Question

A scientist forgot to add iodine to the water in which he was rearing tadpoles. What will happen to the tadpoles and why?

Answer 1

Iodine is required for the synthesis of the thyroid hormone thyroxine. This thyroxine in amphibians like frogs, help in the metamorphosis of tadpoles to become a frog.

So, due to the absence of iodine no metamorphosis of the tadpoles would take place.