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Question

___ hormones control the metamorphosis in toad.

A
Estrogen
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B
Thyroxine
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C
Insulin
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D
Adrenalin
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Solution

The correct option is B Thyroxine
Thyroxine is a hormone secreted by the thyroid gland. Iodine is required for the production of thyroxine. If the water in which the tadpoles grow doesn't contain iodine, metamorphosis does not occur.

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