Leaves fall from the branches on account of

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(B) The process of leaf fall is known as abscission.At the base of the petiole,a specialized layer of thin-walled parenchymatous cells,called the absc

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Formation of abscission layer external to cork

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(B) The process of leaf fall is known as abscission.At the base of the petiole,a specialized layer of thin-walled parenchymatous cells,called the abscission layer,is formed.Enzymes like cellulase and pectinase dissolve the middle lamella and cell walls in this region,weakening the attachment of the leaf to the stem.Simultaneously,a protective layer of suberized,thick-walled cork cells is formed on the stem side (proximal to the abscission layer) to prevent water loss and pathogen infection after the leaf falls.

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