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Q.

Which plant growth regulator is use for thinning of cotton, cherry and walnut?

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a

Auxin.

b

Gibberellins

c

Cytokinins

d

Ethylene.

answer is D.

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Detailed Solution

Ethephon hastens fruit ripening in tomatoes and apples and accelerates abscission in flowers and fruits (thinning of cotton, cherry, walnut).

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