A) boron
B) magnesium
C) zinc
D) None of these
Correct Answer: C
Solution :
Zinc is essential for the synthesis of tryptophan, which is precursor of IAA. It helps in metabolism as an activator of several enzymes. Deficiency of zinc causes mottled leaves, decrease auxin content and little leaf disease, white bud of maize and sickle leaf of coca.
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