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NEET 2023, Biology Q4: Plant Growth Regulators

NEET2023Biology
Q.

Which hormone promotes internode/petiole elongation in deep water rice?

  1. A

    GA

  2. B

    Kinetin

  3. C

    Ethylene

  4. D

    2, 4-D

Solution

In deep water rice, submergence triggers rapid internode and petiole elongation so the plant can keep its leaves above the rising water. Ethylene is the gaseous hormone responsible for this escape response; it accumulates in submerged tissues and stimulates the elongation.

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