Question

A stomata closes when: (i) It needs carbon dioxide for photosynthesis. (ii) It does not need carbon dioxide for photosynthesis. (iii) water flows out of the guard cells. (iv) water flows into the guard cells. The correct reason(s) in this process is/are: (a) (i) only (b) (i) and (iii) (c) (ii) and (iii) (d) (ii) and (iv) (1 Mark) (2024)

June 19, 2025

Answer

Correct Answer: (c) (ii) and (iii)

Explanation:

(ii) Stomata closes when the plant does not need CO₂ for photosynthesis – True. No need to lose water if CO₂ is not needed.
(iii) Water flows out of guard cells – True. Loss of water makes guard cells flaccid, causing stomatal closure.

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