write notes on abscissic acid
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Answer:
Abscissic acid(ABA).
Explanation:
ABA functions in many plants developmental processes including seed and bud dormancy,the control of organ siza and stomatal closure.
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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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