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Question

Stomata are bound by a pair of guard cells. Stomata close, when the guard cells become

A
Turgid
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B
Flaccid
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C
Half turgid
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D
Half flaccid
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E
Small
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Solution

The correct option is A Flaccid
Opening and closing of stomata are controlled by the turgor changes in the guard cells. In the dark, the guard cells lose water, become flaccid and the stomata close. In the light, the guard cells absorb water by osmosis, become turgid and the stomata open.

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