Science
A stomata closes when :
(a) it needs carbon dioxide for photosynthesis.
(b) it does not need carbon dioxide for photosynthesis.
(c) water flows out of the guard cells.
(d) water flows into the guard cells.
The correct reason(s) in this process is/are:
options
- (a) only
- (a) and (c)
- (b) and (c)
- (b) and (d)
Photosynthesis
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Answer
(b) and (c)
Reason — Stomata are tiny pores on the surface of leaves that control the exchange of gases and water.
When a plant does not need carbon dioxide for photosynthesis or wants to prevent water loss, the guard cells lose water and become flaccid, causing the stomata to close.
So, stomata close when:
- it does not need carbon dioxide for photosynthesis, and
- water flows out of the guard cells.
Hence, correct reasons are (b) and (c).
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