry oxygen around the body. The plasma itself is a straw color when viewed under a microscope, but the hemoglobin makes up so much of the blood cell that its red color overpowers the color of the plasma.
[21] Which one of the following events in a botanical garden is never directly influenced by light?
A.
Flowering
B.
Photosynthesis
C.
Transpiration
D.
Fertilization
Ans:
Fertilization
Explanation :
Fertilization in plants is not directly influenced by sunlight. It occurs when pollen grains are transported from anthers to stigma. When ripe pollen from an anther catches on the stigma of the same kind of flower, each pollen grain sends out a small thread-like tube. Fertilization occurs after pollination, when pollen grains land on the stigma of a flower of the same species. During this time, a series of events take place leading to the formation of seeds.
[22] Which mosquito is the carrier of Zika virus?
A.
Culex
B.
Aedes
C.
Anopheles
D.
Culiseta
Ans:
Aedes
Explanation :
Zika virus (ZIKV) is a member of the virus family Flaviviridae is spread by daytime-active Aedes mosquitoes, such as A. aegypti and A. albopictus. Its name comes from the Zika Forest of Uganda, where the virus was first isolated in 1947. Zika virus is related to the dengue, yellow fever, Japanese encephalitis, and West Nile viruses.
[23] Root cap is derived from -
A.
Derm atogen
B.
Calyptrogen
C.
Protoderm
D.
Histogen
Ans:
Calyptrogen
Explanation :
Calyptrogen is a layer of rapidly dividing cells at the tip of a plant root, from which the root cap is formed. It occurs in grasses and many other plants. The root cap is formed by several layers of cells that envelop the root tip externally. This covering of cells, of which the outermost ones are dead, envelops and protects the growing tip very much as a thimble protects the finger.
[24] percent of Delhites are suffering from Asthma and Rhinitis.
A.
0.13
B.
0.1
C.
0.11
D.
0.12
Ans:
0.11
Explanation :
As per a recent survey conducted by Vallabhbhai Patel Chest Institute Delhi, more than an 11% of Delhiites are suffering from asthma and rhinitis. As per the survey, 11.69% were found to be suffering from rhinitis and 11.03% from asthma.
[25] A group of genes whose activity is coordinated by a DNA site is -
A.
operon
B.
cistron
C.
polysome
D.
polypeptide
Ans:
operon
Explanation :
The operon is defined as a group of genes whose activity is coordinated by a DNA site. An operon i s a functioning unit of genomic DNA containing a cluster of genes under the control of a single promoter. The genes are transcribed together into an mRNA strand and either translated together in the cytoplasm, or undergo trans-splicing to create monocistronic mR-NAs that are translated separately.
Explanation :
The cerebellum equilibrium controls the aspects of balance, equilibrium, and muscle tone, which are factors that provide for smooth movement and activity. Electrical impulses from the cerebellum stimulate muscles that are responsible for voluntary movement, and it works in coordination with the motor cortices of the cerebrum for this overall function.
[2] Christmas factor is involved in -
A.
Blood Coagulation
B.
Excretion
C.
Digestion
D.
Respiration
Ans:
Blood Coagulation
Explanation :
Factor IX, also known as Christmas factor, is one of the serine proteases of the coagulation system; it belongs to peptidase family Sl. Deficiency of this protein causes hemophilia B. It was discovered in 1952 after a young boy named Stephen Christmas was found to be lacking this exact factor, leading to haemophilia.
[3] Which Vitamins are those, if taken in excess can be dangerous as they are stored in the body?
A.
B Complex
B.
E and C
C.
B and C
D.
A and D
Ans:
A and D
Explanation :
Vitamins A, D, E, and K are the fat-soluble vitamins. Unlike water-soluble vitamins, these vitamins dissolve in fat and are stored in body tissues. Too much vitamin A, D, or K can lead to increased levels that are unhealthy and can cause health consequences. For example, too much vitamin A can lead to birth defects.
[4] Inhibition of photosynthesis in the presence of O2 in C3 plants is called-
A.
Hexose monophosphate shunt
B.
Pasteur effect
C.
Decker effect
D.
Warburg effect
Ans:
Warburg effect
Explanation :
An increase in the oxygen concentration in many plants results in a decrease in the rate of photosynthesis. This phenomenon of the inhibition of photosynthesis by O2 was first discovered by a German biochemist Warburg in 1920 in Chorella (a green alga) and is called Warburg effect. O2 causes greatest inhibition of photosynthesis when CO2 levels are low and light levels are saturating. This effect is known to occur in C3 plants (Soyabean) and C4 plants (Sorghum, Maize, Sugarcane), etc.
[5] In mammals, an important role of excretion is played by -
A.
Large intestine
B.
Kidneys
C.
Lungs
D.
Liver
Ans:
Kidneys
Explanation :
The kidneys are bean-shaped organs that serve several excretory roles apart from the essential regulatory roles in mammals. They remove from the blood the nitrogenous wastes such as urea, as well as salts and excess water, and excrete them in the form of urine. In producing urine, the kidneys excrete nitrogenous wastes such as urea and ammonium.
[6] Who among the following is credited with starting the work on plant tissue culture?
A.
F.C. Steward
B.
P. Maheshwari
C.
P.R. White
D.
Haberlandt
Ans:
Haberlandt
Explanation :
G. Haberlandt, a German botanist, in 1902 cultured fully differentiated plant cells isolated from different plants. This was the very first step for the beginning of plant cell and tissue culture. Further contributions were made by the Cell Doctrine which admitted that a cell is capable of showing totipotency.
[7] Spraying of DDT on crops causes pollution of _.
A.
Air & Soil
B.
Crops & Air
C.
Soil & Water
D.
Air & Water
Ans:
Soil & Water
Explanation :
DDT is a persistent organic pollutant that is readily adsorbed to soils and sediments, which can act both as sinks and as long-term sources of exposure affecting organisms. Besides, spraying pesticides like DDT on plants pollutes the ground water system which contaminates the entire food chain by severely affecting humans dependent on these.
[8] Which cells in pancreas produce Insulin?
A.
Thymus
B.
Estrogen
C.
Corpus epididymis
D.
Islets of Langerhans
Ans:
Islets of Langerhans
Explanation :
The islets of Langerhans are the regions of the pancreas that contain cells that produce hormones. There are five types of cells in the islets of Langerhans: beta cells secrete insulin; alpha cells secrete glucagon; PP cells secrete pancreatic polypeptide; delta cells secrete somatostatin; and epsilon cells secrete ghrelin.
[9] Yeast is a .
A.
Bacteria
B.
Fungi
C.
Algae
D.
Bryophyte
Ans:
Fungi
Explanation :
Yeast are eukaryotic, single-celled microorganisms classified as members of the fungus kingdom. They are estimated to constitute 1% of all described fungal species. Yeasts, such as Candida albicans, are opportunistic pathogens and can cause infections in humans.
[10] Which of the following is not connective tissue?
A.
Bone
B.
Cartilage
C.
Blood
D.
Skeletal muscle
Ans:
Skeletal muscle
Explanation :
Skeletal muscle is a form of striated muscle tissue which is under the voluntary control of the somatic nervous system. Most skeletal muscles are attached to bones by bundles of collagen fibers known as tendons. It is one of three major muscle types, the others being cardiac muscle and smooth muscle.
[11] The hormone that stimulates heart beat is -
A.
Thyroxine
B.
Gastrin
C.
Glycogen
D.
Dopamine
Ans:
Thyroxine
Explanation :
Thyroxine is the main hormone secreted into the bloodstream by the thyroid gland. It plays vital roles in digestion, heart and muscle function, brain development and maintenance of bones. It increases heart rate, cardiac contractility and cardiac output and also promotes vasodilation, which leads to enhanced blood flow to many organs.
[12] Which of the following gas leaked in the Bhopal Gas tragedy in December 1984?
A.
Methyl isocyanate
B.
Methyl isochlorate
C.
Methyl phosphate
D.
Methyl isopropate
Ans:
Methyl isocyanate
Explanation :
In the gas tragedy that occurred at the Union Carbide India Limited pesticide plant in Bhopal, Madhya Pradesh, on 2-3 December 1984, over 500,000 people were exposed to toxic methyl isocyanate (MIC) gas and other chemicals. An estimated 10,000 or more people died.
[13] The disease Beri Beri is caused due to the deficiency of which of the following?
A.
Vitamin B2
B.
Vitamin B1
C.
Vitamin B12
D.
Vitamin E
Ans:
Vitamin B1
Explanation :
Beriberi is a disease caused by a vitamin B1 (thiamine) deficiency. There are two types of the disease: wet beriberi and dry beriberi. Wet beriberi affects the heart and circulatory system. In extreme cases, wet beriberi can cause heart failure. Dry beriberi damages the nerves and can lead to a loss of muscle strength and eventually, muscle paralysis.
[14] Excessive secretion from the pituitary gland in children results in -
A.
increased height
B.
retarded growth
C.
weakening of bones
D.
None of the above
Ans:
increased height
Explanation :
Excessive secretion from the pituitary gland in the children results in increased height. In children and adolescents, excessive levels of growth hormone can result in a condition called gigantism. Children with this condition may have unusually long arms and legs and may grow to heights of 7 to 8 feet or more.
[15] Which one of the following is known as the ‘immovable property’ in the cell?
A.
Carbohydrate
B.
Fat
C.
Protein
D.
Nucleic acid
Ans:
Nucleic acid
Explanation :
Nucleic acids are large biological molecules essential for all known forms of life. They include DNA (deoxyribonucleic acid) and RNA (ribonucleic acid). Immovable property is an immovable object, an item of property that cannot be moved without destroying or altering it – property that is fixed to the earth, such as land or a house.
[16] Ozone protects biosphere from -
A.
X-rays
B.
Gamma rays
C.
Ultraviolet rays
D.
Infrared rays
Ans:
Ultraviolet rays
Explanation :
Ozone is an allotrope of oxygen that is formed from dioxygen by the action of ultraviolet light and also atmospheric electrical discharges. The ozone layer in the stratosphere acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects.
[17] Omithophily is effected by -
A.
snails
B.
bats
C.
insects
D.
birds
Ans:
birds
Explanation :
Omithophily or bird pollination is the pollination of flowering plants by birds. This coevolutionary association is derived from insect pollination (entomophily) and is particularly well developed in some parts of the world, especially in the tropics and on some island chains.
[18] The xylem in plants are responsible for -
A.
transport of water
B.
transport of food
C.
transport of amino acids
D.
transport of oxygen
Ans:
transport of water
Explanation :
Xylem is one of the two types of transport tissue in vascular plants, phloem being the other. The basic function of xylem is to transport water from roots to shoot and leaves, but it also transports some dissolved nutrients. Together with phloem (tissue that conducts sugars from the leaves to the rest of the plant), xylem is found in all vascular plants.
[19] Which of the following bacterium causes crown gall disease in plants?
A.
Bacillus thurigiensis
B.
Agrobacterium tumefaciens
C.
Pseudomonas fluorescens
D.
None of these
Ans:
Agrobacterium tumefaciens
Explanation :
Crown gall is a disease caused by the bacterium Agrobacterium tumefaciens (synonym Rhizobium radiobacter), which enters the plant through wounds in roots or stems and stimulates the plant tissues to grow in a disorganized way, producing swollen galls. As the disease progresses, plants lose vigour and may eventually die.
[20] Blood is red in colour due to the presence of -
A.
Cytochrome
B.
Chlorophyll
C.
Hemocyanin
D.
Haemoglobin
Ans:
Haemoglobin
Explanation :
The red color of blood comes from the hemoglobin that makes up the majority of the mass of the cell, which allows the blood cell to carry oxygen around the body. The plasma itself is a straw color when viewed under a microscope, but the hemoglobin makes up so much of the blood cell that its red color overpowers the color of the plasma.
[21] Which one of the following events in a botanical garden is never directly influenced by light?
A.
Flowering
B.
Photosynthesis
C.
Transpiration
D.
Fertilization
Ans:
Fertilization
Explanation :
Fertilization in plants is not directly influenced by sunlight. It occurs when pollen grains are transported from anthers to stigma. When ripe pollen from an anther catches on the stigma of the same kind of flower, each pollen grain sends out a small thread-like tube. Fertilization occurs after pollination, when pollen grains land on the stigma of a flower of the same species. During this time, a series of events take place leading to the formation of seeds.
[22] Which mosquito is the carrier of Zika virus?
A.
Culex
B.
Aedes
C.
Anopheles
D.
Culiseta
Ans:
Aedes
Explanation :
Zika virus (ZIKV) is a member of the virus family Flaviviridae is spread by daytime-active Aedes mosquitoes, such as A. aegypti and A. albopictus. Its name comes from the Zika Forest of Uganda, where the virus was first isolated in 1947. Zika virus is related to the dengue, yellow fever, Japanese encephalitis, and West Nile viruses.
[23] Root cap is derived from -
A.
Derm atogen
B.
Calyptrogen
C.
Protoderm
D.
Histogen
Ans:
Calyptrogen
Explanation :
Calyptrogen is a layer of rapidly dividing cells at the tip of a plant root, from which the root cap is formed. It occurs in grasses and many other plants. The root cap is formed by several layers of cells that envelop the root tip externally. This covering of cells, of which the outermost ones are dead, envelops and protects the growing tip very much as a thimble protects the finger.
[24] percent of Delhites are suffering from Asthma and Rhinitis.
A.
0.13
B.
0.1
C.
0.11
D.
0.12
Ans:
0.11
Explanation :
As per a recent survey conducted by Vallabhbhai Patel Chest Institute Delhi, more than an 11% of Delhiites are suffering from asthma and rhinitis. As per the survey, 11.69% were found to be suffering from rhinitis and 11.03% from asthma.
[25] A group of genes whose activity is coordinated by a DNA site is -
A.
operon
B.
cistron
C.
polysome
D.
polypeptide
Ans:
operon
Explanation :
The operon is defined as a group of genes whose activity is coordinated by a DNA site. An operon i s a functioning unit of genomic DNA containing a cluster of genes under the control of a single promoter. The genes are transcribed together into an mRNA strand and either translated together in the cytoplasm, or undergo trans-splicing to create monocistronic mR-NAs that are translated separately.
Explanation :
Vitamins A, D, E, and K are the fat-soluble vitamins. Unlike water-soluble vitamins, these vitamins dissolve in fat and are stored in body tissues. Too much vitamin A, D, or K can lead to increased levels that are unhealthy and can cause health consequences. For example, too much vitamin A can lead to birth defects.
[4] Inhibition of photosynthesis in the presence of O2 in C3 plants is called-
A.
Hexose monophosphate shunt
B.
Pasteur effect
C.
Decker effect
D.
Warburg effect
Ans:
Warburg effect
Explanation :
An increase in the oxygen concentration in many plants results in a decrease in the rate of photosynthesis. This phenomenon of the inhibition of photosynthesis by O2 was first discovered by a German biochemist Warburg in 1920 in Chorella (a green alga) and is called Warburg effect. O2 causes greatest inhibition of photosynthesis when CO2 levels are low and light levels are saturating. This effect is known to occur in C3 plants (Soyabean) and C4 plants (Sorghum, Maize, Sugarcane), etc.
[5] In mammals, an important role of excretion is played by -
A.
Large intestine
B.
Kidneys
C.
Lungs
D.
Liver
Ans:
Kidneys
Explanation :
The kidneys are bean-shaped organs that serve several excretory roles apart from the essential regulatory roles in mammals. They remove from the blood the nitrogenous wastes such as urea, as well as salts and excess water, and excrete them in the form of urine. In producing urine, the kidneys excrete nitrogenous wastes such as urea and ammonium.
[6] Who among the following is credited with starting the work on plant tissue culture?
A.
F.C. Steward
B.
P. Maheshwari
C.
P.R. White
D.
Haberlandt
Ans:
Haberlandt
Explanation :
G. Haberlandt, a German botanist, in 1902 cultured fully differentiated plant cells isolated from different plants. This was the very first step for the beginning of plant cell and tissue culture. Further contributions were made by the Cell Doctrine which admitted that a cell is capable of showing totipotency.
[7] Spraying of DDT on crops causes pollution of _.
A.
Air & Soil
B.
Crops & Air
C.
Soil & Water
D.
Air & Water
Ans:
Soil & Water
Explanation :
DDT is a persistent organic pollutant that is readily adsorbed to soils and sediments, which can act both as sinks and as long-term sources of exposure affecting organisms. Besides, spraying pesticides like DDT on plants pollutes the ground water system which contaminates the entire food chain by severely affecting humans dependent on these.
[8] Which cells in pancreas produce Insulin?
A.
Thymus
B.
Estrogen
C.
Corpus epididymis
D.
Islets of Langerhans
Ans:
Islets of Langerhans
Explanation :
The islets of Langerhans are the regions of the pancreas that contain cells that produce hormones. There are five types of cells in the islets of Langerhans: beta cells secrete insulin; alpha cells secrete glucagon; PP cells secrete pancreatic polypeptide; delta cells secrete somatostatin; and epsilon cells secrete ghrelin.
[9] Yeast is a .
A.
Bacteria
B.
Fungi
C.
Algae
D.
Bryophyte
Ans:
Fungi
Explanation :
Yeast are eukaryotic, single-celled microorganisms classified as members of the fungus kingdom. They are estimated to constitute 1% of all described fungal species. Yeasts, such as Candida albicans, are opportunistic pathogens and can cause infections in humans.
[10] Which of the following is not connective tissue?
A.
Bone
B.
Cartilage
C.
Blood
D.
Skeletal muscle
Ans:
Skeletal muscle
Explanation :
Skeletal muscle is a form of striated muscle tissue which is under the voluntary control of the somatic nervous system. Most skeletal muscles are attached to bones by bundles of collagen fibers known as tendons. It is one of three major muscle types, the others being cardiac muscle and smooth muscle.
[11] The hormone that stimulates heart beat is -
A.
Thyroxine
B.
Gastrin
C.
Glycogen
D.
Dopamine
Ans:
Thyroxine
Explanation :
Thyroxine is the main hormone secreted into the bloodstream by the thyroid gland. It plays vital roles in digestion, heart and muscle function, brain development and maintenance of bones. It increases heart rate, cardiac contractility and cardiac output and also promotes vasodilation, which leads to enhanced blood flow to many organs.
[12] Which of the following gas leaked in the Bhopal Gas tragedy in December 1984?
A.
Methyl isocyanate
B.
Methyl isochlorate
C.
Methyl phosphate
D.
Methyl isopropate
Ans:
Methyl isocyanate
Explanation :
In the gas tragedy that occurred at the Union Carbide India Limited pesticide plant in Bhopal, Madhya Pradesh, on 2-3 December 1984, over 500,000 people were exposed to toxic methyl isocyanate (MIC) gas and other chemicals. An estimated 10,000 or more people died.
[13] The disease Beri Beri is caused due to the deficiency of which of the following?
A.
Vitamin B2
B.
Vitamin B1
C.
Vitamin B12
D.
Vitamin E
Ans:
Vitamin B1
Explanation :
Beriberi is a disease caused by a vitamin B1 (thiamine) deficiency. There are two types of the disease: wet beriberi and dry beriberi. Wet beriberi affects the heart and circulatory system. In extreme cases, wet beriberi can cause heart failure. Dry beriberi damages the nerves and can lead to a loss of muscle strength and eventually, muscle paralysis.
[14] Excessive secretion from the pituitary gland in children results in -
A.
increased height
B.
retarded growth
C.
weakening of bones
D.
None of the above
Ans:
increased height
Explanation :
Excessive secretion from the pituitary gland in the children results in increased height. In children and adolescents, excessive levels of growth hormone can result in a condition called gigantism. Children with this condition may have unusually long arms and legs and may grow to heights of 7 to 8 feet or more.
[15] Which one of the following is known as the ‘immovable property’ in the cell?
A.
Carbohydrate
B.
Fat
C.
Protein
D.
Nucleic acid
Ans:
Nucleic acid
Explanation :
Nucleic acids are large biological molecules essential for all known forms of life. They include DNA (deoxyribonucleic acid) and RNA (ribonucleic acid). Immovable property is an immovable object, an item of property that cannot be moved without destroying or altering it – property that is fixed to the earth, such as land or a house.
[16] Ozone protects biosphere from -
A.
X-rays
B.
Gamma rays
C.
Ultraviolet rays
D.
Infrared rays
Ans:
Ultraviolet rays
Explanation :
Ozone is an allotrope of oxygen that is formed from dioxygen by the action of ultraviolet light and also atmospheric electrical discharges. The ozone layer in the stratosphere acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects.
[17] Omithophily is effected by -
A.
snails
B.
bats
C.
insects
D.
birds
Ans:
birds
Explanation :
Omithophily or bird pollination is the pollination of flowering plants by birds. This coevolutionary association is derived from insect pollination (entomophily) and is particularly well developed in some parts of the world, especially in the tropics and on some island chains.
[18] The xylem in plants are responsible for -
A.
transport of water
B.
transport of food
C.
transport of amino acids
D.
transport of oxygen
Ans:
transport of water
Explanation :
Xylem is one of the two types of transport tissue in vascular plants, phloem being the other. The basic function of xylem is to transport water from roots to shoot and leaves, but it also transports some dissolved nutrients. Together with phloem (tissue that conducts sugars from the leaves to the rest of the plant), xylem is found in all vascular plants.
[19] Which of the following bacterium causes crown gall disease in plants?
A.
Bacillus thurigiensis
B.
Agrobacterium tumefaciens
C.
Pseudomonas fluorescens
D.
None of these
Ans:
Agrobacterium tumefaciens
Explanation :
Crown gall is a disease caused by the bacterium Agrobacterium tumefaciens (synonym Rhizobium radiobacter), which enters the plant through wounds in roots or stems and stimulates the plant tissues to grow in a disorganized way, producing swollen galls. As the disease progresses, plants lose vigour and may eventually die.
[20] Blood is red in colour due to the presence of -
A.
Cytochrome
B.
Chlorophyll
C.
Hemocyanin
D.
Haemoglobin
Ans:
Haemoglobin
Explanation :
The red color of blood comes from the hemoglobin that makes up the majority of the mass of the cell, which allows the blood cell to carry oxygen around the body. The plasma itself is a straw color when viewed under a microscope, but the hemoglobin makes up so much of the blood cell that its red color overpowers the color of the plasma.
[21] Which one of the following events in a botanical garden is never directly influenced by light?
A.
Flowering
B.
Photosynthesis
C.
Transpiration
D.
Fertilization
Ans:
Fertilization
Explanation :
Fertilization in plants is not directly influenced by sunlight. It occurs when pollen grains are transported from anthers to stigma. When ripe pollen from an anther catches on the stigma of the same kind of flower, each pollen grain sends out a small thread-like tube. Fertilization occurs after pollination, when pollen grains land on the stigma of a flower of the same species. During this time, a series of events take place leading to the formation of seeds.
[22] Which mosquito is the carrier of Zika virus?
A.
Culex
B.
Aedes
C.
Anopheles
D.
Culiseta
Ans:
Aedes
Explanation :
Zika virus (ZIKV) is a member of the virus family Flaviviridae is spread by daytime-active Aedes mosquitoes, such as A. aegypti and A. albopictus. Its name comes from the Zika Forest of Uganda, where the virus was first isolated in 1947. Zika virus is related to the dengue, yellow fever, Japanese encephalitis, and West Nile viruses.
[23] Root cap is derived from -
A.
Derm atogen
B.
Calyptrogen
C.
Protoderm
D.
Histogen
Ans:
Calyptrogen
Explanation :
Calyptrogen is a layer of rapidly dividing cells at the tip of a plant root, from which the root cap is formed. It occurs in grasses and many other plants. The root cap is formed by several layers of cells that envelop the root tip externally. This covering of cells, of which the outermost ones are dead, envelops and protects the growing tip very much as a thimble protects the finger.
[24] percent of Delhites are suffering from Asthma and Rhinitis.
A.
0.13
B.
0.1
C.
0.11
D.
0.12
Ans:
0.11
Explanation :
As per a recent survey conducted by Vallabhbhai Patel Chest Institute Delhi, more than an 11% of Delhiites are suffering from asthma and rhinitis. As per the survey, 11.69% were found to be suffering from rhinitis and 11.03% from asthma.
[25] A group of genes whose activity is coordinated by a DNA site is -
A.
operon
B.
cistron
C.
polysome
D.
polypeptide
Ans:
operon
Explanation :
The operon is defined as a group of genes whose activity is coordinated by a DNA site. An operon i s a functioning unit of genomic DNA containing a cluster of genes under the control of a single promoter. The genes are transcribed together into an mRNA strand and either translated together in the cytoplasm, or undergo trans-splicing to create monocistronic mR-NAs that are translated separately.
Explanation :
The kidneys are bean-shaped organs that serve several excretory roles apart from the essential regulatory roles in mammals. They remove from the blood the nitrogenous wastes such as urea, as well as salts and excess water, and excrete them in the form of urine. In producing urine, the kidneys excrete nitrogenous wastes such as urea and ammonium.
[6] Who among the following is credited with starting the work on plant tissue culture?
A.
F.C. Steward
B.
P. Maheshwari
C.
P.R. White
D.
Haberlandt
Ans:
Haberlandt
Explanation :
G. Haberlandt, a German botanist, in 1902 cultured fully differentiated plant cells isolated from different plants. This was the very first step for the beginning of plant cell and tissue culture. Further contributions were made by the Cell Doctrine which admitted that a cell is capable of showing totipotency.
[7] Spraying of DDT on crops causes pollution of _.
A.
Air & Soil
B.
Crops & Air
C.
Soil & Water
D.
Air & Water
Ans:
Soil & Water
Explanation :
DDT is a persistent organic pollutant that is readily adsorbed to soils and sediments, which can act both as sinks and as long-term sources of exposure affecting organisms. Besides, spraying pesticides like DDT on plants pollutes the ground water system which contaminates the entire food chain by severely affecting humans dependent on these.
[8] Which cells in pancreas produce Insulin?
A.
Thymus
B.
Estrogen
C.
Corpus epididymis
D.
Islets of Langerhans
Ans:
Islets of Langerhans
Explanation :
The islets of Langerhans are the regions of the pancreas that contain cells that produce hormones. There are five types of cells in the islets of Langerhans: beta cells secrete insulin; alpha cells secrete glucagon; PP cells secrete pancreatic polypeptide; delta cells secrete somatostatin; and epsilon cells secrete ghrelin.
[9] Yeast is a .
A.
Bacteria
B.
Fungi
C.
Algae
D.
Bryophyte
Ans:
Fungi
Explanation :
Yeast are eukaryotic, single-celled microorganisms classified as members of the fungus kingdom. They are estimated to constitute 1% of all described fungal species. Yeasts, such as Candida albicans, are opportunistic pathogens and can cause infections in humans.
[10] Which of the following is not connective tissue?
A.
Bone
B.
Cartilage
C.
Blood
D.
Skeletal muscle
Ans:
Skeletal muscle
Explanation :
Skeletal muscle is a form of striated muscle tissue which is under the voluntary control of the somatic nervous system. Most skeletal muscles are attached to bones by bundles of collagen fibers known as tendons. It is one of three major muscle types, the others being cardiac muscle and smooth muscle.
[11] The hormone that stimulates heart beat is -
A.
Thyroxine
B.
Gastrin
C.
Glycogen
D.
Dopamine
Ans:
Thyroxine
Explanation :
Thyroxine is the main hormone secreted into the bloodstream by the thyroid gland. It plays vital roles in digestion, heart and muscle function, brain development and maintenance of bones. It increases heart rate, cardiac contractility and cardiac output and also promotes vasodilation, which leads to enhanced blood flow to many organs.
[12] Which of the following gas leaked in the Bhopal Gas tragedy in December 1984?
A.
Methyl isocyanate
B.
Methyl isochlorate
C.
Methyl phosphate
D.
Methyl isopropate
Ans:
Methyl isocyanate
Explanation :
In the gas tragedy that occurred at the Union Carbide India Limited pesticide plant in Bhopal, Madhya Pradesh, on 2-3 December 1984, over 500,000 people were exposed to toxic methyl isocyanate (MIC) gas and other chemicals. An estimated 10,000 or more people died.
[13] The disease Beri Beri is caused due to the deficiency of which of the following?
A.
Vitamin B2
B.
Vitamin B1
C.
Vitamin B12
D.
Vitamin E
Ans:
Vitamin B1
Explanation :
Beriberi is a disease caused by a vitamin B1 (thiamine) deficiency. There are two types of the disease: wet beriberi and dry beriberi. Wet beriberi affects the heart and circulatory system. In extreme cases, wet beriberi can cause heart failure. Dry beriberi damages the nerves and can lead to a loss of muscle strength and eventually, muscle paralysis.
[14] Excessive secretion from the pituitary gland in children results in -
A.
increased height
B.
retarded growth
C.
weakening of bones
D.
None of the above
Ans:
increased height
Explanation :
Excessive secretion from the pituitary gland in the children results in increased height. In children and adolescents, excessive levels of growth hormone can result in a condition called gigantism. Children with this condition may have unusually long arms and legs and may grow to heights of 7 to 8 feet or more.
[15] Which one of the following is known as the ‘immovable property’ in the cell?
A.
Carbohydrate
B.
Fat
C.
Protein
D.
Nucleic acid
Ans:
Nucleic acid
Explanation :
Nucleic acids are large biological molecules essential for all known forms of life. They include DNA (deoxyribonucleic acid) and RNA (ribonucleic acid). Immovable property is an immovable object, an item of property that cannot be moved without destroying or altering it – property that is fixed to the earth, such as land or a house.
[16] Ozone protects biosphere from -
A.
X-rays
B.
Gamma rays
C.
Ultraviolet rays
D.
Infrared rays
Ans:
Ultraviolet rays
Explanation :
Ozone is an allotrope of oxygen that is formed from dioxygen by the action of ultraviolet light and also atmospheric electrical discharges. The ozone layer in the stratosphere acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects.
[17] Omithophily is effected by -
A.
snails
B.
bats
C.
insects
D.
birds
Ans:
birds
Explanation :
Omithophily or bird pollination is the pollination of flowering plants by birds. This coevolutionary association is derived from insect pollination (entomophily) and is particularly well developed in some parts of the world, especially in the tropics and on some island chains.
[18] The xylem in plants are responsible for -
A.
transport of water
B.
transport of food
C.
transport of amino acids
D.
transport of oxygen
Ans:
transport of water
Explanation :
Xylem is one of the two types of transport tissue in vascular plants, phloem being the other. The basic function of xylem is to transport water from roots to shoot and leaves, but it also transports some dissolved nutrients. Together with phloem (tissue that conducts sugars from the leaves to the rest of the plant), xylem is found in all vascular plants.
[19] Which of the following bacterium causes crown gall disease in plants?
A.
Bacillus thurigiensis
B.
Agrobacterium tumefaciens
C.
Pseudomonas fluorescens
D.
None of these
Ans:
Agrobacterium tumefaciens
Explanation :
Crown gall is a disease caused by the bacterium Agrobacterium tumefaciens (synonym Rhizobium radiobacter), which enters the plant through wounds in roots or stems and stimulates the plant tissues to grow in a disorganized way, producing swollen galls. As the disease progresses, plants lose vigour and may eventually die.
[20] Blood is red in colour due to the presence of -
A.
Cytochrome
B.
Chlorophyll
C.
Hemocyanin
D.
Haemoglobin
Ans:
Haemoglobin
Explanation :
The red color of blood comes from the hemoglobin that makes up the majority of the mass of the cell, which allows the blood cell to carry oxygen around the body. The plasma itself is a straw color when viewed under a microscope, but the hemoglobin makes up so much of the blood cell that its red color overpowers the color of the plasma.
[21] Which one of the following events in a botanical garden is never directly influenced by light?
A.
Flowering
B.
Photosynthesis
C.
Transpiration
D.
Fertilization
Ans:
Fertilization
Explanation :
Fertilization in plants is not directly influenced by sunlight. It occurs when pollen grains are transported from anthers to stigma. When ripe pollen from an anther catches on the stigma of the same kind of flower, each pollen grain sends out a small thread-like tube. Fertilization occurs after pollination, when pollen grains land on the stigma of a flower of the same species. During this time, a series of events take place leading to the formation of seeds.
[22] Which mosquito is the carrier of Zika virus?
A.
Culex
B.
Aedes
C.
Anopheles
D.
Culiseta
Ans:
Aedes
Explanation :
Zika virus (ZIKV) is a member of the virus family Flaviviridae is spread by daytime-active Aedes mosquitoes, such as A. aegypti and A. albopictus. Its name comes from the Zika Forest of Uganda, where the virus was first isolated in 1947. Zika virus is related to the dengue, yellow fever, Japanese encephalitis, and West Nile viruses.
[23] Root cap is derived from -
A.
Derm atogen
B.
Calyptrogen
C.
Protoderm
D.
Histogen
Ans:
Calyptrogen
Explanation :
Calyptrogen is a layer of rapidly dividing cells at the tip of a plant root, from which the root cap is formed. It occurs in grasses and many other plants. The root cap is formed by several layers of cells that envelop the root tip externally. This covering of cells, of which the outermost ones are dead, envelops and protects the growing tip very much as a thimble protects the finger.
[24] percent of Delhites are suffering from Asthma and Rhinitis.
A.
0.13
B.
0.1
C.
0.11
D.
0.12
Ans:
0.11
Explanation :
As per a recent survey conducted by Vallabhbhai Patel Chest Institute Delhi, more than an 11% of Delhiites are suffering from asthma and rhinitis. As per the survey, 11.69% were found to be suffering from rhinitis and 11.03% from asthma.
[25] A group of genes whose activity is coordinated by a DNA site is -
A.
operon
B.
cistron
C.
polysome
D.
polypeptide
Ans:
operon
Explanation :
The operon is defined as a group of genes whose activity is coordinated by a DNA site. An operon i s a functioning unit of genomic DNA containing a cluster of genes under the control of a single promoter. The genes are transcribed together into an mRNA strand and either translated together in the cytoplasm, or undergo trans-splicing to create monocistronic mR-NAs that are translated separately.
Explanation :
DDT is a persistent organic pollutant that is readily adsorbed to soils and sediments, which can act both as sinks and as long-term sources of exposure affecting organisms. Besides, spraying pesticides like DDT on plants pollutes the ground water system which contaminates the entire food chain by severely affecting humans dependent on these.
[8] Which cells in pancreas produce Insulin?
A.
Thymus
B.
Estrogen
C.
Corpus epididymis
D.
Islets of Langerhans
Ans:
Islets of Langerhans
Explanation :
The islets of Langerhans are the regions of the pancreas that contain cells that produce hormones. There are five types of cells in the islets of Langerhans: beta cells secrete insulin; alpha cells secrete glucagon; PP cells secrete pancreatic polypeptide; delta cells secrete somatostatin; and epsilon cells secrete ghrelin.
[9] Yeast is a .
A.
Bacteria
B.
Fungi
C.
Algae
D.
Bryophyte
Ans:
Fungi
Explanation :
Yeast are eukaryotic, single-celled microorganisms classified as members of the fungus kingdom. They are estimated to constitute 1% of all described fungal species. Yeasts, such as Candida albicans, are opportunistic pathogens and can cause infections in humans.
[10] Which of the following is not connective tissue?
A.
Bone
B.
Cartilage
C.
Blood
D.
Skeletal muscle
Ans:
Skeletal muscle
Explanation :
Skeletal muscle is a form of striated muscle tissue which is under the voluntary control of the somatic nervous system. Most skeletal muscles are attached to bones by bundles of collagen fibers known as tendons. It is one of three major muscle types, the others being cardiac muscle and smooth muscle.
[11] The hormone that stimulates heart beat is -
A.
Thyroxine
B.
Gastrin
C.
Glycogen
D.
Dopamine
Ans:
Thyroxine
Explanation :
Thyroxine is the main hormone secreted into the bloodstream by the thyroid gland. It plays vital roles in digestion, heart and muscle function, brain development and maintenance of bones. It increases heart rate, cardiac contractility and cardiac output and also promotes vasodilation, which leads to enhanced blood flow to many organs.
[12] Which of the following gas leaked in the Bhopal Gas tragedy in December 1984?
A.
Methyl isocyanate
B.
Methyl isochlorate
C.
Methyl phosphate
D.
Methyl isopropate
Ans:
Methyl isocyanate
Explanation :
In the gas tragedy that occurred at the Union Carbide India Limited pesticide plant in Bhopal, Madhya Pradesh, on 2-3 December 1984, over 500,000 people were exposed to toxic methyl isocyanate (MIC) gas and other chemicals. An estimated 10,000 or more people died.
[13] The disease Beri Beri is caused due to the deficiency of which of the following?
A.
Vitamin B2
B.
Vitamin B1
C.
Vitamin B12
D.
Vitamin E
Ans:
Vitamin B1
Explanation :
Beriberi is a disease caused by a vitamin B1 (thiamine) deficiency. There are two types of the disease: wet beriberi and dry beriberi. Wet beriberi affects the heart and circulatory system. In extreme cases, wet beriberi can cause heart failure. Dry beriberi damages the nerves and can lead to a loss of muscle strength and eventually, muscle paralysis.
[14] Excessive secretion from the pituitary gland in children results in -
A.
increased height
B.
retarded growth
C.
weakening of bones
D.
None of the above
Ans:
increased height
Explanation :
Excessive secretion from the pituitary gland in the children results in increased height. In children and adolescents, excessive levels of growth hormone can result in a condition called gigantism. Children with this condition may have unusually long arms and legs and may grow to heights of 7 to 8 feet or more.
[15] Which one of the following is known as the ‘immovable property’ in the cell?
A.
Carbohydrate
B.
Fat
C.
Protein
D.
Nucleic acid
Ans:
Nucleic acid
Explanation :
Nucleic acids are large biological molecules essential for all known forms of life. They include DNA (deoxyribonucleic acid) and RNA (ribonucleic acid). Immovable property is an immovable object, an item of property that cannot be moved without destroying or altering it – property that is fixed to the earth, such as land or a house.
[16] Ozone protects biosphere from -
A.
X-rays
B.
Gamma rays
C.
Ultraviolet rays
D.
Infrared rays
Ans:
Ultraviolet rays
Explanation :
Ozone is an allotrope of oxygen that is formed from dioxygen by the action of ultraviolet light and also atmospheric electrical discharges. The ozone layer in the stratosphere acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects.
[17] Omithophily is effected by -
A.
snails
B.
bats
C.
insects
D.
birds
Ans:
birds
Explanation :
Omithophily or bird pollination is the pollination of flowering plants by birds. This coevolutionary association is derived from insect pollination (entomophily) and is particularly well developed in some parts of the world, especially in the tropics and on some island chains.
[18] The xylem in plants are responsible for -
A.
transport of water
B.
transport of food
C.
transport of amino acids
D.
transport of oxygen
Ans:
transport of water
Explanation :
Xylem is one of the two types of transport tissue in vascular plants, phloem being the other. The basic function of xylem is to transport water from roots to shoot and leaves, but it also transports some dissolved nutrients. Together with phloem (tissue that conducts sugars from the leaves to the rest of the plant), xylem is found in all vascular plants.
[19] Which of the following bacterium causes crown gall disease in plants?
A.
Bacillus thurigiensis
B.
Agrobacterium tumefaciens
C.
Pseudomonas fluorescens
D.
None of these
Ans:
Agrobacterium tumefaciens
Explanation :
Crown gall is a disease caused by the bacterium Agrobacterium tumefaciens (synonym Rhizobium radiobacter), which enters the plant through wounds in roots or stems and stimulates the plant tissues to grow in a disorganized way, producing swollen galls. As the disease progresses, plants lose vigour and may eventually die.
[20] Blood is red in colour due to the presence of -
A.
Cytochrome
B.
Chlorophyll
C.
Hemocyanin
D.
Haemoglobin
Ans:
Haemoglobin
Explanation :
The red color of blood comes from the hemoglobin that makes up the majority of the mass of the cell, which allows the blood cell to carry oxygen around the body. The plasma itself is a straw color when viewed under a microscope, but the hemoglobin makes up so much of the blood cell that its red color overpowers the color of the plasma.
[21] Which one of the following events in a botanical garden is never directly influenced by light?
A.
Flowering
B.
Photosynthesis
C.
Transpiration
D.
Fertilization
Ans:
Fertilization
Explanation :
Fertilization in plants is not directly influenced by sunlight. It occurs when pollen grains are transported from anthers to stigma. When ripe pollen from an anther catches on the stigma of the same kind of flower, each pollen grain sends out a small thread-like tube. Fertilization occurs after pollination, when pollen grains land on the stigma of a flower of the same species. During this time, a series of events take place leading to the formation of seeds.
[22] Which mosquito is the carrier of Zika virus?
A.
Culex
B.
Aedes
C.
Anopheles
D.
Culiseta
Ans:
Aedes
Explanation :
Zika virus (ZIKV) is a member of the virus family Flaviviridae is spread by daytime-active Aedes mosquitoes, such as A. aegypti and A. albopictus. Its name comes from the Zika Forest of Uganda, where the virus was first isolated in 1947. Zika virus is related to the dengue, yellow fever, Japanese encephalitis, and West Nile viruses.
[23] Root cap is derived from -
A.
Derm atogen
B.
Calyptrogen
C.
Protoderm
D.
Histogen
Ans:
Calyptrogen
Explanation :
Calyptrogen is a layer of rapidly dividing cells at the tip of a plant root, from which the root cap is formed. It occurs in grasses and many other plants. The root cap is formed by several layers of cells that envelop the root tip externally. This covering of cells, of which the outermost ones are dead, envelops and protects the growing tip very much as a thimble protects the finger.
[24] percent of Delhites are suffering from Asthma and Rhinitis.
A.
0.13
B.
0.1
C.
0.11
D.
0.12
Ans:
0.11
Explanation :
As per a recent survey conducted by Vallabhbhai Patel Chest Institute Delhi, more than an 11% of Delhiites are suffering from asthma and rhinitis. As per the survey, 11.69% were found to be suffering from rhinitis and 11.03% from asthma.
[25] A group of genes whose activity is coordinated by a DNA site is -
A.
operon
B.
cistron
C.
polysome
D.
polypeptide
Ans:
operon
Explanation :
The operon is defined as a group of genes whose activity is coordinated by a DNA site. An operon i s a functioning unit of genomic DNA containing a cluster of genes under the control of a single promoter. The genes are transcribed together into an mRNA strand and either translated together in the cytoplasm, or undergo trans-splicing to create monocistronic mR-NAs that are translated separately.
Explanation :
Yeast are eukaryotic, single-celled microorganisms classified as members of the fungus kingdom. They are estimated to constitute 1% of all described fungal species. Yeasts, such as Candida albicans, are opportunistic pathogens and can cause infections in humans.
[10] Which of the following is not connective tissue?
A.
Bone
B.
Cartilage
C.
Blood
D.
Skeletal muscle
Ans:
Skeletal muscle
Explanation :
Skeletal muscle is a form of striated muscle tissue which is under the voluntary control of the somatic nervous system. Most skeletal muscles are attached to bones by bundles of collagen fibers known as tendons. It is one of three major muscle types, the others being cardiac muscle and smooth muscle.
[11] The hormone that stimulates heart beat is -
A.
Thyroxine
B.
Gastrin
C.
Glycogen
D.
Dopamine
Ans:
Thyroxine
Explanation :
Thyroxine is the main hormone secreted into the bloodstream by the thyroid gland. It plays vital roles in digestion, heart and muscle function, brain development and maintenance of bones. It increases heart rate, cardiac contractility and cardiac output and also promotes vasodilation, which leads to enhanced blood flow to many organs.
[12] Which of the following gas leaked in the Bhopal Gas tragedy in December 1984?
A.
Methyl isocyanate
B.
Methyl isochlorate
C.
Methyl phosphate
D.
Methyl isopropate
Ans:
Methyl isocyanate
Explanation :
In the gas tragedy that occurred at the Union Carbide India Limited pesticide plant in Bhopal, Madhya Pradesh, on 2-3 December 1984, over 500,000 people were exposed to toxic methyl isocyanate (MIC) gas and other chemicals. An estimated 10,000 or more people died.
[13] The disease Beri Beri is caused due to the deficiency of which of the following?
A.
Vitamin B2
B.
Vitamin B1
C.
Vitamin B12
D.
Vitamin E
Ans:
Vitamin B1
Explanation :
Beriberi is a disease caused by a vitamin B1 (thiamine) deficiency. There are two types of the disease: wet beriberi and dry beriberi. Wet beriberi affects the heart and circulatory system. In extreme cases, wet beriberi can cause heart failure. Dry beriberi damages the nerves and can lead to a loss of muscle strength and eventually, muscle paralysis.
[14] Excessive secretion from the pituitary gland in children results in -
A.
increased height
B.
retarded growth
C.
weakening of bones
D.
None of the above
Ans:
increased height
Explanation :
Excessive secretion from the pituitary gland in the children results in increased height. In children and adolescents, excessive levels of growth hormone can result in a condition called gigantism. Children with this condition may have unusually long arms and legs and may grow to heights of 7 to 8 feet or more.
[15] Which one of the following is known as the ‘immovable property’ in the cell?
A.
Carbohydrate
B.
Fat
C.
Protein
D.
Nucleic acid
Ans:
Nucleic acid
Explanation :
Nucleic acids are large biological molecules essential for all known forms of life. They include DNA (deoxyribonucleic acid) and RNA (ribonucleic acid). Immovable property is an immovable object, an item of property that cannot be moved without destroying or altering it – property that is fixed to the earth, such as land or a house.
[16] Ozone protects biosphere from -
A.
X-rays
B.
Gamma rays
C.
Ultraviolet rays
D.
Infrared rays
Ans:
Ultraviolet rays
Explanation :
Ozone is an allotrope of oxygen that is formed from dioxygen by the action of ultraviolet light and also atmospheric electrical discharges. The ozone layer in the stratosphere acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects.
[17] Omithophily is effected by -
A.
snails
B.
bats
C.
insects
D.
birds
Ans:
birds
Explanation :
Omithophily or bird pollination is the pollination of flowering plants by birds. This coevolutionary association is derived from insect pollination (entomophily) and is particularly well developed in some parts of the world, especially in the tropics and on some island chains.
[18] The xylem in plants are responsible for -
A.
transport of water
B.
transport of food
C.
transport of amino acids
D.
transport of oxygen
Ans:
transport of water
Explanation :
Xylem is one of the two types of transport tissue in vascular plants, phloem being the other. The basic function of xylem is to transport water from roots to shoot and leaves, but it also transports some dissolved nutrients. Together with phloem (tissue that conducts sugars from the leaves to the rest of the plant), xylem is found in all vascular plants.
[19] Which of the following bacterium causes crown gall disease in plants?
A.
Bacillus thurigiensis
B.
Agrobacterium tumefaciens
C.
Pseudomonas fluorescens
D.
None of these
Ans:
Agrobacterium tumefaciens
Explanation :
Crown gall is a disease caused by the bacterium Agrobacterium tumefaciens (synonym Rhizobium radiobacter), which enters the plant through wounds in roots or stems and stimulates the plant tissues to grow in a disorganized way, producing swollen galls. As the disease progresses, plants lose vigour and may eventually die.
[20] Blood is red in colour due to the presence of -
A.
Cytochrome
B.
Chlorophyll
C.
Hemocyanin
D.
Haemoglobin
Ans:
Haemoglobin
Explanation :
The red color of blood comes from the hemoglobin that makes up the majority of the mass of the cell, which allows the blood cell to carry oxygen around the body. The plasma itself is a straw color when viewed under a microscope, but the hemoglobin makes up so much of the blood cell that its red color overpowers the color of the plasma.
[21] Which one of the following events in a botanical garden is never directly influenced by light?
A.
Flowering
B.
Photosynthesis
C.
Transpiration
D.
Fertilization
Ans:
Fertilization
Explanation :
Fertilization in plants is not directly influenced by sunlight. It occurs when pollen grains are transported from anthers to stigma. When ripe pollen from an anther catches on the stigma of the same kind of flower, each pollen grain sends out a small thread-like tube. Fertilization occurs after pollination, when pollen grains land on the stigma of a flower of the same species. During this time, a series of events take place leading to the formation of seeds.
[22] Which mosquito is the carrier of Zika virus?
A.
Culex
B.
Aedes
C.
Anopheles
D.
Culiseta
Ans:
Aedes
Explanation :
Zika virus (ZIKV) is a member of the virus family Flaviviridae is spread by daytime-active Aedes mosquitoes, such as A. aegypti and A. albopictus. Its name comes from the Zika Forest of Uganda, where the virus was first isolated in 1947. Zika virus is related to the dengue, yellow fever, Japanese encephalitis, and West Nile viruses.
[23] Root cap is derived from -
A.
Derm atogen
B.
Calyptrogen
C.
Protoderm
D.
Histogen
Ans:
Calyptrogen
Explanation :
Calyptrogen is a layer of rapidly dividing cells at the tip of a plant root, from which the root cap is formed. It occurs in grasses and many other plants. The root cap is formed by several layers of cells that envelop the root tip externally. This covering of cells, of which the outermost ones are dead, envelops and protects the growing tip very much as a thimble protects the finger.
[24] percent of Delhites are suffering from Asthma and Rhinitis.
A.
0.13
B.
0.1
C.
0.11
D.
0.12
Ans:
0.11
Explanation :
As per a recent survey conducted by Vallabhbhai Patel Chest Institute Delhi, more than an 11% of Delhiites are suffering from asthma and rhinitis. As per the survey, 11.69% were found to be suffering from rhinitis and 11.03% from asthma.
[25] A group of genes whose activity is coordinated by a DNA site is -
A.
operon
B.
cistron
C.
polysome
D.
polypeptide
Ans:
operon
Explanation :
The operon is defined as a group of genes whose activity is coordinated by a DNA site. An operon i s a functioning unit of genomic DNA containing a cluster of genes under the control of a single promoter. The genes are transcribed together into an mRNA strand and either translated together in the cytoplasm, or undergo trans-splicing to create monocistronic mR-NAs that are translated separately.
Explanation :
Thyroxine is the main hormone secreted into the bloodstream by the thyroid gland. It plays vital roles in digestion, heart and muscle function, brain development and maintenance of bones. It increases heart rate, cardiac contractility and cardiac output and also promotes vasodilation, which leads to enhanced blood flow to many organs.
[12] Which of the following gas leaked in the Bhopal Gas tragedy in December 1984?
A.
Methyl isocyanate
B.
Methyl isochlorate
C.
Methyl phosphate
D.
Methyl isopropate
Ans:
Methyl isocyanate
Explanation :
In the gas tragedy that occurred at the Union Carbide India Limited pesticide plant in Bhopal, Madhya Pradesh, on 2-3 December 1984, over 500,000 people were exposed to toxic methyl isocyanate (MIC) gas and other chemicals. An estimated 10,000 or more people died.
[13] The disease Beri Beri is caused due to the deficiency of which of the following?
A.
Vitamin B2
B.
Vitamin B1
C.
Vitamin B12
D.
Vitamin E
Ans:
Vitamin B1
Explanation :
Beriberi is a disease caused by a vitamin B1 (thiamine) deficiency. There are two types of the disease: wet beriberi and dry beriberi. Wet beriberi affects the heart and circulatory system. In extreme cases, wet beriberi can cause heart failure. Dry beriberi damages the nerves and can lead to a loss of muscle strength and eventually, muscle paralysis.
[14] Excessive secretion from the pituitary gland in children results in -
A.
increased height
B.
retarded growth
C.
weakening of bones
D.
None of the above
Ans:
increased height
Explanation :
Excessive secretion from the pituitary gland in the children results in increased height. In children and adolescents, excessive levels of growth hormone can result in a condition called gigantism. Children with this condition may have unusually long arms and legs and may grow to heights of 7 to 8 feet or more.
[15] Which one of the following is known as the ‘immovable property’ in the cell?
A.
Carbohydrate
B.
Fat
C.
Protein
D.
Nucleic acid
Ans:
Nucleic acid
Explanation :
Nucleic acids are large biological molecules essential for all known forms of life. They include DNA (deoxyribonucleic acid) and RNA (ribonucleic acid). Immovable property is an immovable object, an item of property that cannot be moved without destroying or altering it – property that is fixed to the earth, such as land or a house.
[16] Ozone protects biosphere from -
A.
X-rays
B.
Gamma rays
C.
Ultraviolet rays
D.
Infrared rays
Ans:
Ultraviolet rays
Explanation :
Ozone is an allotrope of oxygen that is formed from dioxygen by the action of ultraviolet light and also atmospheric electrical discharges. The ozone layer in the stratosphere acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects.
[17] Omithophily is effected by -
A.
snails
B.
bats
C.
insects
D.
birds
Ans:
birds
Explanation :
Omithophily or bird pollination is the pollination of flowering plants by birds. This coevolutionary association is derived from insect pollination (entomophily) and is particularly well developed in some parts of the world, especially in the tropics and on some island chains.
[18] The xylem in plants are responsible for -
A.
transport of water
B.
transport of food
C.
transport of amino acids
D.
transport of oxygen
Ans:
transport of water
Explanation :
Xylem is one of the two types of transport tissue in vascular plants, phloem being the other. The basic function of xylem is to transport water from roots to shoot and leaves, but it also transports some dissolved nutrients. Together with phloem (tissue that conducts sugars from the leaves to the rest of the plant), xylem is found in all vascular plants.
[19] Which of the following bacterium causes crown gall disease in plants?
A.
Bacillus thurigiensis
B.
Agrobacterium tumefaciens
C.
Pseudomonas fluorescens
D.
None of these
Ans:
Agrobacterium tumefaciens
Explanation :
Crown gall is a disease caused by the bacterium Agrobacterium tumefaciens (synonym Rhizobium radiobacter), which enters the plant through wounds in roots or stems and stimulates the plant tissues to grow in a disorganized way, producing swollen galls. As the disease progresses, plants lose vigour and may eventually die.
[20] Blood is red in colour due to the presence of -
A.
Cytochrome
B.
Chlorophyll
C.
Hemocyanin
D.
Haemoglobin
Ans:
Haemoglobin
Explanation :
The red color of blood comes from the hemoglobin that makes up the majority of the mass of the cell, which allows the blood cell to carry oxygen around the body. The plasma itself is a straw color when viewed under a microscope, but the hemoglobin makes up so much of the blood cell that its red color overpowers the color of the plasma.
[21] Which one of the following events in a botanical garden is never directly influenced by light?
A.
Flowering
B.
Photosynthesis
C.
Transpiration
D.
Fertilization
Ans:
Fertilization
Explanation :
Fertilization in plants is not directly influenced by sunlight. It occurs when pollen grains are transported from anthers to stigma. When ripe pollen from an anther catches on the stigma of the same kind of flower, each pollen grain sends out a small thread-like tube. Fertilization occurs after pollination, when pollen grains land on the stigma of a flower of the same species. During this time, a series of events take place leading to the formation of seeds.
[22] Which mosquito is the carrier of Zika virus?
A.
Culex
B.
Aedes
C.
Anopheles
D.
Culiseta
Ans:
Aedes
Explanation :
Zika virus (ZIKV) is a member of the virus family Flaviviridae is spread by daytime-active Aedes mosquitoes, such as A. aegypti and A. albopictus. Its name comes from the Zika Forest of Uganda, where the virus was first isolated in 1947. Zika virus is related to the dengue, yellow fever, Japanese encephalitis, and West Nile viruses.
[23] Root cap is derived from -
A.
Derm atogen
B.
Calyptrogen
C.
Protoderm
D.
Histogen
Ans:
Calyptrogen
Explanation :
Calyptrogen is a layer of rapidly dividing cells at the tip of a plant root, from which the root cap is formed. It occurs in grasses and many other plants. The root cap is formed by several layers of cells that envelop the root tip externally. This covering of cells, of which the outermost ones are dead, envelops and protects the growing tip very much as a thimble protects the finger.
[24] percent of Delhites are suffering from Asthma and Rhinitis.
A.
0.13
B.
0.1
C.
0.11
D.
0.12
Ans:
0.11
Explanation :
As per a recent survey conducted by Vallabhbhai Patel Chest Institute Delhi, more than an 11% of Delhiites are suffering from asthma and rhinitis. As per the survey, 11.69% were found to be suffering from rhinitis and 11.03% from asthma.
[25] A group of genes whose activity is coordinated by a DNA site is -
A.
operon
B.
cistron
C.
polysome
D.
polypeptide
Ans:
operon
Explanation :
The operon is defined as a group of genes whose activity is coordinated by a DNA site. An operon i s a functioning unit of genomic DNA containing a cluster of genes under the control of a single promoter. The genes are transcribed together into an mRNA strand and either translated together in the cytoplasm, or undergo trans-splicing to create monocistronic mR-NAs that are translated separately.
Explanation :
Beriberi is a disease caused by a vitamin B1 (thiamine) deficiency. There are two types of the disease: wet beriberi and dry beriberi. Wet beriberi affects the heart and circulatory system. In extreme cases, wet beriberi can cause heart failure. Dry beriberi damages the nerves and can lead to a loss of muscle strength and eventually, muscle paralysis.
[14] Excessive secretion from the pituitary gland in children results in -
A.
increased height
B.
retarded growth
C.
weakening of bones
D.
None of the above
Ans:
increased height
Explanation :
Excessive secretion from the pituitary gland in the children results in increased height. In children and adolescents, excessive levels of growth hormone can result in a condition called gigantism. Children with this condition may have unusually long arms and legs and may grow to heights of 7 to 8 feet or more.
[15] Which one of the following is known as the ‘immovable property’ in the cell?
A.
Carbohydrate
B.
Fat
C.
Protein
D.
Nucleic acid
Ans:
Nucleic acid
Explanation :
Nucleic acids are large biological molecules essential for all known forms of life. They include DNA (deoxyribonucleic acid) and RNA (ribonucleic acid). Immovable property is an immovable object, an item of property that cannot be moved without destroying or altering it – property that is fixed to the earth, such as land or a house.
[16] Ozone protects biosphere from -
A.
X-rays
B.
Gamma rays
C.
Ultraviolet rays
D.
Infrared rays
Ans:
Ultraviolet rays
Explanation :
Ozone is an allotrope of oxygen that is formed from dioxygen by the action of ultraviolet light and also atmospheric electrical discharges. The ozone layer in the stratosphere acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects.
[17] Omithophily is effected by -
A.
snails
B.
bats
C.
insects
D.
birds
Ans:
birds
Explanation :
Omithophily or bird pollination is the pollination of flowering plants by birds. This coevolutionary association is derived from insect pollination (entomophily) and is particularly well developed in some parts of the world, especially in the tropics and on some island chains.
[18] The xylem in plants are responsible for -
A.
transport of water
B.
transport of food
C.
transport of amino acids
D.
transport of oxygen
Ans:
transport of water
Explanation :
Xylem is one of the two types of transport tissue in vascular plants, phloem being the other. The basic function of xylem is to transport water from roots to shoot and leaves, but it also transports some dissolved nutrients. Together with phloem (tissue that conducts sugars from the leaves to the rest of the plant), xylem is found in all vascular plants.
[19] Which of the following bacterium causes crown gall disease in plants?
A.
Bacillus thurigiensis
B.
Agrobacterium tumefaciens
C.
Pseudomonas fluorescens
D.
None of these
Ans:
Agrobacterium tumefaciens
Explanation :
Crown gall is a disease caused by the bacterium Agrobacterium tumefaciens (synonym Rhizobium radiobacter), which enters the plant through wounds in roots or stems and stimulates the plant tissues to grow in a disorganized way, producing swollen galls. As the disease progresses, plants lose vigour and may eventually die.
[20] Blood is red in colour due to the presence of -
A.
Cytochrome
B.
Chlorophyll
C.
Hemocyanin
D.
Haemoglobin
Ans:
Haemoglobin
Explanation :
The red color of blood comes from the hemoglobin that makes up the majority of the mass of the cell, which allows the blood cell to carry oxygen around the body. The plasma itself is a straw color when viewed under a microscope, but the hemoglobin makes up so much of the blood cell that its red color overpowers the color of the plasma.
[21] Which one of the following events in a botanical garden is never directly influenced by light?
A.
Flowering
B.
Photosynthesis
C.
Transpiration
D.
Fertilization
Ans:
Fertilization
Explanation :
Fertilization in plants is not directly influenced by sunlight. It occurs when pollen grains are transported from anthers to stigma. When ripe pollen from an anther catches on the stigma of the same kind of flower, each pollen grain sends out a small thread-like tube. Fertilization occurs after pollination, when pollen grains land on the stigma of a flower of the same species. During this time, a series of events take place leading to the formation of seeds.
[22] Which mosquito is the carrier of Zika virus?
A.
Culex
B.
Aedes
C.
Anopheles
D.
Culiseta
Ans:
Aedes
Explanation :
Zika virus (ZIKV) is a member of the virus family Flaviviridae is spread by daytime-active Aedes mosquitoes, such as A. aegypti and A. albopictus. Its name comes from the Zika Forest of Uganda, where the virus was first isolated in 1947. Zika virus is related to the dengue, yellow fever, Japanese encephalitis, and West Nile viruses.
[23] Root cap is derived from -
A.
Derm atogen
B.
Calyptrogen
C.
Protoderm
D.
Histogen
Ans:
Calyptrogen
Explanation :
Calyptrogen is a layer of rapidly dividing cells at the tip of a plant root, from which the root cap is formed. It occurs in grasses and many other plants. The root cap is formed by several layers of cells that envelop the root tip externally. This covering of cells, of which the outermost ones are dead, envelops and protects the growing tip very much as a thimble protects the finger.
[24] percent of Delhites are suffering from Asthma and Rhinitis.
A.
0.13
B.
0.1
C.
0.11
D.
0.12
Ans:
0.11
Explanation :
As per a recent survey conducted by Vallabhbhai Patel Chest Institute Delhi, more than an 11% of Delhiites are suffering from asthma and rhinitis. As per the survey, 11.69% were found to be suffering from rhinitis and 11.03% from asthma.
[25] A group of genes whose activity is coordinated by a DNA site is -
A.
operon
B.
cistron
C.
polysome
D.
polypeptide
Ans:
operon
Explanation :
The operon is defined as a group of genes whose activity is coordinated by a DNA site. An operon i s a functioning unit of genomic DNA containing a cluster of genes under the control of a single promoter. The genes are transcribed together into an mRNA strand and either translated together in the cytoplasm, or undergo trans-splicing to create monocistronic mR-NAs that are translated separately.
Explanation :
Nucleic acids are large biological molecules essential for all known forms of life. They include DNA (deoxyribonucleic acid) and RNA (ribonucleic acid). Immovable property is an immovable object, an item of property that cannot be moved without destroying or altering it – property that is fixed to the earth, such as land or a house.
[16] Ozone protects biosphere from -
A.
X-rays
B.
Gamma rays
C.
Ultraviolet rays
D.
Infrared rays
Ans:
Ultraviolet rays
Explanation :
Ozone is an allotrope of oxygen that is formed from dioxygen by the action of ultraviolet light and also atmospheric electrical discharges. The ozone layer in the stratosphere acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects.
[17] Omithophily is effected by -
A.
snails
B.
bats
C.
insects
D.
birds
Ans:
birds
Explanation :
Omithophily or bird pollination is the pollination of flowering plants by birds. This coevolutionary association is derived from insect pollination (entomophily) and is particularly well developed in some parts of the world, especially in the tropics and on some island chains.
[18] The xylem in plants are responsible for -
A.
transport of water
B.
transport of food
C.
transport of amino acids
D.
transport of oxygen
Ans:
transport of water
Explanation :
Xylem is one of the two types of transport tissue in vascular plants, phloem being the other. The basic function of xylem is to transport water from roots to shoot and leaves, but it also transports some dissolved nutrients. Together with phloem (tissue that conducts sugars from the leaves to the rest of the plant), xylem is found in all vascular plants.
[19] Which of the following bacterium causes crown gall disease in plants?
A.
Bacillus thurigiensis
B.
Agrobacterium tumefaciens
C.
Pseudomonas fluorescens
D.
None of these
Ans:
Agrobacterium tumefaciens
Explanation :
Crown gall is a disease caused by the bacterium Agrobacterium tumefaciens (synonym Rhizobium radiobacter), which enters the plant through wounds in roots or stems and stimulates the plant tissues to grow in a disorganized way, producing swollen galls. As the disease progresses, plants lose vigour and may eventually die.
[20] Blood is red in colour due to the presence of -
A.
Cytochrome
B.
Chlorophyll
C.
Hemocyanin
D.
Haemoglobin
Ans:
Haemoglobin
Explanation :
The red color of blood comes from the hemoglobin that makes up the majority of the mass of the cell, which allows the blood cell to carry oxygen around the body. The plasma itself is a straw color when viewed under a microscope, but the hemoglobin makes up so much of the blood cell that its red color overpowers the color of the plasma.
[21] Which one of the following events in a botanical garden is never directly influenced by light?
A.
Flowering
B.
Photosynthesis
C.
Transpiration
D.
Fertilization
Ans:
Fertilization
Explanation :
Fertilization in plants is not directly influenced by sunlight. It occurs when pollen grains are transported from anthers to stigma. When ripe pollen from an anther catches on the stigma of the same kind of flower, each pollen grain sends out a small thread-like tube. Fertilization occurs after pollination, when pollen grains land on the stigma of a flower of the same species. During this time, a series of events take place leading to the formation of seeds.
[22] Which mosquito is the carrier of Zika virus?
A.
Culex
B.
Aedes
C.
Anopheles
D.
Culiseta
Ans:
Aedes
Explanation :
Zika virus (ZIKV) is a member of the virus family Flaviviridae is spread by daytime-active Aedes mosquitoes, such as A. aegypti and A. albopictus. Its name comes from the Zika Forest of Uganda, where the virus was first isolated in 1947. Zika virus is related to the dengue, yellow fever, Japanese encephalitis, and West Nile viruses.
[23] Root cap is derived from -
A.
Derm atogen
B.
Calyptrogen
C.
Protoderm
D.
Histogen
Ans:
Calyptrogen
Explanation :
Calyptrogen is a layer of rapidly dividing cells at the tip of a plant root, from which the root cap is formed. It occurs in grasses and many other plants. The root cap is formed by several layers of cells that envelop the root tip externally. This covering of cells, of which the outermost ones are dead, envelops and protects the growing tip very much as a thimble protects the finger.
[24] percent of Delhites are suffering from Asthma and Rhinitis.
A.
0.13
B.
0.1
C.
0.11
D.
0.12
Ans:
0.11
Explanation :
As per a recent survey conducted by Vallabhbhai Patel Chest Institute Delhi, more than an 11% of Delhiites are suffering from asthma and rhinitis. As per the survey, 11.69% were found to be suffering from rhinitis and 11.03% from asthma.
[25] A group of genes whose activity is coordinated by a DNA site is -
A.
operon
B.
cistron
C.
polysome
D.
polypeptide
Ans:
operon
Explanation :
The operon is defined as a group of genes whose activity is coordinated by a DNA site. An operon i s a functioning unit of genomic DNA containing a cluster of genes under the control of a single promoter. The genes are transcribed together into an mRNA strand and either translated together in the cytoplasm, or undergo trans-splicing to create monocistronic mR-NAs that are translated separately.
Explanation :
Omithophily or bird pollination is the pollination of flowering plants by birds. This coevolutionary association is derived from insect pollination (entomophily) and is particularly well developed in some parts of the world, especially in the tropics and on some island chains.
[18] The xylem in plants are responsible for -
A.
transport of water
B.
transport of food
C.
transport of amino acids
D.
transport of oxygen
Ans:
transport of water
Explanation :
Xylem is one of the two types of transport tissue in vascular plants, phloem being the other. The basic function of xylem is to transport water from roots to shoot and leaves, but it also transports some dissolved nutrients. Together with phloem (tissue that conducts sugars from the leaves to the rest of the plant), xylem is found in all vascular plants.
[19] Which of the following bacterium causes crown gall disease in plants?
A.
Bacillus thurigiensis
B.
Agrobacterium tumefaciens
C.
Pseudomonas fluorescens
D.
None of these
Ans:
Agrobacterium tumefaciens
Explanation :
Crown gall is a disease caused by the bacterium Agrobacterium tumefaciens (synonym Rhizobium radiobacter), which enters the plant through wounds in roots or stems and stimulates the plant tissues to grow in a disorganized way, producing swollen galls. As the disease progresses, plants lose vigour and may eventually die.
[20] Blood is red in colour due to the presence of -
A.
Cytochrome
B.
Chlorophyll
C.
Hemocyanin
D.
Haemoglobin
Ans:
Haemoglobin
Explanation :
The red color of blood comes from the hemoglobin that makes up the majority of the mass of the cell, which allows the blood cell to carry oxygen around the body. The plasma itself is a straw color when viewed under a microscope, but the hemoglobin makes up so much of the blood cell that its red color overpowers the color of the plasma.
[21] Which one of the following events in a botanical garden is never directly influenced by light?
A.
Flowering
B.
Photosynthesis
C.
Transpiration
D.
Fertilization
Ans:
Fertilization
Explanation :
Fertilization in plants is not directly influenced by sunlight. It occurs when pollen grains are transported from anthers to stigma. When ripe pollen from an anther catches on the stigma of the same kind of flower, each pollen grain sends out a small thread-like tube. Fertilization occurs after pollination, when pollen grains land on the stigma of a flower of the same species. During this time, a series of events take place leading to the formation of seeds.
[22] Which mosquito is the carrier of Zika virus?
A.
Culex
B.
Aedes
C.
Anopheles
D.
Culiseta
Ans:
Aedes
Explanation :
Zika virus (ZIKV) is a member of the virus family Flaviviridae is spread by daytime-active Aedes mosquitoes, such as A. aegypti and A. albopictus. Its name comes from the Zika Forest of Uganda, where the virus was first isolated in 1947. Zika virus is related to the dengue, yellow fever, Japanese encephalitis, and West Nile viruses.
[23] Root cap is derived from -
A.
Derm atogen
B.
Calyptrogen
C.
Protoderm
D.
Histogen
Ans:
Calyptrogen
Explanation :
Calyptrogen is a layer of rapidly dividing cells at the tip of a plant root, from which the root cap is formed. It occurs in grasses and many other plants. The root cap is formed by several layers of cells that envelop the root tip externally. This covering of cells, of which the outermost ones are dead, envelops and protects the growing tip very much as a thimble protects the finger.
[24] percent of Delhites are suffering from Asthma and Rhinitis.
A.
0.13
B.
0.1
C.
0.11
D.
0.12
Ans:
0.11
Explanation :
As per a recent survey conducted by Vallabhbhai Patel Chest Institute Delhi, more than an 11% of Delhiites are suffering from asthma and rhinitis. As per the survey, 11.69% were found to be suffering from rhinitis and 11.03% from asthma.
[25] A group of genes whose activity is coordinated by a DNA site is -
A.
operon
B.
cistron
C.
polysome
D.
polypeptide
Ans:
operon
Explanation :
The operon is defined as a group of genes whose activity is coordinated by a DNA site. An operon i s a functioning unit of genomic DNA containing a cluster of genes under the control of a single promoter. The genes are transcribed together into an mRNA strand and either translated together in the cytoplasm, or undergo trans-splicing to create monocistronic mR-NAs that are translated separately.
Explanation :
Crown gall is a disease caused by the bacterium Agrobacterium tumefaciens (synonym Rhizobium radiobacter), which enters the plant through wounds in roots or stems and stimulates the plant tissues to grow in a disorganized way, producing swollen galls. As the disease progresses, plants lose vigour and may eventually die.
[20] Blood is red in colour due to the presence of -
A.
Cytochrome
B.
Chlorophyll
C.
Hemocyanin
D.
Haemoglobin
Ans:
Haemoglobin
Explanation :
The red color of blood comes from the hemoglobin that makes up the majority of the mass of the cell, which allows the blood cell to carry oxygen around the body. The plasma itself is a straw color when viewed under a microscope, but the hemoglobin makes up so much of the blood cell that its red color overpowers the color of the plasma.
[21] Which one of the following events in a botanical garden is never directly influenced by light?
A.
Flowering
B.
Photosynthesis
C.
Transpiration
D.
Fertilization
Ans:
Fertilization
Explanation :
Fertilization in plants is not directly influenced by sunlight. It occurs when pollen grains are transported from anthers to stigma. When ripe pollen from an anther catches on the stigma of the same kind of flower, each pollen grain sends out a small thread-like tube. Fertilization occurs after pollination, when pollen grains land on the stigma of a flower of the same species. During this time, a series of events take place leading to the formation of seeds.
[22] Which mosquito is the carrier of Zika virus?
A.
Culex
B.
Aedes
C.
Anopheles
D.
Culiseta
Ans:
Aedes
Explanation :
Zika virus (ZIKV) is a member of the virus family Flaviviridae is spread by daytime-active Aedes mosquitoes, such as A. aegypti and A. albopictus. Its name comes from the Zika Forest of Uganda, where the virus was first isolated in 1947. Zika virus is related to the dengue, yellow fever, Japanese encephalitis, and West Nile viruses.
[23] Root cap is derived from -
A.
Derm atogen
B.
Calyptrogen
C.
Protoderm
D.
Histogen
Ans:
Calyptrogen
Explanation :
Calyptrogen is a layer of rapidly dividing cells at the tip of a plant root, from which the root cap is formed. It occurs in grasses and many other plants. The root cap is formed by several layers of cells that envelop the root tip externally. This covering of cells, of which the outermost ones are dead, envelops and protects the growing tip very much as a thimble protects the finger.
[24] percent of Delhites are suffering from Asthma and Rhinitis.
A.
0.13
B.
0.1
C.
0.11
D.
0.12
Ans:
0.11
Explanation :
As per a recent survey conducted by Vallabhbhai Patel Chest Institute Delhi, more than an 11% of Delhiites are suffering from asthma and rhinitis. As per the survey, 11.69% were found to be suffering from rhinitis and 11.03% from asthma.
[25] A group of genes whose activity is coordinated by a DNA site is -
A.
operon
B.
cistron
C.
polysome
D.
polypeptide
Ans:
operon
Explanation :
The operon is defined as a group of genes whose activity is coordinated by a DNA site. An operon i s a functioning unit of genomic DNA containing a cluster of genes under the control of a single promoter. The genes are transcribed together into an mRNA strand and either translated together in the cytoplasm, or undergo trans-splicing to create monocistronic mR-NAs that are translated separately.
Explanation :
Fertilization in plants is not directly influenced by sunlight. It occurs when pollen grains are transported from anthers to stigma. When ripe pollen from an anther catches on the stigma of the same kind of flower, each pollen grain sends out a small thread-like tube. Fertilization occurs after pollination, when pollen grains land on the stigma of a flower of the same species. During this time, a series of events take place leading to the formation of seeds.
[22] Which mosquito is the carrier of Zika virus?
A.
Culex
B.
Aedes
C.
Anopheles
D.
Culiseta
Ans:
Aedes
Explanation :
Zika virus (ZIKV) is a member of the virus family Flaviviridae is spread by daytime-active Aedes mosquitoes, such as A. aegypti and A. albopictus. Its name comes from the Zika Forest of Uganda, where the virus was first isolated in 1947. Zika virus is related to the dengue, yellow fever, Japanese encephalitis, and West Nile viruses.
[23] Root cap is derived from -
A.
Derm atogen
B.
Calyptrogen
C.
Protoderm
D.
Histogen
Ans:
Calyptrogen
Explanation :
Calyptrogen is a layer of rapidly dividing cells at the tip of a plant root, from which the root cap is formed. It occurs in grasses and many other plants. The root cap is formed by several layers of cells that envelop the root tip externally. This covering of cells, of which the outermost ones are dead, envelops and protects the growing tip very much as a thimble protects the finger.
[24] percent of Delhites are suffering from Asthma and Rhinitis.
A.
0.13
B.
0.1
C.
0.11
D.
0.12
Ans:
0.11
Explanation :
As per a recent survey conducted by Vallabhbhai Patel Chest Institute Delhi, more than an 11% of Delhiites are suffering from asthma and rhinitis. As per the survey, 11.69% were found to be suffering from rhinitis and 11.03% from asthma.
[25] A group of genes whose activity is coordinated by a DNA site is -
A.
operon
B.
cistron
C.
polysome
D.
polypeptide
Ans:
operon
Explanation :
The operon is defined as a group of genes whose activity is coordinated by a DNA site. An operon i s a functioning unit of genomic DNA containing a cluster of genes under the control of a single promoter. The genes are transcribed together into an mRNA strand and either translated together in the cytoplasm, or undergo trans-splicing to create monocistronic mR-NAs that are translated separately.
Explanation :
Calyptrogen is a layer of rapidly dividing cells at the tip of a plant root, from which the root cap is formed. It occurs in grasses and many other plants. The root cap is formed by several layers of cells that envelop the root tip externally. This covering of cells, of which the outermost ones are dead, envelops and protects the growing tip very much as a thimble protects the finger.
[24] percent of Delhites are suffering from Asthma and Rhinitis.
A.
0.13
B.
0.1
C.
0.11
D.
0.12
Ans:
0.11
Explanation :
As per a recent survey conducted by Vallabhbhai Patel Chest Institute Delhi, more than an 11% of Delhiites are suffering from asthma and rhinitis. As per the survey, 11.69% were found to be suffering from rhinitis and 11.03% from asthma.
[25] A group of genes whose activity is coordinated by a DNA site is -
A.
operon
B.
cistron
C.
polysome
D.
polypeptide
Ans:
operon
Explanation :
The operon is defined as a group of genes whose activity is coordinated by a DNA site. An operon i s a functioning unit of genomic DNA containing a cluster of genes under the control of a single promoter. The genes are transcribed together into an mRNA strand and either translated together in the cytoplasm, or undergo trans-splicing to create monocistronic mR-NAs that are translated separately.
Explanation :
The operon is defined as a group of genes whose activity is coordinated by a DNA site. An operon i s a functioning unit of genomic DNA containing a cluster of genes under the control of a single promoter. The genes are transcribed together into an mRNA strand and either translated together in the cytoplasm, or undergo trans-splicing to create monocistronic mR-NAs that are translated separately.