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

Options

A. keep them in larval stagge
B. hasten their metamorphosis
C. slow down their metamorphosis
D. kill the tadpoles

Answer

B

Explanation

Thyroxine controls tissue differentiation and metamorphosis of tadpole larva into frog. Gundernatch (1912) proved that metamorphosis of tadpole into adult frog is controled by thyroxine. Addition of thyroxine in water will hasten the metamorphosis