Biology MCQs

11. Which of the following is the main constituent of the Gobar gas? (UPSC Prelims 1979).
[A] Carbon dioxide
[B] Methane
[C] Ethylene
[D] Carbon monoxide

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12. How the body temperature is maintained?
[A] Due to temperature regulating mechanism located in the base of the brain
[B] Due to excessive intake of water
[C] Due to regular intake of foods
[D] Due to the constant flow of blood in the capillaries

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13. Which one of the following types of micro-organisms is most widely used in industries? (UPSC Prelims 1998)
[A] Bacteria
[B] Bacteria and fungi
[C] Bacteria and algae
[D] Bacteria, micro-algae and fungi

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14. Which vitamin is also called as “Pantothenic acid”?
[A] Vitamin K
[B] Vitamin D
[C] Vitamin B3
[D] Vitamin B5

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15. Which among the following vitamins is absent in an egg?
[A] Vitamin D
[B] Vitamin C
[C] Vitamin A
[D] Vitamin K

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16. Which device is used to measure the growth in plants?
[A] Anemograph
[B] Seismograph
[C] Crescograph
[D] All the above

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17. Gonyaulax, which are known for causing red tides, belong to which of the following?
[A] Algae
[B] Fungi
[C] Protista
[D] Bacteria

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18. The study of cell biology is related to which of the following?
[A] the cell is the fundamental unit of life
[B] cell structure and function
[C] Both 1 & 2
[D] None of these

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19. Why lysosomes are called suicidal bags?
[A] because it contains digestive enzymes
[B] because it contains endoplasmic reticulum
[C] because it contains Phospholipids
[D] None of these

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20. 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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