Which of the following is stress hormone?

A B A

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C_{2} H_{4}

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G A_{7}

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I A A

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Solution

The correct option is A $A B A$
Abscisic acid (ABA) is called stress hormone in plants. During stress conditions, it induces certain responses like closure of stomata during water crisis, promoting seed dormancy etc during unfavourable conditions etc. So, the correct answer is, 'ABA'.

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