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प्रश्न
The growth regulator that retards ageing of plant organ is ______.
विकल्प
Auxin
Gibberellin
Cytokinin
Abscisic acid
MCQ
रिक्त स्थान भरें
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उत्तर
The growth regulator that retards ageing of plant organ is cytokinin.
Explanation:
Cytokinins delay the ageing or senescence of plant organs (especially leaves) through a phenomenon known as the Richmond-Lang effect. They achieve this by promoting nutrient mobilisation, preventing chlorophyll degradation, and maintaining protein synthesis within the cells. This preservation of vital cellular components keeps the plant tissues metabolically active and green for a much longer period, whereas abscisic acid acts as an inhibitor that accelerates ageing.
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