Plants deficient of element zinc, show its effect on the biosynthesis of plant growth hormone :
Correct answer: A. Auxin
- A. Auxin
- B. Cytokinin
- C. Ethylene
- D. Abscisic Acid
Explanation
a) : Zinc is available to the plants for absorption in the divalent form. It occurs in the form of minerals as hornblende, magnetite, biotite etc., from where it is released by weathering. It is involved in the synthesis of Indoleacetic acid in plants. It is an activator in the enzyme tryptophan synthetase. Tryptophan is the precursor of Indoleacetic acid.
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