Question

tadpoles growing in iodine deficient water have retread growth give reason

Answer 1

The hormone thyroxine, produced by the thyroid gland of the frog, is essential to carry out the process of metamorphosis. Iodine is needed for the production of thyroxine; it is made available by the water in which the tadpoles are growing. Thus, tadpoles growing in iodine deficient water have retreat growth.