The plant hormone which triggers the fall of mature leaves and fruits from the plant body is _________.

auxin

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gibberellin

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abscisic acid

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cytokinin

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Solution

The correct option is C abscisic acid
Abscisic acid (ABA) was discovered for its role in regulating abscission and it plays an important role in seed development, maturation and dormancy. It is called abscisic acid because of the formation of the abscission layer which triggers fall of mature leaves and fruits from plants.

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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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