Which of the following is capable of delaying yellowing of leaves?

Gibberellins

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Cytokinins

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ABA

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Auxins

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Solution

The correct option is B Cytokinins
Cytokinin is a plant hormone which prevents the degeneration of chlorophyll and protein and thus causes the delay in ageing of the plant. It thus helps in reducing the leaf fall. This is called as 'Richmond Lang effect' by cytokinin.

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