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NEET 2025, Biology Q89: Plant Growth Regulators

NEET2025Biology
Q.

Which one of the following phytohormones promotes nutrient mobilization which helps in the delay of leaf senescence in plants?

  1. A

    Cytokinin

  2. B

    Ethylene

  3. C

    Abscisic acid

  4. D

    Gibberellin

Solution

Cytokinins promote nutrient mobilisation toward leaves, which delays leaf senescence (the “Richmond-Lang effect”). They also help overcome apical dominance.

Ethylene and abscisic acid, in contrast, accelerate senescence and abscission.

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