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Biology · 2026 · 2 marks
CBSE 2026 · Region 5 · Set 3 · Q17
State the role of thymus as a lymphoid organ. Name the cells that are released from it and mention their functions.
State the role of thymus as a lymphoid organ. Name the cells that are released from it and mention their functions.
Marking-scheme solution
Immature lymphocytes differentiate into antigen sensitive T-lymphocytes.
• T-lymphocytes / T-cells
− They help B-cells to secrete antibodies
− They involved in cell mediated immunity / CMI
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CBSE Class 12 Biology past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.