Growth promoter hormones are

IAA, ABA and CK

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IAA, GA and ABA

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IAA, GA and CK

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ABA, CK and GA

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Solution

The correct option is C IAA, GA and CK
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 C.

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