Biology : PU-CET (U.G) 2018 Panjab University Entrance Exam With Answers

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20.

Which Plant Growth Regulator Prevent Fruit Drop At Early Stages But Promote It At Maturity ?

A: Auxins

B: Gibberellins

C: Cytokinins

D: Abscisic Acid

The answer is: A

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Explanation

The plant growth regulator that can prevent fruit drop at early stages but promote it at maturity is Auxin.

Auxin (Indole-3-acetic acid or IAA) can prevent fruit and leaf drop at early stages and also promote abscission of mature and older leaves