Which one of the following is a naturally occurring growth inhibitor?

IAA

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ABA

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NAA

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Solution

The correct option is B ABA
Abscisic acid is a plant hormone. This hormone is synthesized in leaves and then translocated to stem apices through the phloem. It is involved in leaf abscision. It is responsible for seed dormancy as it inhibits seed germination. Hence it is a powerful growth inhibitor. It also inhibits growth stimulated by gibberellin. Thus the correct answer is option B.

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