Addition of a trace of thyroxine or iodine in water containing tadpoles will

Options

A. injecting thyroxine hormone
B. feeding the eggs of other frogs
C. injecting gonadotrophic hormones
D. providing them with suitable climatic conditions

Answer

A

Explanation

Tadpoles can be made to grow in size by injecting thyroxine hormone. The process by which tadpole grows in size and become adult is known as metamorphosis. The amphibian metamorphosis is under neuroendoerine control.