helps in the synthesis of the growth hormone auxin.

Iron

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Manganese

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Zinc

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Solution

The correct option is C Zinc
Micronutrients help in different functions of the plant. Zinc helps in the synthesis of auxin and is a constituent of other plant hormones. The deficiency of zinc results in stunted growth and yellowing of leaves. Iron and manganese involved in chlorophyll synthesis.

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Question 13
Iodine is necessary for the synthesis of which hormone?

(a) Adrenaline
(b) Thyroxine
(c) Auxin
(d) Insulin

Name the following :

(a) Hormone that stimulates growth by cell-division.

(b) Growth retarding hormone in plants.

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