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Question

In CAM plants, CO2 required for photosynthesis enters the plant body during

A
Daytime when the stomata are open.
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B
Night when the hydathodes are open.
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C
Daytime through the lenticels.
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D
Nights through the stomata which are kept open.
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Solution

The correct option is D Nights through the stomata which are kept open.
CAM plants are those plants whose stomata open at night so that they can fix carbon-dioxide in the form of organic acids because these plants are adapted to grow in arid conditions. They accumulate carbon dioxide at night in vacuoles whereas in day time malic acid in transported to chloroplasts where it is again converted into carbon dioxide for photosynthesis.
Thus, the correct answer is option D.

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