Question

Tadpoles will undergo metamorphosis if they are

• A. Fed on Frog eggs
• B. Provided with suitable environment
• C. Injected with thyroxine
• D. Injected with gonadotropic hormones

Answer 1

The correct option is C Injected with thyroxine

In frogs, growth and metamorphosis (development of frog from tadpole stage to adult stage) is regulated by thyroxine gland. Thyroxine is secreted from thyroid gland. It stimulates the consumption of oxygen by metabolically active tissues and also increases the oxidation of glucose in tissues. Hence, tadpoles will undergo metamorphosis if they are injected with thyroxine.

So, the correct answer is 'Injected with thyroxine'.