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Addition of a trace of thyroxine or iodine in water containing tadpoles will

1. keep them in larval stage
2. hasten their metamorphosis
3. slow down their metamorphosis
4. kill the tadpoles

Correct answer: hasten their metamorphosis

Solution

Thyroxine is the hormone that triggers metamorphosis in tadpoles, and iodine helps the thyroid make more of it. So adding a trace of either one accelerates the transition to the adult form.

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