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Zoology · Human Health and Diseases

NEET (UG) 2025 — Question 147

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:

  1. Option A:

    B, C, D only

  2. Option B:

    A, B, C only

  3. Option C:

    E, A, B only

  4. Option D:

    C, D, E only

    Correct

Answer: D

Step-by-step solution

Primary lymphoid organs are thymus and bone marrow, where lymphocytes mature. After maturation, lymphocytes migrate to secondary lymphoid organs/tissues where they interact with antigens. Secondary lymphoid organs include the spleen and lymph nodes. Peyer's patches are secondary lymphoid tissues present in the small intestine. Among the listed options, the secondary lymphoid organs/tissues are spleen (C), lymph nodes (D), and Peyer's patches (E). Thymus (A) and bone marrow (B) are primary lymphoid organs, not secondary. Therefore, the correct option is D.

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Exam
NEET (UG) 2025
Paper
2025 paper
Subject
Zoology
Chapter
Human Health and Diseases
Topic
Immunity - LYMPHOID ORGANS

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