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. The primary function of Phylloclade in many plants is __?
[A] Protection from herbivores
[B] Production of food
[C] Attracting insects for pollination
[D] None of the above

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13. Who among the following proposed the Five Kingdom Classification?
[A] R.H. Whittaker
[B] Linnaeus
[C] Carl Woese
[D] Smith Fox

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14. Aves have evolved from which of the following?
[A] Amphibians
[B] Arthropods
[C] Mammals
[D] Reptiles

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15. Guttation takes place due to the development of which of the following?
[A] Cells
[B] Transpiration
[C] Root pressure
[D] All of the above

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16. Where in the human body is the stapedius muscle situated?
[A] Nose
[B] Ears
[C] Leg
[D] Eyes

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17. Which of the following clearly defines Chlorophyll? (UPSC Prelims 1982)
[A] Halogen acid
[B] A green pigment found in the plants
[C] A chloro-organic compound
[D] Element

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18. For developing in bred lines in farm animals, following factors are taken into consideration:

  1. The crossbreds should be of outstanding type.
  2. They should not carry any detrimental genes.
  3. Progeney tested animals.
  4. Herd size should be large.

Of the statements given above, which one of the following combinations of factors is most essential? (UPSC Prelims 1990)

[A] 1 and 3
[B] 2 and 3
[C] 1 and 4
[D] 2 and 4

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19. Which one of the following organisms can serve as a biofertiliser for rice crop? (UPSC Prelims 2000)
[A] Blue-green algae
[B] Rhizobium sp
[C] Mycorrhizal fungi
[D] Azotobacter sp

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20. Pollination by which among the following is called as ornithophily?
[A] Rodents
[B] Aquatic animals
[C] Ants
[D] Birds

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