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Which one of the following growth regulators is known as ‘stress hormone’?

1. Abscissic acid
2. Ethylene
3. GA₃
4. Indole acetic acid

Correct answer: Abscissic acid

Solution

Abscisic acid (ABA) is called the stress hormone because it accumulates when plants face drought, salinity, or cold stress. It helps the plant survive by reducing water loss and inducing protective responses.

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