Which substance is responsible for metamorphosis in amphibians?

What is the effect of $Thyroxine$ on the metabolic rate?

The thyroid gland is homologous to which part of lower vertebrates?

Goitre occurs due to....

Which disease in adults is characterized by the following symptoms: $1.$ Low metabolic rate,$2.$ Increase in body weight,$3.$ Water retention in tissues?

Which of the following is $NOT$ a symptom of hypothyroidism in a growing child?