Which one is not a growth promoter?

ABA

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IAA

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Solution

The correct option is A ABA
There are various plant hormones which act as growth regulators. Hormones like gibberellic acid (GA), Indoleacetic acid (IAA), a type of auxin, cytokinin (CK) are growth promoter. Hormones like Abscisic Acid (ABA), ethylene are growth inhibitor. These hormones accelerate abscission process.
Thus, the correct answer is option A.

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