NEET 2026
- Exam
- NEET
- Year
- 2026
- Subject
- Zoology
- Chapter
- Human Health and Diseases
NEET 2026 · Zoology · Human Health and Diseases
Which of the following are secondary lymphoid organs ? (a) Bone...
Which of the following are secondary lymphoid organs ?
(a) Bone marrow
(b) Tonsils
(c) Spleen
(d) Thymus
Choose the correct answer from the options given below :
(a) Bone marrow
(b) Tonsils
(c) Spleen
(d) Thymus
Choose the correct answer from the options given below :
Options
- A(a) and (d) only
- B(a) and (b) only
- C(b) and (c) only
- D(b) and (d) only
Correct answer
C. (b) and (c) only
Step-by-step solution
Primary lymphoid organs are the sites where immature lymphocytes differentiate into antigen-sensitive lymphocytes. Examples include bone marrow and thymus.
Secondary lymphoid organs provide the sites for interaction of lymphocytes with the antigen, which then proliferate to become effector cells. Examples include spleen, lymph nodes, tonsils, Peyer's patches of small intestine, and appendix.
Therefore, tonsils and spleen are secondary lymphoid organs, while bone marrow and thymus are primary lymphoid organs."
Secondary lymphoid organs provide the sites for interaction of lymphocytes with the antigen, which then proliferate to become effector cells. Examples include spleen, lymph nodes, tonsils, Peyer's patches of small intestine, and appendix.
Therefore, tonsils and spleen are secondary lymphoid organs, while bone marrow and thymus are primary lymphoid organs."