Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Pregnancy is characterised by metabolic changes in the mother. Reason (R): During pregnancy, the level of thyroxine is increased in the maternal blood. In the light of the above statements, choose the most appropriate answer from the options given below:
Both (A) and (R) are True and (R) is the correct explanation of (A).
Both (A) and (R) are True but (R) is not the correct explanation of (A).
(A) is True but (R) is False.
(A) is False but (R) is True.
According to the text, during pregnancy, the levels of several hormones, including thyroxine, are increased several-folds in the maternal blood. It explicitly states that the 'increased production of these hormones is essential for supporting the fetal growth, metabolic changes in the mother and maintenance of pregnancy'. Since thyroxine is a key regulator of metabolism (Basal Metabolic Rate), its increased level explains the metabolic changes observed in the mother.
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