Biology MCQs

11. How Green plants in the sea are useful for the respiration of fish? (UPSC Prelims 1979).
[A] They give out oxygen
[B] They give out carbon dioxide
[C] The give out oxygen and carbon dioxide simultaneously
[D] They take oxygen and give out carbon dioxide

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12. Which of the following glands control temperature in human beings? (UPSC Prelims 1987)
[A] Pituitary gland
[B] Thyroid gland
[C] Hypothalamus gland
[D] Adrenal gland

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13. Natural rubber is a plant product which is chemically known by which of the following names? (UPSC Prelims 1992)
[A] Mucilage
[B] Gum
[C] Latex
[D] Resin

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14. Which of the following is the name given to the cellular and molecular control of programmed cell death? (UPSC Prelims 2001)
[A] Apoptosis
[B] Ageing
[C] Degeneration
[D] Necrosis

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15. Which of the following features of DNA makes in uniquely suited to store and transmit genetic information from generation to generation? (UPSC Prelims 2001)
[A] Complementarity of the two stands
[B] Double helix
[C] Number of base-pairs per turn
[D] Sugar-phosphate backbone

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16. Consider the following statements:
I. Meningococcal Meningitis is transmitted from person to person by mosquito bites.
II. Vomitting and neck pain are two of the symptoms of Meningococcal Meningitis.
Which of the statements given above is/are correct? (UPSC Prelims 2006)
[A] I only
[B] II only
[C] Both I and II
[D] Neither I nor II

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17. In which of the following β-oxidation mainly occurs?
[A] Mitochondria

[B] Cytoplasm

[C] Nucleus
[D] Chloroplast

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18. A segment of DNA consists of 120 adenine and 120 cytosine bases. What is the total number of nucleotides present in the segment?
[A] 120
[B] 240
[C] 345
[D] 480

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19. Which virus belongs to the family Caliciviridae?
[A] Hepatitis B virus
[B] Hepatitis D virus
[C] Hepatitis E virus
[D] All of these

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20. Which of the following is primarily associated with forage preservation?
[A] Lactobacillus bucheri
[B] Lactobacillus cacaonum
[C] Monosodium glutamate
[D] Lactobacillus casei

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