Assertion (A) -In Iodine deficient water, tadpoles do not metamorphosize into adult frogs.Reason (R) - Metamorphosis is not controlled by thyroxine.(a) Both A and R are true and R is the correct explanation of A.(b) Both A and R are true but R is not the correct explanation of A.(c) A is true but R is false.(d) A is false but R is true.
Question
Assertion (A) -In Iodine deficient water, tadpoles do not metamorphosize into adult frogs.Reason (R) - Metamorphosis is not controlled by thyroxine.(a) Both A and R are true and R is the correct explanation of A.(b) Both A and R are true but R is not the correct explanation of A.(c) A is true but R is false.(d) A is false but R is true.
Solution
(c) A is true but R is false.
Explanation: Assertion (A) is true because iodine is essential for the production of thyroxine, a hormone produced by the thyroid gland. In tadpoles, thyroxine triggers metamorphosis, the process by which they transform into adult frogs. If iodine is deficient, thyroxine production is affected, and thus, metamorphosis does not occur.
Reason (R) is false because, as explained above, metamorphosis in tadpoles is indeed controlled by the hormone thyroxine. Without sufficient thyroxine, the tadpoles cannot metamorphose into adult frogs.
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