Multiple choice

Why the presence of iodine is necessary in water in which tadpoles are growing?

  1. Iodine gives nourishment to tadpoles.

  2. Iodine keeps external environment suitable for the growth of tadpoles.

  3. Thyroxin production requires iodine which controls metamorphosis in frogs.

  4. Thyroxin secreted by iodine maintains the concentration of salts in water and helps in the development of tadpoles into frogs.
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C Correct answer
Explanation

Iodine is necessary because production of Thyroxine hormone requires iodine which controls metamorphosis in frogs.

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