Question

why do tadpoles growing in iodine deficient water fail to grow into frogs​

Answer 1

Explanation:

The growth and development of the animals like tadpole is controlled by the hormone called thyroxine produced by the thyroid gland. ... Thus, if the water in which tadpole is living is deficient in iodine, it retards its growth and metamorphosis. Thus, it fails to develop into adult frog.

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Answer 2

Because for the transformation of a tadpole into an adult frog is done by a hormone which requires iodine to activate it. So the tadpoles which grow in iodine deficient waters will not transform into an adult frog.