Biology MCQs

11. How does calcium carbide ripen mangoes?
[A] It reacts with moisture and releases Ethylene
[B] It reacts with moisture and releases Acetaldehyde, which in turn releases ethylene
[C] It reacts with starch and releases Acetylene
[D] It reacts with moisture and releases Ethyne

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12. What do we call the roots of some orchid plants, which hang in the air and absorb moisture from it?
[A] Assimilatory Roots
[B] Epiphytic Roots
[C] Sucking Roots
[D] Stilt Roots

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13. ‘Dendrochronology’ is the study of the age of which of the following?
[A] Woody Plants
[B] Shrubs
[C] Fungi
[D] All of the above

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14. Which of the following is the lowest taxonomic division shared by both man and frog?
[A] Order
[B] Class
[C] Phylum
[D] Family

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15. Which of the following is a non-poisonous snake?
[A] Python
[B] Hognose snake
[C] Garter snake
[D] Ribbon snake

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16. Entomology is associated with the study of which of the following?
[A] Behavior of human beings
[B] Insects
[C] The origin and history of technical and scientific terms
[D] The formation of rocks

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17. Amoeba, malarial parasites and typhoid bacillus belongs to which of the following categories? (UPSC Prelims 1983)
[A] Anthropods
[B] Protozoa
[C] Mollusca
[D] Pisces

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18. Malaria fever is caused by which of the following reasons? (UPSC Prelims 1991)
[A] Immediately after mosquito bite
[B] Upon disintegration and bursting of red blood cells
[C] When the malaria causing germs reach the liver
[D] Upon release of toxins into blood

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19. Haemoglobin is dissolved in the plasma of which of the following animals? (UPSC Prelims 1994)
[A] frog
[B] fish
[C] man
[D] earthworm

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20. The sequencing of the entire genome (the totality of all genes) of an organism was completed in 1996. Which one of the following was that organism? (UPSC Prelims 1997)
[A] Albino mouse
[B] yeast
[C] human being
[D] Plasmodium vivax

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