Metamorphosis in frogs is accelerated by $.....$.

The thyroid gland is composed of $2$ lobes which are located on either side of the $trachea$.

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A):$ During pregnancy,the level of thyroxine is increased in the maternal blood.
Reason $(R):$ Pregnancy is characterised by metabolic changes in the mother.
In the light of the above statements,choose the most appropriate answer from the options given below:

What happens if iodine or thyroxine is added to water containing tadpoles?

The other name for autoimmune thyroiditis is

The primary function of the thyroid gland is to regulate..........