Tadpoles growing in ___________ water shows retarded growth.
A
Iodine deficient
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B
Iodine rich
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C
Magnesium deficient
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D
Magnesium rich
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Solution
The correct option is A Iodine deficient The process of growth and development is regulated by thyroxine hormone which is produced by thyroid gland. Iodine is required for thyroxine production. That is why retarded growth is seen in tadpoles living in iodine deficient water.