Leaves fall off from branches in winter due to [CPMT 1977, 84]
A) Formation of abscission layer
B) Shortening of day length
C) Fall in temperature
D) All the above
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A) Formation of abscission layer
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Answer:
A) Formation of abscission layer
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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