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
Other questions on Biology
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