Q.

The plant growth regulator that could fit either in plant growth promoters or in plant growth inhibitors is 

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a

Gibberellins

b

Ethylene

c

Abscisic acid

d

Cytokinin

answer is B.

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Detailed Solution

Ethylene shows both growth promoting and growth inhibiting activities almost in equal proportions. Hence it could fit in both growth promoters and growth inhibitors. Gibberellins and Cytokinins are growth promoters and Abscisic acid is growth inhibitor. 

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