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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