[1] The most suitable soil for the production of cotton is -
A.
Black lava soil
B.
Alluvial soil
C.
Loamy soil
D.
Well drained soil
Ans:
Black lava soil
Explanation :
Black soil is most suitable for the cultivation of cotton. The deep and medium black lava soil of the Deccan and Malwa plateaus is considered ideal, though it can be grown on alluvial 'and red soil as well. The black cotton soil is also known as regur.
[2] Chromosome designation of Turner syndrome is:
A.
44A+XO
B.
44A+XXX
C.
44A+XXY
D.
44A+XYY
Ans:
44A+XO
Explanation :
Turner syndrome is a rare chromosomal disorder characterized by partial or complete loss (monosomy) of one of the X chromosomes that affects females. Individuals with Turner syndrome have only 45 chromosomes, including just a single X chromosome. This monosomic has a chromosome complement of 44 autosomes and one X chromosome (44+XO). The abnormal condition probably originates from exceptional egg or sperm with no X chromosome.
[3] Rusting is the process of -
A.
Oxidation
B.
Reduction
C.
Decomposition
D.
Displacement
Ans:
Oxidation
Explanation :
Rusting is the common term for corrosion of iron and its alloys, such as steel. Many other metals undergo similar corrosion, but the resulting oxides are not commonly called rust.
[4] Enzymes are -
A.
Steroids
B.
Carbohydrates
C.
Proteins
D.
Lipids
Ans:
Carbohydrates
Explanation :
Enzymes are proteins that speed up chemical reactions in the cell. They are highly selective catalysts, greatly accelerating both the rate and specificity of metabolic reactions. Most enzymes are proteins, although some catalytic RNA molecules have been identified.
[5] The plant that behaves as a root parasite is -
A.
Ficus
B.
Santalum
C.
Cuscuta
D.
Euphorbia
Ans:
Cuscuta
Explanation :
Plants which either obtain readymade organic food prepared by other plants or absorb water and minerals from other plants to prepare their own organic food are called parasitic plants. Cuscuta (Doddar) is a total stem parasite.
[6] Which of the following is the basic characteristic of a living organism?
A.
Ability to breathe
B.
Ability to reproduce
C.
Ability to move
D.
Ability to eat
Ans:
Ability to breathe
Explanation :
Living beings are systems or organisms that tend to respond to changes in their environment and inside themselves, in such a way as to promote their own continuation and longevity. They have the ability to breathe or respire move or navigate and the ability to multiply. Living organisms include human beings, plants, insects, animals among others.
[7] Myopia is a disease connected with -
A.
Lungs
B.
Brain
C.
Ears
D.
Eyes
Ans:
Eyes
Explanation :
Myopia, commonly known as nearsightedness, is a vision condition in which close objects are seen clearly, but objects' farther away appear blurred. It occurs if the eyeball is too long or the cornea, the clear front cover of the eye has too much curvature. Concave lenses or corrective surgery is used to correct this defect.
[8] Dumb-bell shaped guard cells are present in -
A.
Groundnut
B.
Gram
C.
Wheat
D.
Mango
Ans:
Wheat
Explanation :
Guard cells are dumb-bell shaped in monocots such as wheat. The central portion of the guard cells in wheat is narrow and two ends are bulbous. Guard cells are surrounded by adjacent subsidiary cells.
[9] Which lobe of human brain is associated with hearing -
A.
Frontal lobe
B.
Parietal lobe
C.
Temporal lobe
D.
Occipital lobe
Ans:
Temporal lobe
Explanation :
The Temporal Lobes, located on each side of the head above the ears, control hearing and are related to smell, taste and short-term memory.
[10] If the stomach did not produce any hydrochloric acid, which enzyme will not function?
A.
Ptyalin
B.
Rennin
C.
Pepsin
D.
Lipase
Ans:
Pepsin
Explanation :
Hydrochloric acid converts pepsinogen into an enzyme called pepsin. When food enters the stomach, hydrochloric acid production increases and the pH may fall to as low as 1 or 2, a very acidic condition.
[11] The environment includes -
A.
Abiotic factors
B.
Biotic factors
C.
Oxygen and Nitrogen
D.
Abiotic and Biotic factors
Ans:
Abiotic and Biotic factors
Explanation :
An environment encompasses all living (biotic) and non-living things (abiotic) occurring naturally on Earth. It consists of plants, animals and micro-organisms (biotic factors) in an area functioning together with all of the non-living physical (abiotic) factors.
[12] Rhizobium is a kind of -
A.
Photosynthetic bacteria
B.
Symbiotic bacteria
C.
Parasitic bacteria
D.
Saprophytic bacteria
Ans:
Symbiotic bacteria
Explanation :
Rhizobia are soil bacteria that fix nitrogen after becoming established inside root nodules of legumes. They are the only nitrogen-fixing bacteria living in a symbiotic relationship with legumes. Common crop and forage legumes are peas, beans, clover, and soy.
[13] Which one of the following is an insectivorous plant?
A.
Utricularia
B.
Sequoia Gigantia
C.
Nostoc
D.
Bryophyta
Ans:
Utricularia
Explanation :
Insectivorous plants are green plants but insectivorous habit develops due to deficiency of nitrogen in the soil. They usually grow in swampy areas. For example, Nepenthes or pitcher plant, Utricularia or bladderwort, which is a hydrophyte insectivorous plant and also a pollution indicator.
[14] Polyploidy arises due to change in the -
A.
number of chromatids
B.
structure of genes
C.
number of chromosomes
D.
structure of chromosomes
Ans:
number of chromosomes
Explanation :
An organism having more than two sets of homologous chromosomes is known as polyploid and the phenomenon polyploidy. Polyploidy refers to a numerical change in a whole set of chromosomes. Polyploidy may occur due to abnormal cell division, either during mitosis, or commonly during metaphase I in meiosis.
[15] The largest artery in human body is -
A.
Aorta
B.
Capillaiy
C.
Vena cava
D.
Pulmonary vein
Ans:
Aorta
Explanation :
The aorta is the largest artery of the human body. It is an artery that directly arises from the heart itself and descends through the thorax and into the abdomen. All the arteries of the body, save the pulmonary arteries, stem from the aorta or one of its main branches.
[16] The tree species most commonly used in social forestry is -
A.
Peepal
B.
Gulmohar
C.
Eucalyptus
D.
Mango
Ans:
Eucalyptus
Explanation :
Eucalyptus, Acacia, Polar, etc are some of the most commonly used tree species in social forestry. This is because Eucalyptus helps meet increasing wood demands from dwindling natural forests, supplying local communities and industry alike. Eucalyptus first became a component of India's social forestry program in the 1970s. With financial assistance from the World Bank, large tracts of forest lands, farms, and degraded land in the Indian states of Karnataka, Gujarat, Uttar Pradesh, Punjab and Haryana were planted with eucalyptus.
[17] The most productive ecosystem in the biosphere is -
A.
Desert
B.
Open Ocean
C.
Estuary
D.
Tundra
Ans:
Estuary
Explanation :
Ecotone regions (transitional zones) like mangroves, wetlands, estuaries, grasslands etc. have far greater productivity compared to natural ecosystems like forest ecosystem, ocean ecosystem, pond ecosystem, riverine ecosystem, desert ecosystem etc. This is because of the wide-ranging species from the adjacent ecosystems being present in the ecotone. Also, an estuary has very little wave action, so it provides a calm refuge from the open sea and hence becomes ideal for the survival of numerous aquatic species. Estuaries are most heavily populated areas throughout the world, with about 60% of the world’s population living along estuaries and the coast.
[18] Panthera Pardus is the scientific name of -
A.
Leopard
B.
Tiger
C.
Lion
D.
Panther
Ans:
Leopard
Explanation :
Panthera pardus is the scientific name of leopard, one of the five "big cats" in the genus Panthera.
[19] The plant cell will shrink when placed in -
A.
An isotonic solution
B.
Hypertonic solution
C.
Hypotonic solution
D.
Water
Ans:
Hypertonic solution
Explanation :
If a plant cell is placed in a hypertonic solution, the plant cell loses water and hence turgor pressure by plasmolysis: pressure decreases to the point where the protoplasm of the cell peels away from the cell wall, leaving gaps between the cell wall and the membrane and making the plant cell shrink and crumple.
[20] Bacterial decomposition of biological material under anaerobic condition is -
A.
fermentation
B.
fertilization
C.
contamination
D.
composting
Ans:
fermentation
Explanation :
Fermentation is the process by which complex organic compounds, such as glucose, are broken down by the action of enzymes into simpler compounds in the absence of oxygen (anaerobic). Yeasts can convert sugars to alcohol and carbon dioxide by fermentation. Fermentation is used to produce wine, beer, yogurt and other products.
[21] The only living tissue in plant xylem is -
A.
Trachea
B.
Xylem fibre
C.
Xylem parenchyma
D.
Tracheid
Ans:
Xylem parenchyma
Explanation :
Xylem parenchyma is the only living component found in xylem tissue. They are living cells associated with the xylem that are found in between the vessels arid the fibers. They act as storage house of starch and fat with assisting in conduction of water. Xylem is a complex permanent tissue specialized for the conduction of water and mineral substances in plants.
[22] 'Insectivorous plants' trap insects for -
A.
Nitrogen
B.
Fats
C.
Vitamins
D.
Carbohydrates
Ans:
Nitrogen
Explanation :
Insectivorous plants trap insects because they grow in a soil which is deficient in nitrogen (such as acidic bogs and rock outcrops). The insects they feed on help them in fulfilling their nitrogen needs. Venus flytrap, pitcher plant, utricularia, drosera and Rafflesia are the examples of insectivorous plants.
[23] Blood Circulation was discovered by -
A.
Mary Anderson
B.
Virginia Apgar
C.
William Harvey
D.
Robert Feulgen
Ans:
William Harvey
Explanation :
Harvey also continued his study into the vascular system and in 1616 he announced his discovery of the circulation of blood within the body.
[24] Aerenchyma is present in -
A.
Banana stem
B.
Palm stem
C.
Aquatic plants
D.
Xerophytic plants
Ans:
Aquatic plants
Explanation :
A xerophyte is a species of plant that has adaptations to survive in an environment with little liquid water, such as a desert or an ice or snow-covered region in the Alps or the Arctic.
[25] Which of the following is responsible for transport of food and other substances in plants?
A.
Xylem
B.
Phloem
C.
Chloroplast
D.
None of these
Ans:
Phloem
Explanation :
The transport of water, nutrients and other substances from one part of a plant to another is called translocation. While, phloem transports synthesized food from the leaves to the rest of the plant body; water and minerals are transported from the roots upwards through the xylem tubes.
Explanation :
Black soil is most suitable for the cultivation of cotton. The deep and medium black lava soil of the Deccan and Malwa plateaus is considered ideal, though it can be grown on alluvial 'and red soil as well. The black cotton soil is also known as regur.
[2] Chromosome designation of Turner syndrome is:
A.
44A+XO
B.
44A+XXX
C.
44A+XXY
D.
44A+XYY
Ans:
44A+XO
Explanation :
Turner syndrome is a rare chromosomal disorder characterized by partial or complete loss (monosomy) of one of the X chromosomes that affects females. Individuals with Turner syndrome have only 45 chromosomes, including just a single X chromosome. This monosomic has a chromosome complement of 44 autosomes and one X chromosome (44+XO). The abnormal condition probably originates from exceptional egg or sperm with no X chromosome.
[3] Rusting is the process of -
A.
Oxidation
B.
Reduction
C.
Decomposition
D.
Displacement
Ans:
Oxidation
Explanation :
Rusting is the common term for corrosion of iron and its alloys, such as steel. Many other metals undergo similar corrosion, but the resulting oxides are not commonly called rust.
[4] Enzymes are -
A.
Steroids
B.
Carbohydrates
C.
Proteins
D.
Lipids
Ans:
Carbohydrates
Explanation :
Enzymes are proteins that speed up chemical reactions in the cell. They are highly selective catalysts, greatly accelerating both the rate and specificity of metabolic reactions. Most enzymes are proteins, although some catalytic RNA molecules have been identified.
[5] The plant that behaves as a root parasite is -
A.
Ficus
B.
Santalum
C.
Cuscuta
D.
Euphorbia
Ans:
Cuscuta
Explanation :
Plants which either obtain readymade organic food prepared by other plants or absorb water and minerals from other plants to prepare their own organic food are called parasitic plants. Cuscuta (Doddar) is a total stem parasite.
[6] Which of the following is the basic characteristic of a living organism?
A.
Ability to breathe
B.
Ability to reproduce
C.
Ability to move
D.
Ability to eat
Ans:
Ability to breathe
Explanation :
Living beings are systems or organisms that tend to respond to changes in their environment and inside themselves, in such a way as to promote their own continuation and longevity. They have the ability to breathe or respire move or navigate and the ability to multiply. Living organisms include human beings, plants, insects, animals among others.
[7] Myopia is a disease connected with -
A.
Lungs
B.
Brain
C.
Ears
D.
Eyes
Ans:
Eyes
Explanation :
Myopia, commonly known as nearsightedness, is a vision condition in which close objects are seen clearly, but objects' farther away appear blurred. It occurs if the eyeball is too long or the cornea, the clear front cover of the eye has too much curvature. Concave lenses or corrective surgery is used to correct this defect.
[8] Dumb-bell shaped guard cells are present in -
A.
Groundnut
B.
Gram
C.
Wheat
D.
Mango
Ans:
Wheat
Explanation :
Guard cells are dumb-bell shaped in monocots such as wheat. The central portion of the guard cells in wheat is narrow and two ends are bulbous. Guard cells are surrounded by adjacent subsidiary cells.
[9] Which lobe of human brain is associated with hearing -
A.
Frontal lobe
B.
Parietal lobe
C.
Temporal lobe
D.
Occipital lobe
Ans:
Temporal lobe
Explanation :
The Temporal Lobes, located on each side of the head above the ears, control hearing and are related to smell, taste and short-term memory.
[10] If the stomach did not produce any hydrochloric acid, which enzyme will not function?
A.
Ptyalin
B.
Rennin
C.
Pepsin
D.
Lipase
Ans:
Pepsin
Explanation :
Hydrochloric acid converts pepsinogen into an enzyme called pepsin. When food enters the stomach, hydrochloric acid production increases and the pH may fall to as low as 1 or 2, a very acidic condition.
[11] The environment includes -
A.
Abiotic factors
B.
Biotic factors
C.
Oxygen and Nitrogen
D.
Abiotic and Biotic factors
Ans:
Abiotic and Biotic factors
Explanation :
An environment encompasses all living (biotic) and non-living things (abiotic) occurring naturally on Earth. It consists of plants, animals and micro-organisms (biotic factors) in an area functioning together with all of the non-living physical (abiotic) factors.
[12] Rhizobium is a kind of -
A.
Photosynthetic bacteria
B.
Symbiotic bacteria
C.
Parasitic bacteria
D.
Saprophytic bacteria
Ans:
Symbiotic bacteria
Explanation :
Rhizobia are soil bacteria that fix nitrogen after becoming established inside root nodules of legumes. They are the only nitrogen-fixing bacteria living in a symbiotic relationship with legumes. Common crop and forage legumes are peas, beans, clover, and soy.
[13] Which one of the following is an insectivorous plant?
A.
Utricularia
B.
Sequoia Gigantia
C.
Nostoc
D.
Bryophyta
Ans:
Utricularia
Explanation :
Insectivorous plants are green plants but insectivorous habit develops due to deficiency of nitrogen in the soil. They usually grow in swampy areas. For example, Nepenthes or pitcher plant, Utricularia or bladderwort, which is a hydrophyte insectivorous plant and also a pollution indicator.
[14] Polyploidy arises due to change in the -
A.
number of chromatids
B.
structure of genes
C.
number of chromosomes
D.
structure of chromosomes
Ans:
number of chromosomes
Explanation :
An organism having more than two sets of homologous chromosomes is known as polyploid and the phenomenon polyploidy. Polyploidy refers to a numerical change in a whole set of chromosomes. Polyploidy may occur due to abnormal cell division, either during mitosis, or commonly during metaphase I in meiosis.
[15] The largest artery in human body is -
A.
Aorta
B.
Capillaiy
C.
Vena cava
D.
Pulmonary vein
Ans:
Aorta
Explanation :
The aorta is the largest artery of the human body. It is an artery that directly arises from the heart itself and descends through the thorax and into the abdomen. All the arteries of the body, save the pulmonary arteries, stem from the aorta or one of its main branches.
[16] The tree species most commonly used in social forestry is -
A.
Peepal
B.
Gulmohar
C.
Eucalyptus
D.
Mango
Ans:
Eucalyptus
Explanation :
Eucalyptus, Acacia, Polar, etc are some of the most commonly used tree species in social forestry. This is because Eucalyptus helps meet increasing wood demands from dwindling natural forests, supplying local communities and industry alike. Eucalyptus first became a component of India's social forestry program in the 1970s. With financial assistance from the World Bank, large tracts of forest lands, farms, and degraded land in the Indian states of Karnataka, Gujarat, Uttar Pradesh, Punjab and Haryana were planted with eucalyptus.
[17] The most productive ecosystem in the biosphere is -
A.
Desert
B.
Open Ocean
C.
Estuary
D.
Tundra
Ans:
Estuary
Explanation :
Ecotone regions (transitional zones) like mangroves, wetlands, estuaries, grasslands etc. have far greater productivity compared to natural ecosystems like forest ecosystem, ocean ecosystem, pond ecosystem, riverine ecosystem, desert ecosystem etc. This is because of the wide-ranging species from the adjacent ecosystems being present in the ecotone. Also, an estuary has very little wave action, so it provides a calm refuge from the open sea and hence becomes ideal for the survival of numerous aquatic species. Estuaries are most heavily populated areas throughout the world, with about 60% of the world’s population living along estuaries and the coast.
[18] Panthera Pardus is the scientific name of -
A.
Leopard
B.
Tiger
C.
Lion
D.
Panther
Ans:
Leopard
Explanation :
Panthera pardus is the scientific name of leopard, one of the five "big cats" in the genus Panthera.
[19] The plant cell will shrink when placed in -
A.
An isotonic solution
B.
Hypertonic solution
C.
Hypotonic solution
D.
Water
Ans:
Hypertonic solution
Explanation :
If a plant cell is placed in a hypertonic solution, the plant cell loses water and hence turgor pressure by plasmolysis: pressure decreases to the point where the protoplasm of the cell peels away from the cell wall, leaving gaps between the cell wall and the membrane and making the plant cell shrink and crumple.
[20] Bacterial decomposition of biological material under anaerobic condition is -
A.
fermentation
B.
fertilization
C.
contamination
D.
composting
Ans:
fermentation
Explanation :
Fermentation is the process by which complex organic compounds, such as glucose, are broken down by the action of enzymes into simpler compounds in the absence of oxygen (anaerobic). Yeasts can convert sugars to alcohol and carbon dioxide by fermentation. Fermentation is used to produce wine, beer, yogurt and other products.
[21] The only living tissue in plant xylem is -
A.
Trachea
B.
Xylem fibre
C.
Xylem parenchyma
D.
Tracheid
Ans:
Xylem parenchyma
Explanation :
Xylem parenchyma is the only living component found in xylem tissue. They are living cells associated with the xylem that are found in between the vessels arid the fibers. They act as storage house of starch and fat with assisting in conduction of water. Xylem is a complex permanent tissue specialized for the conduction of water and mineral substances in plants.
[22] 'Insectivorous plants' trap insects for -
A.
Nitrogen
B.
Fats
C.
Vitamins
D.
Carbohydrates
Ans:
Nitrogen
Explanation :
Insectivorous plants trap insects because they grow in a soil which is deficient in nitrogen (such as acidic bogs and rock outcrops). The insects they feed on help them in fulfilling their nitrogen needs. Venus flytrap, pitcher plant, utricularia, drosera and Rafflesia are the examples of insectivorous plants.
[23] Blood Circulation was discovered by -
A.
Mary Anderson
B.
Virginia Apgar
C.
William Harvey
D.
Robert Feulgen
Ans:
William Harvey
Explanation :
Harvey also continued his study into the vascular system and in 1616 he announced his discovery of the circulation of blood within the body.
[24] Aerenchyma is present in -
A.
Banana stem
B.
Palm stem
C.
Aquatic plants
D.
Xerophytic plants
Ans:
Aquatic plants
Explanation :
A xerophyte is a species of plant that has adaptations to survive in an environment with little liquid water, such as a desert or an ice or snow-covered region in the Alps or the Arctic.
[25] Which of the following is responsible for transport of food and other substances in plants?
A.
Xylem
B.
Phloem
C.
Chloroplast
D.
None of these
Ans:
Phloem
Explanation :
The transport of water, nutrients and other substances from one part of a plant to another is called translocation. While, phloem transports synthesized food from the leaves to the rest of the plant body; water and minerals are transported from the roots upwards through the xylem tubes.
Explanation :
Rusting is the common term for corrosion of iron and its alloys, such as steel. Many other metals undergo similar corrosion, but the resulting oxides are not commonly called rust.
[4] Enzymes are -
A.
Steroids
B.
Carbohydrates
C.
Proteins
D.
Lipids
Ans:
Carbohydrates
Explanation :
Enzymes are proteins that speed up chemical reactions in the cell. They are highly selective catalysts, greatly accelerating both the rate and specificity of metabolic reactions. Most enzymes are proteins, although some catalytic RNA molecules have been identified.
[5] The plant that behaves as a root parasite is -
A.
Ficus
B.
Santalum
C.
Cuscuta
D.
Euphorbia
Ans:
Cuscuta
Explanation :
Plants which either obtain readymade organic food prepared by other plants or absorb water and minerals from other plants to prepare their own organic food are called parasitic plants. Cuscuta (Doddar) is a total stem parasite.
[6] Which of the following is the basic characteristic of a living organism?
A.
Ability to breathe
B.
Ability to reproduce
C.
Ability to move
D.
Ability to eat
Ans:
Ability to breathe
Explanation :
Living beings are systems or organisms that tend to respond to changes in their environment and inside themselves, in such a way as to promote their own continuation and longevity. They have the ability to breathe or respire move or navigate and the ability to multiply. Living organisms include human beings, plants, insects, animals among others.
[7] Myopia is a disease connected with -
A.
Lungs
B.
Brain
C.
Ears
D.
Eyes
Ans:
Eyes
Explanation :
Myopia, commonly known as nearsightedness, is a vision condition in which close objects are seen clearly, but objects' farther away appear blurred. It occurs if the eyeball is too long or the cornea, the clear front cover of the eye has too much curvature. Concave lenses or corrective surgery is used to correct this defect.
[8] Dumb-bell shaped guard cells are present in -
A.
Groundnut
B.
Gram
C.
Wheat
D.
Mango
Ans:
Wheat
Explanation :
Guard cells are dumb-bell shaped in monocots such as wheat. The central portion of the guard cells in wheat is narrow and two ends are bulbous. Guard cells are surrounded by adjacent subsidiary cells.
[9] Which lobe of human brain is associated with hearing -
A.
Frontal lobe
B.
Parietal lobe
C.
Temporal lobe
D.
Occipital lobe
Ans:
Temporal lobe
Explanation :
The Temporal Lobes, located on each side of the head above the ears, control hearing and are related to smell, taste and short-term memory.
[10] If the stomach did not produce any hydrochloric acid, which enzyme will not function?
A.
Ptyalin
B.
Rennin
C.
Pepsin
D.
Lipase
Ans:
Pepsin
Explanation :
Hydrochloric acid converts pepsinogen into an enzyme called pepsin. When food enters the stomach, hydrochloric acid production increases and the pH may fall to as low as 1 or 2, a very acidic condition.
[11] The environment includes -
A.
Abiotic factors
B.
Biotic factors
C.
Oxygen and Nitrogen
D.
Abiotic and Biotic factors
Ans:
Abiotic and Biotic factors
Explanation :
An environment encompasses all living (biotic) and non-living things (abiotic) occurring naturally on Earth. It consists of plants, animals and micro-organisms (biotic factors) in an area functioning together with all of the non-living physical (abiotic) factors.
[12] Rhizobium is a kind of -
A.
Photosynthetic bacteria
B.
Symbiotic bacteria
C.
Parasitic bacteria
D.
Saprophytic bacteria
Ans:
Symbiotic bacteria
Explanation :
Rhizobia are soil bacteria that fix nitrogen after becoming established inside root nodules of legumes. They are the only nitrogen-fixing bacteria living in a symbiotic relationship with legumes. Common crop and forage legumes are peas, beans, clover, and soy.
[13] Which one of the following is an insectivorous plant?
A.
Utricularia
B.
Sequoia Gigantia
C.
Nostoc
D.
Bryophyta
Ans:
Utricularia
Explanation :
Insectivorous plants are green plants but insectivorous habit develops due to deficiency of nitrogen in the soil. They usually grow in swampy areas. For example, Nepenthes or pitcher plant, Utricularia or bladderwort, which is a hydrophyte insectivorous plant and also a pollution indicator.
[14] Polyploidy arises due to change in the -
A.
number of chromatids
B.
structure of genes
C.
number of chromosomes
D.
structure of chromosomes
Ans:
number of chromosomes
Explanation :
An organism having more than two sets of homologous chromosomes is known as polyploid and the phenomenon polyploidy. Polyploidy refers to a numerical change in a whole set of chromosomes. Polyploidy may occur due to abnormal cell division, either during mitosis, or commonly during metaphase I in meiosis.
[15] The largest artery in human body is -
A.
Aorta
B.
Capillaiy
C.
Vena cava
D.
Pulmonary vein
Ans:
Aorta
Explanation :
The aorta is the largest artery of the human body. It is an artery that directly arises from the heart itself and descends through the thorax and into the abdomen. All the arteries of the body, save the pulmonary arteries, stem from the aorta or one of its main branches.
[16] The tree species most commonly used in social forestry is -
A.
Peepal
B.
Gulmohar
C.
Eucalyptus
D.
Mango
Ans:
Eucalyptus
Explanation :
Eucalyptus, Acacia, Polar, etc are some of the most commonly used tree species in social forestry. This is because Eucalyptus helps meet increasing wood demands from dwindling natural forests, supplying local communities and industry alike. Eucalyptus first became a component of India's social forestry program in the 1970s. With financial assistance from the World Bank, large tracts of forest lands, farms, and degraded land in the Indian states of Karnataka, Gujarat, Uttar Pradesh, Punjab and Haryana were planted with eucalyptus.
[17] The most productive ecosystem in the biosphere is -
A.
Desert
B.
Open Ocean
C.
Estuary
D.
Tundra
Ans:
Estuary
Explanation :
Ecotone regions (transitional zones) like mangroves, wetlands, estuaries, grasslands etc. have far greater productivity compared to natural ecosystems like forest ecosystem, ocean ecosystem, pond ecosystem, riverine ecosystem, desert ecosystem etc. This is because of the wide-ranging species from the adjacent ecosystems being present in the ecotone. Also, an estuary has very little wave action, so it provides a calm refuge from the open sea and hence becomes ideal for the survival of numerous aquatic species. Estuaries are most heavily populated areas throughout the world, with about 60% of the world’s population living along estuaries and the coast.
[18] Panthera Pardus is the scientific name of -
A.
Leopard
B.
Tiger
C.
Lion
D.
Panther
Ans:
Leopard
Explanation :
Panthera pardus is the scientific name of leopard, one of the five "big cats" in the genus Panthera.
[19] The plant cell will shrink when placed in -
A.
An isotonic solution
B.
Hypertonic solution
C.
Hypotonic solution
D.
Water
Ans:
Hypertonic solution
Explanation :
If a plant cell is placed in a hypertonic solution, the plant cell loses water and hence turgor pressure by plasmolysis: pressure decreases to the point where the protoplasm of the cell peels away from the cell wall, leaving gaps between the cell wall and the membrane and making the plant cell shrink and crumple.
[20] Bacterial decomposition of biological material under anaerobic condition is -
A.
fermentation
B.
fertilization
C.
contamination
D.
composting
Ans:
fermentation
Explanation :
Fermentation is the process by which complex organic compounds, such as glucose, are broken down by the action of enzymes into simpler compounds in the absence of oxygen (anaerobic). Yeasts can convert sugars to alcohol and carbon dioxide by fermentation. Fermentation is used to produce wine, beer, yogurt and other products.
[21] The only living tissue in plant xylem is -
A.
Trachea
B.
Xylem fibre
C.
Xylem parenchyma
D.
Tracheid
Ans:
Xylem parenchyma
Explanation :
Xylem parenchyma is the only living component found in xylem tissue. They are living cells associated with the xylem that are found in between the vessels arid the fibers. They act as storage house of starch and fat with assisting in conduction of water. Xylem is a complex permanent tissue specialized for the conduction of water and mineral substances in plants.
[22] 'Insectivorous plants' trap insects for -
A.
Nitrogen
B.
Fats
C.
Vitamins
D.
Carbohydrates
Ans:
Nitrogen
Explanation :
Insectivorous plants trap insects because they grow in a soil which is deficient in nitrogen (such as acidic bogs and rock outcrops). The insects they feed on help them in fulfilling their nitrogen needs. Venus flytrap, pitcher plant, utricularia, drosera and Rafflesia are the examples of insectivorous plants.
[23] Blood Circulation was discovered by -
A.
Mary Anderson
B.
Virginia Apgar
C.
William Harvey
D.
Robert Feulgen
Ans:
William Harvey
Explanation :
Harvey also continued his study into the vascular system and in 1616 he announced his discovery of the circulation of blood within the body.
[24] Aerenchyma is present in -
A.
Banana stem
B.
Palm stem
C.
Aquatic plants
D.
Xerophytic plants
Ans:
Aquatic plants
Explanation :
A xerophyte is a species of plant that has adaptations to survive in an environment with little liquid water, such as a desert or an ice or snow-covered region in the Alps or the Arctic.
[25] Which of the following is responsible for transport of food and other substances in plants?
A.
Xylem
B.
Phloem
C.
Chloroplast
D.
None of these
Ans:
Phloem
Explanation :
The transport of water, nutrients and other substances from one part of a plant to another is called translocation. While, phloem transports synthesized food from the leaves to the rest of the plant body; water and minerals are transported from the roots upwards through the xylem tubes.
Explanation :
Plants which either obtain readymade organic food prepared by other plants or absorb water and minerals from other plants to prepare their own organic food are called parasitic plants. Cuscuta (Doddar) is a total stem parasite.
[6] Which of the following is the basic characteristic of a living organism?
A.
Ability to breathe
B.
Ability to reproduce
C.
Ability to move
D.
Ability to eat
Ans:
Ability to breathe
Explanation :
Living beings are systems or organisms that tend to respond to changes in their environment and inside themselves, in such a way as to promote their own continuation and longevity. They have the ability to breathe or respire move or navigate and the ability to multiply. Living organisms include human beings, plants, insects, animals among others.
[7] Myopia is a disease connected with -
A.
Lungs
B.
Brain
C.
Ears
D.
Eyes
Ans:
Eyes
Explanation :
Myopia, commonly known as nearsightedness, is a vision condition in which close objects are seen clearly, but objects' farther away appear blurred. It occurs if the eyeball is too long or the cornea, the clear front cover of the eye has too much curvature. Concave lenses or corrective surgery is used to correct this defect.
[8] Dumb-bell shaped guard cells are present in -
A.
Groundnut
B.
Gram
C.
Wheat
D.
Mango
Ans:
Wheat
Explanation :
Guard cells are dumb-bell shaped in monocots such as wheat. The central portion of the guard cells in wheat is narrow and two ends are bulbous. Guard cells are surrounded by adjacent subsidiary cells.
[9] Which lobe of human brain is associated with hearing -
A.
Frontal lobe
B.
Parietal lobe
C.
Temporal lobe
D.
Occipital lobe
Ans:
Temporal lobe
Explanation :
The Temporal Lobes, located on each side of the head above the ears, control hearing and are related to smell, taste and short-term memory.
[10] If the stomach did not produce any hydrochloric acid, which enzyme will not function?
A.
Ptyalin
B.
Rennin
C.
Pepsin
D.
Lipase
Ans:
Pepsin
Explanation :
Hydrochloric acid converts pepsinogen into an enzyme called pepsin. When food enters the stomach, hydrochloric acid production increases and the pH may fall to as low as 1 or 2, a very acidic condition.
[11] The environment includes -
A.
Abiotic factors
B.
Biotic factors
C.
Oxygen and Nitrogen
D.
Abiotic and Biotic factors
Ans:
Abiotic and Biotic factors
Explanation :
An environment encompasses all living (biotic) and non-living things (abiotic) occurring naturally on Earth. It consists of plants, animals and micro-organisms (biotic factors) in an area functioning together with all of the non-living physical (abiotic) factors.
[12] Rhizobium is a kind of -
A.
Photosynthetic bacteria
B.
Symbiotic bacteria
C.
Parasitic bacteria
D.
Saprophytic bacteria
Ans:
Symbiotic bacteria
Explanation :
Rhizobia are soil bacteria that fix nitrogen after becoming established inside root nodules of legumes. They are the only nitrogen-fixing bacteria living in a symbiotic relationship with legumes. Common crop and forage legumes are peas, beans, clover, and soy.
[13] Which one of the following is an insectivorous plant?
A.
Utricularia
B.
Sequoia Gigantia
C.
Nostoc
D.
Bryophyta
Ans:
Utricularia
Explanation :
Insectivorous plants are green plants but insectivorous habit develops due to deficiency of nitrogen in the soil. They usually grow in swampy areas. For example, Nepenthes or pitcher plant, Utricularia or bladderwort, which is a hydrophyte insectivorous plant and also a pollution indicator.
[14] Polyploidy arises due to change in the -
A.
number of chromatids
B.
structure of genes
C.
number of chromosomes
D.
structure of chromosomes
Ans:
number of chromosomes
Explanation :
An organism having more than two sets of homologous chromosomes is known as polyploid and the phenomenon polyploidy. Polyploidy refers to a numerical change in a whole set of chromosomes. Polyploidy may occur due to abnormal cell division, either during mitosis, or commonly during metaphase I in meiosis.
[15] The largest artery in human body is -
A.
Aorta
B.
Capillaiy
C.
Vena cava
D.
Pulmonary vein
Ans:
Aorta
Explanation :
The aorta is the largest artery of the human body. It is an artery that directly arises from the heart itself and descends through the thorax and into the abdomen. All the arteries of the body, save the pulmonary arteries, stem from the aorta or one of its main branches.
[16] The tree species most commonly used in social forestry is -
A.
Peepal
B.
Gulmohar
C.
Eucalyptus
D.
Mango
Ans:
Eucalyptus
Explanation :
Eucalyptus, Acacia, Polar, etc are some of the most commonly used tree species in social forestry. This is because Eucalyptus helps meet increasing wood demands from dwindling natural forests, supplying local communities and industry alike. Eucalyptus first became a component of India's social forestry program in the 1970s. With financial assistance from the World Bank, large tracts of forest lands, farms, and degraded land in the Indian states of Karnataka, Gujarat, Uttar Pradesh, Punjab and Haryana were planted with eucalyptus.
[17] The most productive ecosystem in the biosphere is -
A.
Desert
B.
Open Ocean
C.
Estuary
D.
Tundra
Ans:
Estuary
Explanation :
Ecotone regions (transitional zones) like mangroves, wetlands, estuaries, grasslands etc. have far greater productivity compared to natural ecosystems like forest ecosystem, ocean ecosystem, pond ecosystem, riverine ecosystem, desert ecosystem etc. This is because of the wide-ranging species from the adjacent ecosystems being present in the ecotone. Also, an estuary has very little wave action, so it provides a calm refuge from the open sea and hence becomes ideal for the survival of numerous aquatic species. Estuaries are most heavily populated areas throughout the world, with about 60% of the world’s population living along estuaries and the coast.
[18] Panthera Pardus is the scientific name of -
A.
Leopard
B.
Tiger
C.
Lion
D.
Panther
Ans:
Leopard
Explanation :
Panthera pardus is the scientific name of leopard, one of the five "big cats" in the genus Panthera.
[19] The plant cell will shrink when placed in -
A.
An isotonic solution
B.
Hypertonic solution
C.
Hypotonic solution
D.
Water
Ans:
Hypertonic solution
Explanation :
If a plant cell is placed in a hypertonic solution, the plant cell loses water and hence turgor pressure by plasmolysis: pressure decreases to the point where the protoplasm of the cell peels away from the cell wall, leaving gaps between the cell wall and the membrane and making the plant cell shrink and crumple.
[20] Bacterial decomposition of biological material under anaerobic condition is -
A.
fermentation
B.
fertilization
C.
contamination
D.
composting
Ans:
fermentation
Explanation :
Fermentation is the process by which complex organic compounds, such as glucose, are broken down by the action of enzymes into simpler compounds in the absence of oxygen (anaerobic). Yeasts can convert sugars to alcohol and carbon dioxide by fermentation. Fermentation is used to produce wine, beer, yogurt and other products.
[21] The only living tissue in plant xylem is -
A.
Trachea
B.
Xylem fibre
C.
Xylem parenchyma
D.
Tracheid
Ans:
Xylem parenchyma
Explanation :
Xylem parenchyma is the only living component found in xylem tissue. They are living cells associated with the xylem that are found in between the vessels arid the fibers. They act as storage house of starch and fat with assisting in conduction of water. Xylem is a complex permanent tissue specialized for the conduction of water and mineral substances in plants.
[22] 'Insectivorous plants' trap insects for -
A.
Nitrogen
B.
Fats
C.
Vitamins
D.
Carbohydrates
Ans:
Nitrogen
Explanation :
Insectivorous plants trap insects because they grow in a soil which is deficient in nitrogen (such as acidic bogs and rock outcrops). The insects they feed on help them in fulfilling their nitrogen needs. Venus flytrap, pitcher plant, utricularia, drosera and Rafflesia are the examples of insectivorous plants.
[23] Blood Circulation was discovered by -
A.
Mary Anderson
B.
Virginia Apgar
C.
William Harvey
D.
Robert Feulgen
Ans:
William Harvey
Explanation :
Harvey also continued his study into the vascular system and in 1616 he announced his discovery of the circulation of blood within the body.
[24] Aerenchyma is present in -
A.
Banana stem
B.
Palm stem
C.
Aquatic plants
D.
Xerophytic plants
Ans:
Aquatic plants
Explanation :
A xerophyte is a species of plant that has adaptations to survive in an environment with little liquid water, such as a desert or an ice or snow-covered region in the Alps or the Arctic.
[25] Which of the following is responsible for transport of food and other substances in plants?
A.
Xylem
B.
Phloem
C.
Chloroplast
D.
None of these
Ans:
Phloem
Explanation :
The transport of water, nutrients and other substances from one part of a plant to another is called translocation. While, phloem transports synthesized food from the leaves to the rest of the plant body; water and minerals are transported from the roots upwards through the xylem tubes.
Explanation :
Myopia, commonly known as nearsightedness, is a vision condition in which close objects are seen clearly, but objects' farther away appear blurred. It occurs if the eyeball is too long or the cornea, the clear front cover of the eye has too much curvature. Concave lenses or corrective surgery is used to correct this defect.
[8] Dumb-bell shaped guard cells are present in -
A.
Groundnut
B.
Gram
C.
Wheat
D.
Mango
Ans:
Wheat
Explanation :
Guard cells are dumb-bell shaped in monocots such as wheat. The central portion of the guard cells in wheat is narrow and two ends are bulbous. Guard cells are surrounded by adjacent subsidiary cells.
[9] Which lobe of human brain is associated with hearing -
A.
Frontal lobe
B.
Parietal lobe
C.
Temporal lobe
D.
Occipital lobe
Ans:
Temporal lobe
Explanation :
The Temporal Lobes, located on each side of the head above the ears, control hearing and are related to smell, taste and short-term memory.
[10] If the stomach did not produce any hydrochloric acid, which enzyme will not function?
A.
Ptyalin
B.
Rennin
C.
Pepsin
D.
Lipase
Ans:
Pepsin
Explanation :
Hydrochloric acid converts pepsinogen into an enzyme called pepsin. When food enters the stomach, hydrochloric acid production increases and the pH may fall to as low as 1 or 2, a very acidic condition.
[11] The environment includes -
A.
Abiotic factors
B.
Biotic factors
C.
Oxygen and Nitrogen
D.
Abiotic and Biotic factors
Ans:
Abiotic and Biotic factors
Explanation :
An environment encompasses all living (biotic) and non-living things (abiotic) occurring naturally on Earth. It consists of plants, animals and micro-organisms (biotic factors) in an area functioning together with all of the non-living physical (abiotic) factors.
[12] Rhizobium is a kind of -
A.
Photosynthetic bacteria
B.
Symbiotic bacteria
C.
Parasitic bacteria
D.
Saprophytic bacteria
Ans:
Symbiotic bacteria
Explanation :
Rhizobia are soil bacteria that fix nitrogen after becoming established inside root nodules of legumes. They are the only nitrogen-fixing bacteria living in a symbiotic relationship with legumes. Common crop and forage legumes are peas, beans, clover, and soy.
[13] Which one of the following is an insectivorous plant?
A.
Utricularia
B.
Sequoia Gigantia
C.
Nostoc
D.
Bryophyta
Ans:
Utricularia
Explanation :
Insectivorous plants are green plants but insectivorous habit develops due to deficiency of nitrogen in the soil. They usually grow in swampy areas. For example, Nepenthes or pitcher plant, Utricularia or bladderwort, which is a hydrophyte insectivorous plant and also a pollution indicator.
[14] Polyploidy arises due to change in the -
A.
number of chromatids
B.
structure of genes
C.
number of chromosomes
D.
structure of chromosomes
Ans:
number of chromosomes
Explanation :
An organism having more than two sets of homologous chromosomes is known as polyploid and the phenomenon polyploidy. Polyploidy refers to a numerical change in a whole set of chromosomes. Polyploidy may occur due to abnormal cell division, either during mitosis, or commonly during metaphase I in meiosis.
[15] The largest artery in human body is -
A.
Aorta
B.
Capillaiy
C.
Vena cava
D.
Pulmonary vein
Ans:
Aorta
Explanation :
The aorta is the largest artery of the human body. It is an artery that directly arises from the heart itself and descends through the thorax and into the abdomen. All the arteries of the body, save the pulmonary arteries, stem from the aorta or one of its main branches.
[16] The tree species most commonly used in social forestry is -
A.
Peepal
B.
Gulmohar
C.
Eucalyptus
D.
Mango
Ans:
Eucalyptus
Explanation :
Eucalyptus, Acacia, Polar, etc are some of the most commonly used tree species in social forestry. This is because Eucalyptus helps meet increasing wood demands from dwindling natural forests, supplying local communities and industry alike. Eucalyptus first became a component of India's social forestry program in the 1970s. With financial assistance from the World Bank, large tracts of forest lands, farms, and degraded land in the Indian states of Karnataka, Gujarat, Uttar Pradesh, Punjab and Haryana were planted with eucalyptus.
[17] The most productive ecosystem in the biosphere is -
A.
Desert
B.
Open Ocean
C.
Estuary
D.
Tundra
Ans:
Estuary
Explanation :
Ecotone regions (transitional zones) like mangroves, wetlands, estuaries, grasslands etc. have far greater productivity compared to natural ecosystems like forest ecosystem, ocean ecosystem, pond ecosystem, riverine ecosystem, desert ecosystem etc. This is because of the wide-ranging species from the adjacent ecosystems being present in the ecotone. Also, an estuary has very little wave action, so it provides a calm refuge from the open sea and hence becomes ideal for the survival of numerous aquatic species. Estuaries are most heavily populated areas throughout the world, with about 60% of the world’s population living along estuaries and the coast.
[18] Panthera Pardus is the scientific name of -
A.
Leopard
B.
Tiger
C.
Lion
D.
Panther
Ans:
Leopard
Explanation :
Panthera pardus is the scientific name of leopard, one of the five "big cats" in the genus Panthera.
[19] The plant cell will shrink when placed in -
A.
An isotonic solution
B.
Hypertonic solution
C.
Hypotonic solution
D.
Water
Ans:
Hypertonic solution
Explanation :
If a plant cell is placed in a hypertonic solution, the plant cell loses water and hence turgor pressure by plasmolysis: pressure decreases to the point where the protoplasm of the cell peels away from the cell wall, leaving gaps between the cell wall and the membrane and making the plant cell shrink and crumple.
[20] Bacterial decomposition of biological material under anaerobic condition is -
A.
fermentation
B.
fertilization
C.
contamination
D.
composting
Ans:
fermentation
Explanation :
Fermentation is the process by which complex organic compounds, such as glucose, are broken down by the action of enzymes into simpler compounds in the absence of oxygen (anaerobic). Yeasts can convert sugars to alcohol and carbon dioxide by fermentation. Fermentation is used to produce wine, beer, yogurt and other products.
[21] The only living tissue in plant xylem is -
A.
Trachea
B.
Xylem fibre
C.
Xylem parenchyma
D.
Tracheid
Ans:
Xylem parenchyma
Explanation :
Xylem parenchyma is the only living component found in xylem tissue. They are living cells associated with the xylem that are found in between the vessels arid the fibers. They act as storage house of starch and fat with assisting in conduction of water. Xylem is a complex permanent tissue specialized for the conduction of water and mineral substances in plants.
[22] 'Insectivorous plants' trap insects for -
A.
Nitrogen
B.
Fats
C.
Vitamins
D.
Carbohydrates
Ans:
Nitrogen
Explanation :
Insectivorous plants trap insects because they grow in a soil which is deficient in nitrogen (such as acidic bogs and rock outcrops). The insects they feed on help them in fulfilling their nitrogen needs. Venus flytrap, pitcher plant, utricularia, drosera and Rafflesia are the examples of insectivorous plants.
[23] Blood Circulation was discovered by -
A.
Mary Anderson
B.
Virginia Apgar
C.
William Harvey
D.
Robert Feulgen
Ans:
William Harvey
Explanation :
Harvey also continued his study into the vascular system and in 1616 he announced his discovery of the circulation of blood within the body.
[24] Aerenchyma is present in -
A.
Banana stem
B.
Palm stem
C.
Aquatic plants
D.
Xerophytic plants
Ans:
Aquatic plants
Explanation :
A xerophyte is a species of plant that has adaptations to survive in an environment with little liquid water, such as a desert or an ice or snow-covered region in the Alps or the Arctic.
[25] Which of the following is responsible for transport of food and other substances in plants?
A.
Xylem
B.
Phloem
C.
Chloroplast
D.
None of these
Ans:
Phloem
Explanation :
The transport of water, nutrients and other substances from one part of a plant to another is called translocation. While, phloem transports synthesized food from the leaves to the rest of the plant body; water and minerals are transported from the roots upwards through the xylem tubes.
Explanation :
The Temporal Lobes, located on each side of the head above the ears, control hearing and are related to smell, taste and short-term memory.
[10] If the stomach did not produce any hydrochloric acid, which enzyme will not function?
A.
Ptyalin
B.
Rennin
C.
Pepsin
D.
Lipase
Ans:
Pepsin
Explanation :
Hydrochloric acid converts pepsinogen into an enzyme called pepsin. When food enters the stomach, hydrochloric acid production increases and the pH may fall to as low as 1 or 2, a very acidic condition.
[11] The environment includes -
A.
Abiotic factors
B.
Biotic factors
C.
Oxygen and Nitrogen
D.
Abiotic and Biotic factors
Ans:
Abiotic and Biotic factors
Explanation :
An environment encompasses all living (biotic) and non-living things (abiotic) occurring naturally on Earth. It consists of plants, animals and micro-organisms (biotic factors) in an area functioning together with all of the non-living physical (abiotic) factors.
[12] Rhizobium is a kind of -
A.
Photosynthetic bacteria
B.
Symbiotic bacteria
C.
Parasitic bacteria
D.
Saprophytic bacteria
Ans:
Symbiotic bacteria
Explanation :
Rhizobia are soil bacteria that fix nitrogen after becoming established inside root nodules of legumes. They are the only nitrogen-fixing bacteria living in a symbiotic relationship with legumes. Common crop and forage legumes are peas, beans, clover, and soy.
[13] Which one of the following is an insectivorous plant?
A.
Utricularia
B.
Sequoia Gigantia
C.
Nostoc
D.
Bryophyta
Ans:
Utricularia
Explanation :
Insectivorous plants are green plants but insectivorous habit develops due to deficiency of nitrogen in the soil. They usually grow in swampy areas. For example, Nepenthes or pitcher plant, Utricularia or bladderwort, which is a hydrophyte insectivorous plant and also a pollution indicator.
[14] Polyploidy arises due to change in the -
A.
number of chromatids
B.
structure of genes
C.
number of chromosomes
D.
structure of chromosomes
Ans:
number of chromosomes
Explanation :
An organism having more than two sets of homologous chromosomes is known as polyploid and the phenomenon polyploidy. Polyploidy refers to a numerical change in a whole set of chromosomes. Polyploidy may occur due to abnormal cell division, either during mitosis, or commonly during metaphase I in meiosis.
[15] The largest artery in human body is -
A.
Aorta
B.
Capillaiy
C.
Vena cava
D.
Pulmonary vein
Ans:
Aorta
Explanation :
The aorta is the largest artery of the human body. It is an artery that directly arises from the heart itself and descends through the thorax and into the abdomen. All the arteries of the body, save the pulmonary arteries, stem from the aorta or one of its main branches.
[16] The tree species most commonly used in social forestry is -
A.
Peepal
B.
Gulmohar
C.
Eucalyptus
D.
Mango
Ans:
Eucalyptus
Explanation :
Eucalyptus, Acacia, Polar, etc are some of the most commonly used tree species in social forestry. This is because Eucalyptus helps meet increasing wood demands from dwindling natural forests, supplying local communities and industry alike. Eucalyptus first became a component of India's social forestry program in the 1970s. With financial assistance from the World Bank, large tracts of forest lands, farms, and degraded land in the Indian states of Karnataka, Gujarat, Uttar Pradesh, Punjab and Haryana were planted with eucalyptus.
[17] The most productive ecosystem in the biosphere is -
A.
Desert
B.
Open Ocean
C.
Estuary
D.
Tundra
Ans:
Estuary
Explanation :
Ecotone regions (transitional zones) like mangroves, wetlands, estuaries, grasslands etc. have far greater productivity compared to natural ecosystems like forest ecosystem, ocean ecosystem, pond ecosystem, riverine ecosystem, desert ecosystem etc. This is because of the wide-ranging species from the adjacent ecosystems being present in the ecotone. Also, an estuary has very little wave action, so it provides a calm refuge from the open sea and hence becomes ideal for the survival of numerous aquatic species. Estuaries are most heavily populated areas throughout the world, with about 60% of the world’s population living along estuaries and the coast.
[18] Panthera Pardus is the scientific name of -
A.
Leopard
B.
Tiger
C.
Lion
D.
Panther
Ans:
Leopard
Explanation :
Panthera pardus is the scientific name of leopard, one of the five "big cats" in the genus Panthera.
[19] The plant cell will shrink when placed in -
A.
An isotonic solution
B.
Hypertonic solution
C.
Hypotonic solution
D.
Water
Ans:
Hypertonic solution
Explanation :
If a plant cell is placed in a hypertonic solution, the plant cell loses water and hence turgor pressure by plasmolysis: pressure decreases to the point where the protoplasm of the cell peels away from the cell wall, leaving gaps between the cell wall and the membrane and making the plant cell shrink and crumple.
[20] Bacterial decomposition of biological material under anaerobic condition is -
A.
fermentation
B.
fertilization
C.
contamination
D.
composting
Ans:
fermentation
Explanation :
Fermentation is the process by which complex organic compounds, such as glucose, are broken down by the action of enzymes into simpler compounds in the absence of oxygen (anaerobic). Yeasts can convert sugars to alcohol and carbon dioxide by fermentation. Fermentation is used to produce wine, beer, yogurt and other products.
[21] The only living tissue in plant xylem is -
A.
Trachea
B.
Xylem fibre
C.
Xylem parenchyma
D.
Tracheid
Ans:
Xylem parenchyma
Explanation :
Xylem parenchyma is the only living component found in xylem tissue. They are living cells associated with the xylem that are found in between the vessels arid the fibers. They act as storage house of starch and fat with assisting in conduction of water. Xylem is a complex permanent tissue specialized for the conduction of water and mineral substances in plants.
[22] 'Insectivorous plants' trap insects for -
A.
Nitrogen
B.
Fats
C.
Vitamins
D.
Carbohydrates
Ans:
Nitrogen
Explanation :
Insectivorous plants trap insects because they grow in a soil which is deficient in nitrogen (such as acidic bogs and rock outcrops). The insects they feed on help them in fulfilling their nitrogen needs. Venus flytrap, pitcher plant, utricularia, drosera and Rafflesia are the examples of insectivorous plants.
[23] Blood Circulation was discovered by -
A.
Mary Anderson
B.
Virginia Apgar
C.
William Harvey
D.
Robert Feulgen
Ans:
William Harvey
Explanation :
Harvey also continued his study into the vascular system and in 1616 he announced his discovery of the circulation of blood within the body.
[24] Aerenchyma is present in -
A.
Banana stem
B.
Palm stem
C.
Aquatic plants
D.
Xerophytic plants
Ans:
Aquatic plants
Explanation :
A xerophyte is a species of plant that has adaptations to survive in an environment with little liquid water, such as a desert or an ice or snow-covered region in the Alps or the Arctic.
[25] Which of the following is responsible for transport of food and other substances in plants?
A.
Xylem
B.
Phloem
C.
Chloroplast
D.
None of these
Ans:
Phloem
Explanation :
The transport of water, nutrients and other substances from one part of a plant to another is called translocation. While, phloem transports synthesized food from the leaves to the rest of the plant body; water and minerals are transported from the roots upwards through the xylem tubes.
Explanation :
An environment encompasses all living (biotic) and non-living things (abiotic) occurring naturally on Earth. It consists of plants, animals and micro-organisms (biotic factors) in an area functioning together with all of the non-living physical (abiotic) factors.
[12] Rhizobium is a kind of -
A.
Photosynthetic bacteria
B.
Symbiotic bacteria
C.
Parasitic bacteria
D.
Saprophytic bacteria
Ans:
Symbiotic bacteria
Explanation :
Rhizobia are soil bacteria that fix nitrogen after becoming established inside root nodules of legumes. They are the only nitrogen-fixing bacteria living in a symbiotic relationship with legumes. Common crop and forage legumes are peas, beans, clover, and soy.
[13] Which one of the following is an insectivorous plant?
A.
Utricularia
B.
Sequoia Gigantia
C.
Nostoc
D.
Bryophyta
Ans:
Utricularia
Explanation :
Insectivorous plants are green plants but insectivorous habit develops due to deficiency of nitrogen in the soil. They usually grow in swampy areas. For example, Nepenthes or pitcher plant, Utricularia or bladderwort, which is a hydrophyte insectivorous plant and also a pollution indicator.
[14] Polyploidy arises due to change in the -
A.
number of chromatids
B.
structure of genes
C.
number of chromosomes
D.
structure of chromosomes
Ans:
number of chromosomes
Explanation :
An organism having more than two sets of homologous chromosomes is known as polyploid and the phenomenon polyploidy. Polyploidy refers to a numerical change in a whole set of chromosomes. Polyploidy may occur due to abnormal cell division, either during mitosis, or commonly during metaphase I in meiosis.
[15] The largest artery in human body is -
A.
Aorta
B.
Capillaiy
C.
Vena cava
D.
Pulmonary vein
Ans:
Aorta
Explanation :
The aorta is the largest artery of the human body. It is an artery that directly arises from the heart itself and descends through the thorax and into the abdomen. All the arteries of the body, save the pulmonary arteries, stem from the aorta or one of its main branches.
[16] The tree species most commonly used in social forestry is -
A.
Peepal
B.
Gulmohar
C.
Eucalyptus
D.
Mango
Ans:
Eucalyptus
Explanation :
Eucalyptus, Acacia, Polar, etc are some of the most commonly used tree species in social forestry. This is because Eucalyptus helps meet increasing wood demands from dwindling natural forests, supplying local communities and industry alike. Eucalyptus first became a component of India's social forestry program in the 1970s. With financial assistance from the World Bank, large tracts of forest lands, farms, and degraded land in the Indian states of Karnataka, Gujarat, Uttar Pradesh, Punjab and Haryana were planted with eucalyptus.
[17] The most productive ecosystem in the biosphere is -
A.
Desert
B.
Open Ocean
C.
Estuary
D.
Tundra
Ans:
Estuary
Explanation :
Ecotone regions (transitional zones) like mangroves, wetlands, estuaries, grasslands etc. have far greater productivity compared to natural ecosystems like forest ecosystem, ocean ecosystem, pond ecosystem, riverine ecosystem, desert ecosystem etc. This is because of the wide-ranging species from the adjacent ecosystems being present in the ecotone. Also, an estuary has very little wave action, so it provides a calm refuge from the open sea and hence becomes ideal for the survival of numerous aquatic species. Estuaries are most heavily populated areas throughout the world, with about 60% of the world’s population living along estuaries and the coast.
[18] Panthera Pardus is the scientific name of -
A.
Leopard
B.
Tiger
C.
Lion
D.
Panther
Ans:
Leopard
Explanation :
Panthera pardus is the scientific name of leopard, one of the five "big cats" in the genus Panthera.
[19] The plant cell will shrink when placed in -
A.
An isotonic solution
B.
Hypertonic solution
C.
Hypotonic solution
D.
Water
Ans:
Hypertonic solution
Explanation :
If a plant cell is placed in a hypertonic solution, the plant cell loses water and hence turgor pressure by plasmolysis: pressure decreases to the point where the protoplasm of the cell peels away from the cell wall, leaving gaps between the cell wall and the membrane and making the plant cell shrink and crumple.
[20] Bacterial decomposition of biological material under anaerobic condition is -
A.
fermentation
B.
fertilization
C.
contamination
D.
composting
Ans:
fermentation
Explanation :
Fermentation is the process by which complex organic compounds, such as glucose, are broken down by the action of enzymes into simpler compounds in the absence of oxygen (anaerobic). Yeasts can convert sugars to alcohol and carbon dioxide by fermentation. Fermentation is used to produce wine, beer, yogurt and other products.
[21] The only living tissue in plant xylem is -
A.
Trachea
B.
Xylem fibre
C.
Xylem parenchyma
D.
Tracheid
Ans:
Xylem parenchyma
Explanation :
Xylem parenchyma is the only living component found in xylem tissue. They are living cells associated with the xylem that are found in between the vessels arid the fibers. They act as storage house of starch and fat with assisting in conduction of water. Xylem is a complex permanent tissue specialized for the conduction of water and mineral substances in plants.
[22] 'Insectivorous plants' trap insects for -
A.
Nitrogen
B.
Fats
C.
Vitamins
D.
Carbohydrates
Ans:
Nitrogen
Explanation :
Insectivorous plants trap insects because they grow in a soil which is deficient in nitrogen (such as acidic bogs and rock outcrops). The insects they feed on help them in fulfilling their nitrogen needs. Venus flytrap, pitcher plant, utricularia, drosera and Rafflesia are the examples of insectivorous plants.
[23] Blood Circulation was discovered by -
A.
Mary Anderson
B.
Virginia Apgar
C.
William Harvey
D.
Robert Feulgen
Ans:
William Harvey
Explanation :
Harvey also continued his study into the vascular system and in 1616 he announced his discovery of the circulation of blood within the body.
[24] Aerenchyma is present in -
A.
Banana stem
B.
Palm stem
C.
Aquatic plants
D.
Xerophytic plants
Ans:
Aquatic plants
Explanation :
A xerophyte is a species of plant that has adaptations to survive in an environment with little liquid water, such as a desert or an ice or snow-covered region in the Alps or the Arctic.
[25] Which of the following is responsible for transport of food and other substances in plants?
A.
Xylem
B.
Phloem
C.
Chloroplast
D.
None of these
Ans:
Phloem
Explanation :
The transport of water, nutrients and other substances from one part of a plant to another is called translocation. While, phloem transports synthesized food from the leaves to the rest of the plant body; water and minerals are transported from the roots upwards through the xylem tubes.
Explanation :
Insectivorous plants are green plants but insectivorous habit develops due to deficiency of nitrogen in the soil. They usually grow in swampy areas. For example, Nepenthes or pitcher plant, Utricularia or bladderwort, which is a hydrophyte insectivorous plant and also a pollution indicator.
[14] Polyploidy arises due to change in the -
A.
number of chromatids
B.
structure of genes
C.
number of chromosomes
D.
structure of chromosomes
Ans:
number of chromosomes
Explanation :
An organism having more than two sets of homologous chromosomes is known as polyploid and the phenomenon polyploidy. Polyploidy refers to a numerical change in a whole set of chromosomes. Polyploidy may occur due to abnormal cell division, either during mitosis, or commonly during metaphase I in meiosis.
[15] The largest artery in human body is -
A.
Aorta
B.
Capillaiy
C.
Vena cava
D.
Pulmonary vein
Ans:
Aorta
Explanation :
The aorta is the largest artery of the human body. It is an artery that directly arises from the heart itself and descends through the thorax and into the abdomen. All the arteries of the body, save the pulmonary arteries, stem from the aorta or one of its main branches.
[16] The tree species most commonly used in social forestry is -
A.
Peepal
B.
Gulmohar
C.
Eucalyptus
D.
Mango
Ans:
Eucalyptus
Explanation :
Eucalyptus, Acacia, Polar, etc are some of the most commonly used tree species in social forestry. This is because Eucalyptus helps meet increasing wood demands from dwindling natural forests, supplying local communities and industry alike. Eucalyptus first became a component of India's social forestry program in the 1970s. With financial assistance from the World Bank, large tracts of forest lands, farms, and degraded land in the Indian states of Karnataka, Gujarat, Uttar Pradesh, Punjab and Haryana were planted with eucalyptus.
[17] The most productive ecosystem in the biosphere is -
A.
Desert
B.
Open Ocean
C.
Estuary
D.
Tundra
Ans:
Estuary
Explanation :
Ecotone regions (transitional zones) like mangroves, wetlands, estuaries, grasslands etc. have far greater productivity compared to natural ecosystems like forest ecosystem, ocean ecosystem, pond ecosystem, riverine ecosystem, desert ecosystem etc. This is because of the wide-ranging species from the adjacent ecosystems being present in the ecotone. Also, an estuary has very little wave action, so it provides a calm refuge from the open sea and hence becomes ideal for the survival of numerous aquatic species. Estuaries are most heavily populated areas throughout the world, with about 60% of the world’s population living along estuaries and the coast.
[18] Panthera Pardus is the scientific name of -
A.
Leopard
B.
Tiger
C.
Lion
D.
Panther
Ans:
Leopard
Explanation :
Panthera pardus is the scientific name of leopard, one of the five "big cats" in the genus Panthera.
[19] The plant cell will shrink when placed in -
A.
An isotonic solution
B.
Hypertonic solution
C.
Hypotonic solution
D.
Water
Ans:
Hypertonic solution
Explanation :
If a plant cell is placed in a hypertonic solution, the plant cell loses water and hence turgor pressure by plasmolysis: pressure decreases to the point where the protoplasm of the cell peels away from the cell wall, leaving gaps between the cell wall and the membrane and making the plant cell shrink and crumple.
[20] Bacterial decomposition of biological material under anaerobic condition is -
A.
fermentation
B.
fertilization
C.
contamination
D.
composting
Ans:
fermentation
Explanation :
Fermentation is the process by which complex organic compounds, such as glucose, are broken down by the action of enzymes into simpler compounds in the absence of oxygen (anaerobic). Yeasts can convert sugars to alcohol and carbon dioxide by fermentation. Fermentation is used to produce wine, beer, yogurt and other products.
[21] The only living tissue in plant xylem is -
A.
Trachea
B.
Xylem fibre
C.
Xylem parenchyma
D.
Tracheid
Ans:
Xylem parenchyma
Explanation :
Xylem parenchyma is the only living component found in xylem tissue. They are living cells associated with the xylem that are found in between the vessels arid the fibers. They act as storage house of starch and fat with assisting in conduction of water. Xylem is a complex permanent tissue specialized for the conduction of water and mineral substances in plants.
[22] 'Insectivorous plants' trap insects for -
A.
Nitrogen
B.
Fats
C.
Vitamins
D.
Carbohydrates
Ans:
Nitrogen
Explanation :
Insectivorous plants trap insects because they grow in a soil which is deficient in nitrogen (such as acidic bogs and rock outcrops). The insects they feed on help them in fulfilling their nitrogen needs. Venus flytrap, pitcher plant, utricularia, drosera and Rafflesia are the examples of insectivorous plants.
[23] Blood Circulation was discovered by -
A.
Mary Anderson
B.
Virginia Apgar
C.
William Harvey
D.
Robert Feulgen
Ans:
William Harvey
Explanation :
Harvey also continued his study into the vascular system and in 1616 he announced his discovery of the circulation of blood within the body.
[24] Aerenchyma is present in -
A.
Banana stem
B.
Palm stem
C.
Aquatic plants
D.
Xerophytic plants
Ans:
Aquatic plants
Explanation :
A xerophyte is a species of plant that has adaptations to survive in an environment with little liquid water, such as a desert or an ice or snow-covered region in the Alps or the Arctic.
[25] Which of the following is responsible for transport of food and other substances in plants?
A.
Xylem
B.
Phloem
C.
Chloroplast
D.
None of these
Ans:
Phloem
Explanation :
The transport of water, nutrients and other substances from one part of a plant to another is called translocation. While, phloem transports synthesized food from the leaves to the rest of the plant body; water and minerals are transported from the roots upwards through the xylem tubes.
Explanation :
The aorta is the largest artery of the human body. It is an artery that directly arises from the heart itself and descends through the thorax and into the abdomen. All the arteries of the body, save the pulmonary arteries, stem from the aorta or one of its main branches.
[16] The tree species most commonly used in social forestry is -
A.
Peepal
B.
Gulmohar
C.
Eucalyptus
D.
Mango
Ans:
Eucalyptus
Explanation :
Eucalyptus, Acacia, Polar, etc are some of the most commonly used tree species in social forestry. This is because Eucalyptus helps meet increasing wood demands from dwindling natural forests, supplying local communities and industry alike. Eucalyptus first became a component of India's social forestry program in the 1970s. With financial assistance from the World Bank, large tracts of forest lands, farms, and degraded land in the Indian states of Karnataka, Gujarat, Uttar Pradesh, Punjab and Haryana were planted with eucalyptus.
[17] The most productive ecosystem in the biosphere is -
A.
Desert
B.
Open Ocean
C.
Estuary
D.
Tundra
Ans:
Estuary
Explanation :
Ecotone regions (transitional zones) like mangroves, wetlands, estuaries, grasslands etc. have far greater productivity compared to natural ecosystems like forest ecosystem, ocean ecosystem, pond ecosystem, riverine ecosystem, desert ecosystem etc. This is because of the wide-ranging species from the adjacent ecosystems being present in the ecotone. Also, an estuary has very little wave action, so it provides a calm refuge from the open sea and hence becomes ideal for the survival of numerous aquatic species. Estuaries are most heavily populated areas throughout the world, with about 60% of the world’s population living along estuaries and the coast.
[18] Panthera Pardus is the scientific name of -
A.
Leopard
B.
Tiger
C.
Lion
D.
Panther
Ans:
Leopard
Explanation :
Panthera pardus is the scientific name of leopard, one of the five "big cats" in the genus Panthera.
[19] The plant cell will shrink when placed in -
A.
An isotonic solution
B.
Hypertonic solution
C.
Hypotonic solution
D.
Water
Ans:
Hypertonic solution
Explanation :
If a plant cell is placed in a hypertonic solution, the plant cell loses water and hence turgor pressure by plasmolysis: pressure decreases to the point where the protoplasm of the cell peels away from the cell wall, leaving gaps between the cell wall and the membrane and making the plant cell shrink and crumple.
[20] Bacterial decomposition of biological material under anaerobic condition is -
A.
fermentation
B.
fertilization
C.
contamination
D.
composting
Ans:
fermentation
Explanation :
Fermentation is the process by which complex organic compounds, such as glucose, are broken down by the action of enzymes into simpler compounds in the absence of oxygen (anaerobic). Yeasts can convert sugars to alcohol and carbon dioxide by fermentation. Fermentation is used to produce wine, beer, yogurt and other products.
[21] The only living tissue in plant xylem is -
A.
Trachea
B.
Xylem fibre
C.
Xylem parenchyma
D.
Tracheid
Ans:
Xylem parenchyma
Explanation :
Xylem parenchyma is the only living component found in xylem tissue. They are living cells associated with the xylem that are found in between the vessels arid the fibers. They act as storage house of starch and fat with assisting in conduction of water. Xylem is a complex permanent tissue specialized for the conduction of water and mineral substances in plants.
[22] 'Insectivorous plants' trap insects for -
A.
Nitrogen
B.
Fats
C.
Vitamins
D.
Carbohydrates
Ans:
Nitrogen
Explanation :
Insectivorous plants trap insects because they grow in a soil which is deficient in nitrogen (such as acidic bogs and rock outcrops). The insects they feed on help them in fulfilling their nitrogen needs. Venus flytrap, pitcher plant, utricularia, drosera and Rafflesia are the examples of insectivorous plants.
[23] Blood Circulation was discovered by -
A.
Mary Anderson
B.
Virginia Apgar
C.
William Harvey
D.
Robert Feulgen
Ans:
William Harvey
Explanation :
Harvey also continued his study into the vascular system and in 1616 he announced his discovery of the circulation of blood within the body.
[24] Aerenchyma is present in -
A.
Banana stem
B.
Palm stem
C.
Aquatic plants
D.
Xerophytic plants
Ans:
Aquatic plants
Explanation :
A xerophyte is a species of plant that has adaptations to survive in an environment with little liquid water, such as a desert or an ice or snow-covered region in the Alps or the Arctic.
[25] Which of the following is responsible for transport of food and other substances in plants?
A.
Xylem
B.
Phloem
C.
Chloroplast
D.
None of these
Ans:
Phloem
Explanation :
The transport of water, nutrients and other substances from one part of a plant to another is called translocation. While, phloem transports synthesized food from the leaves to the rest of the plant body; water and minerals are transported from the roots upwards through the xylem tubes.
Explanation :
Ecotone regions (transitional zones) like mangroves, wetlands, estuaries, grasslands etc. have far greater productivity compared to natural ecosystems like forest ecosystem, ocean ecosystem, pond ecosystem, riverine ecosystem, desert ecosystem etc. This is because of the wide-ranging species from the adjacent ecosystems being present in the ecotone. Also, an estuary has very little wave action, so it provides a calm refuge from the open sea and hence becomes ideal for the survival of numerous aquatic species. Estuaries are most heavily populated areas throughout the world, with about 60% of the world’s population living along estuaries and the coast.
[18] Panthera Pardus is the scientific name of -
A.
Leopard
B.
Tiger
C.
Lion
D.
Panther
Ans:
Leopard
Explanation :
Panthera pardus is the scientific name of leopard, one of the five "big cats" in the genus Panthera.
[19] The plant cell will shrink when placed in -
A.
An isotonic solution
B.
Hypertonic solution
C.
Hypotonic solution
D.
Water
Ans:
Hypertonic solution
Explanation :
If a plant cell is placed in a hypertonic solution, the plant cell loses water and hence turgor pressure by plasmolysis: pressure decreases to the point where the protoplasm of the cell peels away from the cell wall, leaving gaps between the cell wall and the membrane and making the plant cell shrink and crumple.
[20] Bacterial decomposition of biological material under anaerobic condition is -
A.
fermentation
B.
fertilization
C.
contamination
D.
composting
Ans:
fermentation
Explanation :
Fermentation is the process by which complex organic compounds, such as glucose, are broken down by the action of enzymes into simpler compounds in the absence of oxygen (anaerobic). Yeasts can convert sugars to alcohol and carbon dioxide by fermentation. Fermentation is used to produce wine, beer, yogurt and other products.
[21] The only living tissue in plant xylem is -
A.
Trachea
B.
Xylem fibre
C.
Xylem parenchyma
D.
Tracheid
Ans:
Xylem parenchyma
Explanation :
Xylem parenchyma is the only living component found in xylem tissue. They are living cells associated with the xylem that are found in between the vessels arid the fibers. They act as storage house of starch and fat with assisting in conduction of water. Xylem is a complex permanent tissue specialized for the conduction of water and mineral substances in plants.
[22] 'Insectivorous plants' trap insects for -
A.
Nitrogen
B.
Fats
C.
Vitamins
D.
Carbohydrates
Ans:
Nitrogen
Explanation :
Insectivorous plants trap insects because they grow in a soil which is deficient in nitrogen (such as acidic bogs and rock outcrops). The insects they feed on help them in fulfilling their nitrogen needs. Venus flytrap, pitcher plant, utricularia, drosera and Rafflesia are the examples of insectivorous plants.
[23] Blood Circulation was discovered by -
A.
Mary Anderson
B.
Virginia Apgar
C.
William Harvey
D.
Robert Feulgen
Ans:
William Harvey
Explanation :
Harvey also continued his study into the vascular system and in 1616 he announced his discovery of the circulation of blood within the body.
[24] Aerenchyma is present in -
A.
Banana stem
B.
Palm stem
C.
Aquatic plants
D.
Xerophytic plants
Ans:
Aquatic plants
Explanation :
A xerophyte is a species of plant that has adaptations to survive in an environment with little liquid water, such as a desert or an ice or snow-covered region in the Alps or the Arctic.
[25] Which of the following is responsible for transport of food and other substances in plants?
A.
Xylem
B.
Phloem
C.
Chloroplast
D.
None of these
Ans:
Phloem
Explanation :
The transport of water, nutrients and other substances from one part of a plant to another is called translocation. While, phloem transports synthesized food from the leaves to the rest of the plant body; water and minerals are transported from the roots upwards through the xylem tubes.
Explanation :
If a plant cell is placed in a hypertonic solution, the plant cell loses water and hence turgor pressure by plasmolysis: pressure decreases to the point where the protoplasm of the cell peels away from the cell wall, leaving gaps between the cell wall and the membrane and making the plant cell shrink and crumple.
[20] Bacterial decomposition of biological material under anaerobic condition is -
A.
fermentation
B.
fertilization
C.
contamination
D.
composting
Ans:
fermentation
Explanation :
Fermentation is the process by which complex organic compounds, such as glucose, are broken down by the action of enzymes into simpler compounds in the absence of oxygen (anaerobic). Yeasts can convert sugars to alcohol and carbon dioxide by fermentation. Fermentation is used to produce wine, beer, yogurt and other products.
[21] The only living tissue in plant xylem is -
A.
Trachea
B.
Xylem fibre
C.
Xylem parenchyma
D.
Tracheid
Ans:
Xylem parenchyma
Explanation :
Xylem parenchyma is the only living component found in xylem tissue. They are living cells associated with the xylem that are found in between the vessels arid the fibers. They act as storage house of starch and fat with assisting in conduction of water. Xylem is a complex permanent tissue specialized for the conduction of water and mineral substances in plants.
[22] 'Insectivorous plants' trap insects for -
A.
Nitrogen
B.
Fats
C.
Vitamins
D.
Carbohydrates
Ans:
Nitrogen
Explanation :
Insectivorous plants trap insects because they grow in a soil which is deficient in nitrogen (such as acidic bogs and rock outcrops). The insects they feed on help them in fulfilling their nitrogen needs. Venus flytrap, pitcher plant, utricularia, drosera and Rafflesia are the examples of insectivorous plants.
[23] Blood Circulation was discovered by -
A.
Mary Anderson
B.
Virginia Apgar
C.
William Harvey
D.
Robert Feulgen
Ans:
William Harvey
Explanation :
Harvey also continued his study into the vascular system and in 1616 he announced his discovery of the circulation of blood within the body.
[24] Aerenchyma is present in -
A.
Banana stem
B.
Palm stem
C.
Aquatic plants
D.
Xerophytic plants
Ans:
Aquatic plants
Explanation :
A xerophyte is a species of plant that has adaptations to survive in an environment with little liquid water, such as a desert or an ice or snow-covered region in the Alps or the Arctic.
[25] Which of the following is responsible for transport of food and other substances in plants?
A.
Xylem
B.
Phloem
C.
Chloroplast
D.
None of these
Ans:
Phloem
Explanation :
The transport of water, nutrients and other substances from one part of a plant to another is called translocation. While, phloem transports synthesized food from the leaves to the rest of the plant body; water and minerals are transported from the roots upwards through the xylem tubes.
Explanation :
Xylem parenchyma is the only living component found in xylem tissue. They are living cells associated with the xylem that are found in between the vessels arid the fibers. They act as storage house of starch and fat with assisting in conduction of water. Xylem is a complex permanent tissue specialized for the conduction of water and mineral substances in plants.
[22] 'Insectivorous plants' trap insects for -
A.
Nitrogen
B.
Fats
C.
Vitamins
D.
Carbohydrates
Ans:
Nitrogen
Explanation :
Insectivorous plants trap insects because they grow in a soil which is deficient in nitrogen (such as acidic bogs and rock outcrops). The insects they feed on help them in fulfilling their nitrogen needs. Venus flytrap, pitcher plant, utricularia, drosera and Rafflesia are the examples of insectivorous plants.
[23] Blood Circulation was discovered by -
A.
Mary Anderson
B.
Virginia Apgar
C.
William Harvey
D.
Robert Feulgen
Ans:
William Harvey
Explanation :
Harvey also continued his study into the vascular system and in 1616 he announced his discovery of the circulation of blood within the body.
[24] Aerenchyma is present in -
A.
Banana stem
B.
Palm stem
C.
Aquatic plants
D.
Xerophytic plants
Ans:
Aquatic plants
Explanation :
A xerophyte is a species of plant that has adaptations to survive in an environment with little liquid water, such as a desert or an ice or snow-covered region in the Alps or the Arctic.
[25] Which of the following is responsible for transport of food and other substances in plants?
A.
Xylem
B.
Phloem
C.
Chloroplast
D.
None of these
Ans:
Phloem
Explanation :
The transport of water, nutrients and other substances from one part of a plant to another is called translocation. While, phloem transports synthesized food from the leaves to the rest of the plant body; water and minerals are transported from the roots upwards through the xylem tubes.
Explanation :
Harvey also continued his study into the vascular system and in 1616 he announced his discovery of the circulation of blood within the body.
[24] Aerenchyma is present in -
A.
Banana stem
B.
Palm stem
C.
Aquatic plants
D.
Xerophytic plants
Ans:
Aquatic plants
Explanation :
A xerophyte is a species of plant that has adaptations to survive in an environment with little liquid water, such as a desert or an ice or snow-covered region in the Alps or the Arctic.
[25] Which of the following is responsible for transport of food and other substances in plants?
A.
Xylem
B.
Phloem
C.
Chloroplast
D.
None of these
Ans:
Phloem
Explanation :
The transport of water, nutrients and other substances from one part of a plant to another is called translocation. While, phloem transports synthesized food from the leaves to the rest of the plant body; water and minerals are transported from the roots upwards through the xylem tubes.
Explanation :
The transport of water, nutrients and other substances from one part of a plant to another is called translocation. While, phloem transports synthesized food from the leaves to the rest of the plant body; water and minerals are transported from the roots upwards through the xylem tubes.