Leaf ageing is retarded by
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Explanation:
Furthermore, leaf senescence can beretarded locally by the application of cytokinins, hormones that stimulate plant cell division. Parallel effects have been demonstrated with growth substances of the auxin type in other plant systems.
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Answer: cytokinins
Explanation: External application of cytokinins delays the rate of chlorophyll disappearance and protein degradation which usually accompanies the process of senescence in leaves.
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