CBSE 2025 · Region 2 · Set 2 · Q16 · 1 mark
Assertion (A) : A patient of ADA-deficiency requires periodic or repeated infusion of genetically-engineered lymphocytes.
Reason (R) : Lymphocytes are not immortal, but have life span.
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).
Biotechnology and its ApplicationsBiotechnological Applications in MedicineUnderstandassertion_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.