Question

It is said that in frogs, the hormone thyroxin (produced by the thyroid gland) initiates the process of a tadpoles metamorphosis into an adult frog. In the absence of thyroxin, the tadpole does not transform into an adult and remains in the tadpole stage.

is the absence of thyroxine possible if yes does the tadpole live forever

Answer 1

Yes, it is possible that there is a absence of thyroxine in the body of the tadpole, this will stop the metamorphosis. Tadpole will live for sometime after that it will die.