NTA Abhyas NEET2020BotanyMineral NutritionPractice

Deficiency of zinc, in a plant, shows its effect on the biosynthesis of which plant growth regulator?

Options

AAuxin
BEthylene
CCytokinin
DAbscisic acid

Correct answer

A. Auxin

Step-by-step solution

Zinc functions as activator of enzyme called tryptophan synthetase which is necessary for biosynthesis of auxin from amino acid tryptophan. Thus in deficiency of zinc biosynthesis fails to occur.

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