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Read the assertion and reason carefully ...

Read the assertion and reason carefully to mark the correct option out of the option given below
Assertion: The tadpoles become giant tadpoles when fed on thiourea.
Reason: Thiourea is an antithyroid substance.

A

If both the assertion and the reason are true and the reason is a correct explanation of the assertion

B

If both the assertion and reason are true but the reason is not a correct explanation of the assertion

C

If the assertion is true but the reason is false

D

If both the assertion and reason are false

Text Solution

Verified by Experts

The correct Answer is:
A
The thyroid gland secretes thyroxin and triiodothyronine hormone one of their function is stimulation of tissue differentiation. Because of this action they promote metamorphosis of tadpoles into adult frogs. Feeling of anti – thyroid substances like thiourea to tadpoles delay their metamorphosis. As they continue to grow without metamorphosis, they become giant tadpoles.
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