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Question

Internodal elongation is promoted by the action of

A
Auxin
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B
Gibberellic acid
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C
Cytokinin
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D
Abscisic acid
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Solution

The correct option is B Gibberellic acid
Gibberellic acid is a plant hormone which is involved in various developmental processes like stem elongation, germination, dormancy, leaf and fruit senescence, etc. It helps in process of bolting. Bolting is a rapid stem elongation of plant. It also promotes elongation of the internodes in such a way that dwarf plants overcome the genetic dwarfism.
Thus, the correct answer is option B.

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