Biology MCQs

11. Which of the following features of the human immunodeficiency virus (HIV) makes it a living entity? (UPSC Prelims 1990)
[A] Excrete in human serum
[B] Disturb host cell respiration
[C] Undergo auto-reproduction
[D] Move from one cell to another

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12. Most of the desert plants bloom during night time due to which of the following reasons? (UPSC Prelims 1995)
[A] their blooming is controlled by low temperature
[B] they are sensitive to the phases of the moon
[C] the desert insects eat away flowers during day time
[D] the desert insects are active during night time

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13. Which of the following cell organelles play the most significant role in protein synthesis? (UPSC Prelims 2001)
[A] Lysosome and Centrosome
[B] Endoplasmic reticulum and Ribosome
[C] Golgi apparatus and Mitochondria
[D] Lysosome and Mitochondria

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14. Which gas is released during the process of photosynthesis in plants?
[A] Carbon dioxide
[B] Methane
[C] Oxygen
[D] Nitrogen

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15. Study of Porifera (sponges) is known as __?
[A] Parazoology
[B] Palaeozoology
[C] Zoophytology
[D] None of these

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16. Which bacteria are used in production of biogas/gobar gas plants?
[A] Methanogens
[B] Ethanogens
[C] Propanogens

[D] N-butane

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17. Which of the following occurs in Bryophytes?
[A] Great economic value
[B] No value at all
[C] Great ecological importance
[D] A lot of aesthetic value

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18. Dicotyledonous branches are found in which of the following?
[A] Fern
[B] Funaria
[C] Liverworts
[D] Marchantia

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19. Which is used as Weedicide?
[A] Indole-3-butyric acid
[B] 2,4-dichlorophenoxyacetic acid
[C] Indole-3-Acetic Acid
[D] None of these

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20. Flowers having both androecium and gynoecium are called?
[A] Bisexual flowers
[B] Anther
[C] Stamens
[D] Unisexual flowers

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