Which of the following is a growth inhibitor?

IAA

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ABA

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NAA

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_{3}

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Solution

The correct option is B ABA
Abscisic acid (ABA) was discovered for its role in regulating abscission and dormancy. But like other PGRs, it also has other wide-ranging effects on plant growth and development. It acts as a general plant growth inhibitor and an inhibitor of plant metabolism under conditions of stress.
Thus, the correct answer is option B.

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