Leaf fall occurs when

Auxin content is more in lamina than in the stem

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Auxin content is low in the lamina as compared to stem

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Abscisic acid is formed

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Morphactins are produced

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Solution

The correct option is B Auxin content is low in the lamina as compared to stem
Leaf abscission is a detachment or fall of older leaves.It occurs at the base of the petiole. It is observed that the intact leaf does not fall off because base of petiole of young leaf synthesizes auxin. During leaf abscission, auxin content is low in the lamina as compared to stem. Also, ethylene content is high in the lamina during abscission.
Thus, the correct answer is option B.

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