Question

After the rain, tadpoles were found swimming in a pond but not the frogs. This is due to:

• A. Lack of pituitary hormones
• B. Lack of sex hormones
• C. Lack of thyroxine
• D. Lack of nitrogen in water

Answer 1

The correct option is C Lack of thyroxine

Tadpole is one of the developmental stages in the life cycle of frogs. The larvae are free-swimming forms which are found in the water. The larvae get metamorphosed to form the adult frog. The thyroid hormones are required for the control and regulation of the events which take place during metamorphosis.

Thus, the correct answer is option C.