Question:
Essential micronutrient required for the biosynthesis of auxin is .
Essential micronutrient required for the biosynthesis of auxin is .
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This micronutrient's deficiency causes little leaf disease.
Updated On: Jul 3, 2026
- Calcium
- Magnesium
- Iron
- Zinc
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The Correct Option is D
Solution and Explanation
Step 1: Auxin (IAA) is synthesized in plants from the amino acid tryptophan.
Step 2: Zinc is required for the synthesis of tryptophan, so zinc deficiency lowers auxin levels and produces symptoms like little leaf and rosetting.
Step 3: Calcium, Magnesium and Iron are essential nutrients too, but they are not linked to auxin biosynthesis in this direct way, so the answer is Zinc.
Step 2: Zinc is required for the synthesis of tryptophan, so zinc deficiency lowers auxin levels and produces symptoms like little leaf and rosetting.
Step 3: Calcium, Magnesium and Iron are essential nutrients too, but they are not linked to auxin biosynthesis in this direct way, so the answer is Zinc.
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