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Thyroid Gland

Which of the ...

Question

Which of the following elements is necessary for tadpoles to undergo metamorphosis?

A

Chlorine

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B

Fluorine

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C

Bromine

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D

Iodine

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Solution

The correct option is D
Iodine

In a frog, metamorphosis is controlled by thyroxine, the hormone produced by thyroid. Thyroxine production requires the presence of iodine in water. If the water in which the tadpoles are growing does not contain sufficient iodine, the tadpoles cannot become adults.

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