Falling of floral parts, leaves ad fruits from the mother plant is called

Senescence

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Abscission

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Photoperiodism

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Vernalisation

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Solution

The correct option is B Abscission
Falling of floral parts, leaves and fruits from the mother plant are called abscission. On ageing, there is the reduction of chlorophyll in the leaf due to a reduction in photosynthesis. This induces the abscission of leaves. Abscisic acid induces abscission process.
Thus, the correct answer is option B.

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Question 20
The substance that triggers the fall of mature leaves and fruits from plants is

(a) auxin
(b) gibberellin
(c) abscisic acid
(d) cytokinin

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