Growth promoting hormone is

2, 4-D

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ABA

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Gibberellin

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IAA

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Solution

The correct option is C Gibberellin
Auxins, cytokinins and gibberellins are the growth-promoting hormones found in plants. Abscisic acid and ethylene are growth-inhibiting hormones found in plants. A 2, 4-D is a weedicide which is used to kill the weeds.
Thus, the correct answer is option C.

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