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Biology · 2025 · 1 mark
CBSE 2025 · Region 5 · Set 2 · Q16
Assertion (A): Lymphocytes arise from bone marrow and present in the blood and lymph and serve as natural killer cells. Reason (R): Lymphocytes…
Assertion (A): Lymphocytes arise from bone marrow and present in the blood and lymph and serve as natural killer cells. Reason $\displaystyle (R)$ : Lymphocytes migrate to thymus, where they develop into T-cells and begin to mature.
Official answer
(A)
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
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CBSE Class 12 Biology past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.