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प्रश्न
Which is a stress hormone?
पर्याय
Benzyl aminopurine
DAA
Ethylene
Abscisic acid
MCQ
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उत्तर
Abscisic acid
Explanation:
Abscisic acid (ABA) is known as the plant stress hormone because its synthesis is rapidly triggered by adverse environmental conditions like drought, high salinity, and extreme temperatures. It helps the plant survive these conditions by stimulating the immediate closure of stomata to prevent excessive water loss through transpiration. Additionally, it promotes seed and bud dormancy, allowing the plant to suspend growth and withstand harsh conditions until favourable environments return.
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