If a trace of thyroid extract is added to water containing tadpoles, it will

Slow down the metamorphosis

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Hasten the metamorphosis

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Keep them as tadpoles

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Kill the tadpoles

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Solution

The correct option is B Hasten the metamorphosis
Iodine serves as limiting factor in metamorphosis and removal of animal’s thyroid gland make halts the metamorphosis forever as thyroid hormones are rich in iodine. This makes option C incorrect. Thus, injection of thyroid extracts in tadpoles hastens the metamorphosis because of being rich in iodine content. This makes options A and D incorrect and option B correct.

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If thyroid extract is added to the water containing tadpole, it will

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