NEET 2025 · BiologyPrevious Year Question
Which one of the following phytohormones promotes nutrient mobilization which helps in the delay of leaf senescence in plants?
Answer: (B) Cytokinin. Answer: (B) Cytokinin.
- A.Gibberellin
- B.Cytokinin✓
- C.Ethylene
- D.Abscisic acid
Correct Answer
(B) Cytokinin
Solution & Explanation
Answer: (B) Cytokinin. Solution: Cytokinins promote nutrient mobilisation, which helps delay leaf senescence. Gibberellins delay senescence but via a different route, ethylene actually promotes senescence and abscission, and ABA is a stress hormone/inhibitor—none acts through nutrient mobilisation as described. NCERT: Ch 13, p.177, line ~6: "They promote nutrient mobilisation which helps in the delay of leaf senescence".
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