Chemical Coordination and IntegrationHard

Question

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

Options

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

Solution

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

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