Class 12 · Human Health and Diseases

Secondary Lymphoid Organs and Immunity — NEET Biology

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📖 NCERT Source

After maturation the lymphocytes migrate to secondary lymphoid organs like spleen, lymph nodes, tonsils, Peyer's patches of small intestine and appendix. The secondary lymphoid organs provide the sites for interaction of lymphocytes with the antigen, which then proliferate to become effector cells. The location of various lymphoid organs in the human body

NCERT Biology · Class 12 · Chapter 7 · Paragraph 46
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QuestionPractice Question

Which of the following is a secondary lymphoid organ?

📖 Solution & NCERT Explanation
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Correct answer: A A Spleen

Spleen is a secondary organ where lymphocytes encounter antigens.

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What does NCERT say about After maturation lymphocytes migrate?
After maturation the lymphocytes migrate to secondary lymphoid organs like spleen, lymph nodes, tonsils, Peyer's patches of small intestine and appendix. The secondary lymphoid organs provide the sites for interaction of lymphocytes with the antigen, which then proliferate to become effector cells.
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Human Health and Diseases, Class 12 NCERT Biology.

Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.

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