Q1. Which gas is released as a by-product of photosynthesis?
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Answer: D. Oxygen
Photosynthesis releases oxygen, which comes from the splitting of water.
Biology - Plant Physiology Questions for SSC CGL (with Answers)
9 Biology - Plant Physiology MCQs from the General Awareness section, with answers and short explanations.
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Q2. What are the raw materials for photosynthesis?
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Answer: C. Carbon dioxide and water
Plants use carbon dioxide and water, in the presence of sunlight and chlorophyll, to make glucose.
Q3. The bending of a plant shoot towards light is called:
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Answer: D. Phototropism
Phototropism is the growth movement of a plant part in response to light.
Q4. Tiny pores on the surface of leaves through which gases are exchanged are called:
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Answer: B. Stomata
Stomata are small pores on leaves, guarded by guard cells, for gas exchange and transpiration.
Q5. Which gaseous plant hormone promotes ripening of fruits?
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Answer: A. Ethylene
Ethylene is a gaseous plant hormone that hastens fruit ripening.
Q6. The loss of water in the form of vapour from the aerial parts of a plant is called:
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Answer: A. Transpiration
Transpiration is the loss of water vapour, mainly through stomata of leaves.
Q7. Roots growing downwards in response to gravity show:
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Answer: C. Positive geotropism
Roots grow towards gravity, which is positive geotropism.
Q8. Which plant hormone inhibits growth and causes closing of stomata during water stress?
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Answer: D. Abscisic acid
Abscisic acid inhibits growth and triggers stomatal closure under stress, e.g., wilting.
Q9. Which plant hormone promotes cell elongation and causes the shoot to bend towards light?
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Answer: C. Auxin
Auxin collects on the shaded side of the shoot, making those cells elongate so the shoot bends towards light.
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