Zinc is essential for — Genetics And Plant Breeding MCQ

Zinc is essential for

Stomatal closing

biosynthesis of 3-IAA

Answer

Oxidation of carbohydrates

None of the above

Answer: Option B

Solution

Answer: Option B

Solution:

Zinc is essential for biosynthesis of 3-IAA in plants.
Zinc activates tryptophan synthetase, which regulates the synthesis of tryptophan, involved in the biosynthesis of indoleacetic acid (IAA).
Indole-3-acetic acid (IAA, 3-IAA) is the most common naturally occurring plant hormone of the auxin class. It is the best-known of the auxins and has been the subject of extensive studies by plant physiologists. IAA is a derivative of indole, containing a carboxymethyl substituent.