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Question

The stomatal aperture which is surrounded by guard cells opens when these cells are ___


A

Flaccid

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B

Tugid

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C

Turned inward

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D

Pushed outward

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Solution

The correct options are
B

Tugid


D

Pushed outward


In the presence of sunlight, the guard cells take up water by osmosis and turn turgid. Due to this effect, their inner walls become rigid and they are pulled apart. This results in opening of stomata. This also explains why the transpiration rate is increased by an increase in light intensity.


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