At what time, the stomatal transpiration is completely stopped

Morning

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Night

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Evening

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None of the above

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Solution

The correct option is B Night
Transpiration is regulated by movement of guard cell. At night, when there is no light the amount of solute decreases in guard cell which leads to fall in its osmotic potential. The guard cell loses water and turns flaccid and the stomata closes, so the transpiration stops.
So, the correct answer is option B.

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