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Characteristics of Auxin

Pruning of pl...

Question

Pruning of plants promotes branching due to sensitisation of axillary buds by

A

IAA

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B

Ethylene

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C

Gibberellin

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D

Cytokinin

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Solution

The correct option is A IAA
Pruning is the method of selectively removing plant parts like branches, buds, leaves, roots. When apical bud is removed, it results in branching due to sensitisation of axillary buds by IAA, a type of auxin. Pruning of any part of plant will give lower axillary buds a chance to pour their auxin into the stem. This makes plant bushy.
Thus, the correct answer is 'IAA'.

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Q. The shoot branching depends upon the development of axillary buds, but many of the buds in axillary position never grow out due to the _____________________.

Q. Assertion :Auxin promote apical dominance by suppressing the activity of lateral buds. Reason: In moriculture periodic pruning of shoot tips is done to make mulberry plants bushy.

A : Auxins promote apical dominance by suppressing the lateral growth of axillary buds.

R : Periodic pruning of shoots in mulberry helps in making the shoots bushy.

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