The role of auxin is to(1) Cause abscission of leaves and fruits
(2) Prevent abscission of leaves and fruits(3) Promote stomatal closure
(4) Promote dormancy
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prevents abscission of leaves and fruits
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Structural. In deciduous trees, an abscission zone, also called a separation zone, is formed at the base of the petiole. It is composed of a top layer that has cells with weak walls, and a bottom layer that expands in the autumn, breaking the weak walls of the cells in the top layer. This allows the leaf to be shed.
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