Senescence as an active development cellular process in the growth and functioning of a flowering plant, is indicated in(a) vessels and tracheid differentiation(b) leaf abscission(c) annual plants(d) floral parts
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Vessels and trachied differentiate
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(a)- Vessels and tracheid Differentiation
Explanation:
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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