In the extreme drought condition, which of the following plant hormone is produced, due to which stomata closes?

ABA

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IAA

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Gibberellin

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Ascorbic acid

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Solution

The correct option is A ABA
ABA is a plant hormone which is inhibiting in nature. It causes the closure of stomata, in order to reduce the rate of transpiration and the loss of water thereby. It is also well known for its dormant activity. ABA promotes early aging in the plant and also inhibits flowering, fruiting, germination, etc.
Thus, the correct answer is option A.

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