How is metamorphosis in frog tadpole delayed or improper if iodine is insufficient?

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Solution

Metamorphosis in tadpole larva requires hormone thyroxine which is secreted by an endocrine gland named thyroid. The formation of thyroxine needs iodine as a raw material. Hence in the absence of iodine, the thyroxine hormone formed is very less, as a result, the metamorphosis of tadpole into frog is either delayed or is improper.

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Name the hormone which is required for the metamorphosis of larvae (tadpoles) into adult frogs.

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