NEET Biology question

Addition of a trace of thyroxine or iodine in water containing tadpoles will [AIPMT 1990]

(A)Keep them in the larval stage
(B)Hasten their metamorphosisCorrect
(C)Slow down their metamorphosis
(D)Kill the tadpoles

Answer: (B)

Solution

Thyroxine/iodine does not arrest tadpoles in the larval stage, slow their development, or act as a toxin at this trace level. Since thyroxine (requiring iodine

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Question ID VK-129054