Which is produced during water stress that brings stomatal closure?

Ethylene

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Abscisic acid

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Ferulic acid

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Coumarin

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Solution

The correct option is B Abscisic acid
Abscisic acid is an antitranspirant and induces seed dormancy. It helps in the closure of stomata which reduces transpiration. It induces seed dormancy so it is also known as dormin. It was first discovered by Adicott in cotton balls. It also reduces the cambial activity and thus protects the plant during stress conditions.
So, the correct answer is option B.

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