Falling of leaves occur as abscission layer is formed when the content of ...........

Auxin increases

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Auxin decreases

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Abscisic acid decreases

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Gibberellic acid decreases

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Solution

The correct option is D Auxin decreases
Abscission is a term used in several areas of biology to mean shedding of various parts of an organism. In plant sciences, it most commonly refers to the process by which a plant drops one or more of its parts, such as leaf, fruit, flower or seed. Auxin inhibits abscission of leaves and fruits. Abscission layer is produced, when the auxin content falls below a minimum.
So, the correct answer is 'Auxin decreases'

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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
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