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Answer: 4. Ethylene

Key idea: In deep water rice, submergence raises ethylene levels, and ethylene promotes rapid elongation of internodes and petioles, so the leaves and upper stem stay above water.

Kinetin promotes cell division, and 2,4-D is a synthetic auxin used as a weedicide. Gibberellin does cause stem elongation in general, but the NCERT-based answer for deep water rice is ethylene.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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