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Account for the following briefly : H...

Account for the following briefly :
Herbaceous plants growing in well watered soils are found to wilt on a hot day.

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Herbaceous plants growing in well watered soils are found to wilt on a hot day. It is due to the fact that in such cases the rate of transpiration during day-time exceeds the rate of absorption of water by the roots. The cells therefore lose turgidity. In the evening or during night, the stomata are constricted and the temperature is not high, therefore there is no loss of water through transpiration and the turgidity of the leaves is reacquired and they stand out erect.
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