Which of the following glands plays a key role in the metamorphosis of a frog's tadpole?

Which of the following is not a genetic disease?

Read the given statements $:$
$(A)$ Hypothyroidism during pregnancy causes defective development and maturation of the growing baby.
$(B)$ Thyroxine does not require a secondary messenger.
$(C)$ Thyroxine plays a major role in the regulation of Basal Metabolic Rate $(BMR)$.
$(D)$ Hypersecretion of thyroxine could cause immunodeficiency.
How many of the above statements are correct?

Which of the following is the largest endocrine gland?

Which of the following endocrine glands stores its secretion in the extracellular space before releasing it into the blood?

Metamorphosis in amphibians can be accelerated by