Biology MCQs

11. Which of the following is the reason behind bleeding through nose in high mountain regions? (UPSC Prelims 1979).
[A] The pressure of the blood capillaries is higher than the outside pressure
[B] The pressure at high altitudes is greater than that in the plains
[C] The blood pressure increases at high altitudes
[D] The blood pressure decreases at high altitudes

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12. Which one of the following is not an essential micronutrient for plants? (UPSC Prelims 1996)
[A] Boron
[B] Zinc
[C] Sodium
[D] Copper

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13. Which of the following concepts was explained by Stephen Hales?
[A] new species are formed from the sudden and unexpected emergence of alterations in their defining traits.
[B] plant function and behaviour
[C] principles of genetics and inheritance to the improvement of the human race
[D] None of these

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14. What is the process in which material is ingested by the cells through the plasma membrane?
[A] Egestion
[B] Diffusion
[C] Osmosis
[D] Endocytosis

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15. Which of the following compounds is not found in protein?
[A] Carbon
[B] Hydrogen
[C] Sulfur
[D] Helium

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16. Which of the following plant group requires both land and water to complete its life cycle?
[A] Tracheophyta
[B] Pteridophyta
[C] Thallophyta
[D] Bryophyta

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17. Chemotaxis is a phenomenon of__?
[A] swimming away of bacteria
[B] swimming towards a bacteria
[C] swimming away or towards of bacteria in presence of chemical compound
[D] All of the above

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18. The redwood tree is__?
[A] Cedrus
[B] Pinus
[C] Dalbergia
[D] Sequoia

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19. Which of the following performs an important function of flowers?
[A] They help in the process of reproduction
[B] They produce diaspores without fertilization
[C] The gametophytes develop inside the flower
[D] All of the above

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20. Name the plant tissue which helps in the transport of food.
[A] Xylem
[B] Aerenchyma
[C] Phloem
[D] Chlorenchyma

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