AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
Answer: (D) A is false but R is true.
The assertion is false — insulin secretion increases (not decreases) when blood sugar rises. The reason is true: hormone secretion is regulated by a feedback mechanism.
The feedback mechanism (R) is correct as stated in Chapter 6. However, the assertion (A) is incorrect — when blood sugar falls, the pancreas reduces insulin secretion (and glucagon may increase), but the phrasing implies a simple decrease is the response to falling sugar, which misrepresents the stimulus-response relationship. The key error is in A, while R stands as a true, general principle. Examiners expect you to evaluate both statements independently before judging the relationship.