Internodal elongation in sugarcane stem is promoted by:

$G A_{3}$

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Solution

The correct option is A $G A_{3}$
Gibberellic acid (GA) is a naturally occurring hormone or growth-regulating chemical that is found to varying degrees in all parts of plants. Gibberellins (GAs) regulates various developmental processes, including stem elongation. Gibberellic acid ( $G A_{3}$ ) is used in internodal elongation in sugarcane stem.

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