Stomata of CAM plants

(a) open during the night and close during the day Correct
(b) never open Your answer
(c) open during the day and close at night Your answer
(d) are always open Your answer

Your answer: Correct answer: (a)

Explanation

Why (a) is correct

CAM plants keep their stomata closed during the hot day and open them at night. CO₂ taken in at night is stored as organic acids and used in the day, so water loss is reduced.

Why the other options are wrong

(b) · your answer Stomata must open at some time to let in CO₂.
(c) · your answer This is the usual pattern of most plants, the opposite of CAM.
(d) · your answer Stomata that stayed open all the time would waste water, which CAM plants avoid.

NCERT point: Stomata are the openings through which CO₂ enters the leaf; when they close, CO₂ uptake falls.

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Stomata of CAM plants

Explanation

Why (a) is correct

Why the other options are wrong

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