AIIMS 2018 Zoology Biochemical Reactions Assertion Reason Question

Option B is correct because the assertion accurately defines metabolism as the sum of all chemical reactions in living organisms, which includes catabolic and anabolic processes. However, the reason provided, stating that metabolic reactions occur simultaneously, does not directly explain the assertion, as it does not encompass the entirety of metabolic processes, which can also occur sequentially. Option A is incorrect because, while both statements are true, the reason does not explain the assertion. Option C is incorrect since the assertion is true, and the reason is also true. Option D is incorrect because both statements are indeed true.