Q.

ABA is a derivative of:

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a

Purines

b

Adenine

c

Terpenes

d

Carotenoids

answer is D.

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Detailed Solution

The plant growth regulators (PGRs) are small, simple molecules of diverse chemical composition. They could be indole compounds (Indole-3-acetic acid, IAA); adenine derivatives (N6-furfurylamino purine, kinetin), derivatives of carotenoids (abscisic acid, ABA); terpenes (gibberellic acid, GA3) or gases (ethylene, C2H4).
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