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Answer: (b) Abscissic acid

Abscisic acid (ABA) is the main growth inhibitor in plants. It induces dormancy of buds and seeds, promotes abscission and closes stomata under water stress, which is why it is called the stress hormone. Auxins, gibberellins and cytokinins are growth promoters.

Doubtly AI · 29 Oct 2026 AI-verified · Nov 2026 Report
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