Assertion :The tadpoles become giant tadpoles when fed on thiourea. Reason: Thiourea is an antithyroid substance.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The thyroid gland secretes thyroxine and triiodothyronine hormone. One of their function is stimulation of tissue differentiation. Because of this action, they promote metamorphosis of tadpoles into adult frogs. Feeding of anti-thyroid substances like thiourea to tadpoles, delays their metamorphosis. As they continue to grow without metamorphosis, they become giant tadpoles.
So, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.

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