Which one of the following is synthesised in human body that dilates blood vessels and increases blood flow ?
- (a)Nitric oxide
- (b)Nitrous oxide
- (c)Nitrogen dioxide
- (d)Nitrogen pentoxide
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Official answer(a) Nitric oxide
Biology
97 questions in Science & Technology.
Asked in 2024, 2022, 2021, 2020, 2019, 2014, 2013, 2012, 2011, 2010, 2009, 2008
Which one of the following statements best describes the role of B cells and T cells in the human body ?
- (a)They protect the body from environmental allergens.
- (b)They alleviate the body’s pain and inflammation.
- (c)They act as immunosuppressants in the body.
- (d)They protect the body from the diseases caused by pathogens.
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Official answer(d) They protect the body from the diseases caused by pathogens.
Which of the following have species that can establish symbiotic relationship with other organisms? 1. Cnidarians 2. Fungi 3. Protozoa Select the correct answer using the code given below.
- (a)1 and 2 only
- (b)2 and 3 only
- (c)1 and 3 only
- (d)1, 2 and 3
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Official answer(d) 1, 2 and 3
Which of the following statements are correct regarding the general difference between plant and animal cells ? 1. Plant cells have cellulose cell walls whilst animal cells do not. 2. Plant cells do not have plasma membrane unlike animal cells which do. 3. Mature plant cell has one large vacuole whilst animal cell has many small vacuoles. Select the correct answer using the code given below :
- (a)1 and 2 only
- (b)2 and 3 only
- (c)1 and 3 only
- (d)1, 2 and 3
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Official answer(c) 1 and 3 only
The word 'Denisovan' is sometimes mentioned in media in reference to
- (a)fossils of a kind of dinosaurs
- (b)an early human species
- (c)a cave system found in North-East India
- (d)a geological period in the history of Indian subcontinent
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Official answer(b) an early human species
Which of the following phenomena might have influenced the evolution of organisms? 1. Continental drift 2. Glacial cycles Select the correct answer using the code given below.
- (a)1 only
- (b)2 only
- (c)Both 1 and 2
- (d)Neither 1 nor 2
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Official answer(c) Both 1 and 2
Consider the following : 1. Bats 2. Bears 3. Rodents The phenomenon of hibernation can be observed in which of the above kinds of animals?
- (a)1 and 2 only
- (b)2 only
- (c)1, 2 and 3
- (d)Hibernation cannot be observed in any of the above
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Official answer(c) 1, 2 and 3
Lichens, which are capable of initiating ecological succession even on a bare rock, are actually a symbiotic association of
- (a)algae and bacteria
- (b)algae and fungi
- (c)bacteria and fungi
- (d)fungi and mosses
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Official answer(b) algae and fungi
Which one of the following is the process involved in photosynthesis?
- (a)Potential energy is released to form free energy
- (b)Free energy is converted into potential energy and stored
- (c)Food is oxidized to release carbon dioxide and water
- (d)Oxygen is taken, and carbon dioxide and water vapour are given out
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Official answer(b) Free energy is converted into potential energy and stored
Consider the following statements : 1. Maize can be used for the production of starch. 2. Oil extracted from maize can be a feedstock for biodiesel. 3. Alcoholic beverages can be produced by using maize. Which of the statements given above is/are correct?
- (a)1 only
- (b)1 and 2 only
- (c)2 and 3 only
- (d)1, 2 and 3
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Official answer(d) 1, 2 and 3
Among the following organisms, which one does not belong to the class of other three?
- (a)Crab
- (b)Mite
- (c)Scorpion
- (d)Spider
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Official answer(a) Crab
Consider the following minerals: 1. Calcium 2. Iron 3. Sodium Which of the minerals given above is/are required by human body for the contraction of muscles?
- (a)1 only
- (b)2 and 3 only
- (c)1 and 3 only
- (d)1, 2 and 3
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Official answer(d) 1, 2 and 3
Fruits stored in a cold chamber exhibit longer storage life because
- (a)exposure to sunlight is prevented
- (b)concentration of carbon dioxide in the environment is increased
- (c)rate of respiration is decreased
- (d)there is an increase in humidity
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Official answer(c) rate of respiration is decreased
Many transplanted seedlings do not grow because
- (a)the new soil does not contain favourable minerals
- (b)most of the root hairs grip the new soil too hard
- (c)most of the root hairs are lost during transplantation
- (d)leaves get damaged during transplantation
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Official answer(c) most of the root hairs are lost during transplantation
Which one of the following sets of elements was primarily responsible for the origin of life on the Earth?
- (a)Hydrogen, Oxygen, Sodium
- (b)Carbon, Hydrogen, Nitrogen
- (c)Oxygen, Calcium, Phosphorus
- (d)Carbon, Hydrogen, Potassium
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Official answer(b) Carbon, Hydrogen, Nitrogen
When the bark of a tree is removed in a circular fashion all around near its base, it gradually dries up and dies because
- (a)Water from soil cannot rise to aerial parts
- (b)Roots are starved of energy
- (c)Tree is infected by soil microbes
- (d)Roots do not receive oxygen for respiration
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Official answer(b) Roots are starved of energy
Which one of the following processes in the bodies of living organisms is a digestive process ?
- (a)Breakdown of proteins into amino acids
- (b)Breakdown of glucose into CO₂ and H₂O
- (c)Conversion of glucose into glycogen
- (d)Conversion of amino acids into proteins
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Official answer(a) Breakdown of proteins into amino acids
From the point of view of evolution of living organisms, which one of the following is the correct sequence of evolution ?
- (a)Otter – Tortoise – Shark
- (b)Shark – Tortoise – Otter
- (c)Tortoise – Shark – Otter
- (d)Shark – Otter – Tortoise
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Official answer(b) Shark – Tortoise – Otter
Consider the following statements: 1. Sweet orange plant is propagated by grafting technique. 2. Jasmine plant is propagated by layering technique. Which of the statements given above is/are correct?
- (a)1 only
- (b)2 only
- (c)Both 1 and 2
- (d)Neither 1 nor 2
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Official answer(c) Both 1 and 2
Consider the following : 1. Camphor 2. Chicory 3. Vanilla Which of the above is/are plant product(s) ?
- (a)1 and 2 only
- (b)3 only
- (c)1 and 3 only
- (d)1, 2 and 3
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Official answer(d) 1, 2 and 3
In the context of Indian wild life, the flying fox is a
- (a)Bat
- (b)Kite
- (c)Stork
- (d)Vulture
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Official answer(a) Bat
In making the saffron spice, which one of the following parts of the plant is used ?
- (a)Leaf
- (b)Petal
- (c)Sepal
- (d)Stigma
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Official answer(d) Stigma
With reference to the evolution of living organisms, which one of the following sequences is correct?
- (a)Octopus – Dolphin – Shark
- (b)Pangolin – Tortoise – Hawk
- (c)Salamander – Python – Kangaroo
- (d)Frog – Crab – Prawn
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Official answer(c) Salamander – Python – Kangaroo
In which one of the following kinds of organisms is the phenomenon found wherein the female kills the male after copulation?
- (a)Dragonfly
- (b)Honeybee
- (c)Spider
- (d)Pit viper
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Official answer(c) Spider
Which one of the following is an insectivorous plant?
- (a)Passion flower plant
- (b)Pitcher plant
- (c)Night queen
- (d)Flame of the forest
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Official answer(b) Pitcher plant