ReNEET 2026 · Biology · Q165Body Fluids and Circulation / Immune SystemIn our bank: Strong match · 86%
Which of the following are secondary lymphoid organs? (a) Bone marrow, (b) Tonsils, (c) Spleen, (d) Thymus.
- A.(a) and (b) only
- B.(b) and (c) only✓
- C.(a) and (d) only
- D.(c) and (d) only
Correct Answer
(B) (b) and (c) only
Solution & Explanation
Primary lymphoid organs (where lymphocytes mature) are the bone marrow and thymus. Secondary lymphoid organs (where mature lymphocytes interact with antigens) include the spleen, lymph nodes, tonsils, Peyer's patches and MALT. So tonsils (b) and spleen (c) are secondary.
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