NEET 2025 · BiologyPrevious Year Question
After maturation, in primary lymphoid organs, the lymphocytes migrate for interaction with antigens to secondary lymphoid organ(s)/tissue(s) like: A. thymus B. bone marrow C. spleen D. lymph nodes E. Peyer’s patches Choose the correct answer from the options given below:
Answer: (B) C, D, E only. Answer: (B) C, D, E only.
- A.E, A, B only
- B.C, D, E only✓
- C.B, C, D only
- D.A, B, C only
Correct Answer
(B) C, D, E only
Solution & Explanation
Answer: (B) C, D, E only. Solution: After maturing in the primary lymphoid organs, lymphocytes migrate to the secondary lymphoid organs, which include spleen (C), lymph nodes (D), tonsils, Peyer's patches of small intestine (E) and appendix. These are the sites where lymphocytes interact with antigens. Why not the others: Thymus (A) and bone marrow (B) are PRIMARY lymphoid organs (sites of origin/maturation), not secondary ones, so any option containing A or B is wrong. Hence C, D, E only. NCERT Reference: NCERT Ch7, p.138, lines 3-7: "secondary lymphoid organs like spleen,"
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