BotanyNEET 2025Plant growth regulators: auxin, gibberellin, cytokinin, ethylene, ABA

Plant Growth and Development

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

A.Ethylene
B.Abscisic acid
C.Gibberellin
D.Cytokinin✓

Solution

Cytokinins promote nutrient mobilisation and so delay leaf senescence; ethylene and abscisic acid promote senescence.

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