CBSE 2025 · Region 2 · Set 2 · Q15 · 1 mark
Assertion (A) : Secondary immune response is quicker and stronger than the primary immune response.
Reason (R) : Our body appears to have the memory of the first encounter therefore response to the subsequent encounter with the same pathogen is quick.
Official answer
From CBSE’s own marking scheme for this paper.
(A)
Both (A) and (R) are true and (R) is the correct explanation of (A).
Human Health and DiseaseImmunityUnderstandassertion_reasonmedium
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CBSE Class 12 Biology past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.