Plants deficient of zinc show reduced biosynthesis of growth hormone

Cytokinin

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Auxin

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Abscisic acid

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Ethylene

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Solution

The correct option is A Auxin
Auxin is a growth hormone which is synthesized by tryptophan as a precursor by tryptophan-dependent auxin biosynthesis pathway. Zinc helps in the biosynthesis of auxin and its oxidative attack by free radical. It suppresses the production of oxygen during the synthesis of auxin and also acts as a coenzyme and activates the enzyme for auxin formation.
So, the correct answer is option B.

Suggest Corrections

	Column-I		Column-II
(a)	Iron	(i)	Photolysis of water
(b)	Zinc	(ii)	Pollen germination
(c)	Boron	(iii)	Required for chlorophyll biosynthesis
(d)	Manganese	(iv)	IAA biosynthesis