Q.38 Match the cell type (Column I) with its function (Column II).
Column I                                     Column II
P. B cells                                    1. Humoral immunity
Q. Neutrophils                         2. Cytotoxicity
R. T cells                                   3. Histamine-associated allergy
S. Mast cells                            4. Phagocytosis
(A) P-1, Q-2, R-3, S-4
(B) P-1, Q-4, R-2, S-3
(C) P-4, Q-3, R-1, S-2
(D) P-4, Q-3, R-2, S-1

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Understanding the MCQ: Cell Types and Immune Functions

In immunology, matching cell types to their primary functions tests core knowledge of adaptive and innate immunity. This question from exams like NEET or university biology assessments asks you to pair:

• Column I (Cell Types): P. B cells, Q. Neutrophils, R. T cells, S. Mast cells

• Column II (Functions): 1. Humoral immunity, 2. Cytotoxicity, 3. Histamine-associated allergy, 4. Phagocytosis

Options are:
(A) P-1, Q-2, R-3, S-4
(B) P-1, Q-4, R-2, S-3
(C) P-4, Q-3, R-1, S-2
(D) P-4, Q-3, R-2, S-1

Let’s break it down step-by-step.

Correct Answer: Option (B) P-1, Q-4, R-2, S-3

Why is (B) correct? Each pairing aligns with established immune roles:

• P. B cells → 1. Humoral immunity: B cells (B lymphocytes) mature in bone marrow and produce antibodies. They drive humoral immunity via plasma cells secreting immunoglobulins (IgM, IgG, etc.) against extracellular pathogens.

• Q. Neutrophils → 4. Phagocytosis: These granulocytes (60-70% of leukocytes) are first responders in innate immunity. They engulf and destroy bacteria via phagocytosis, releasing antimicrobial granules.

• R. T cells → 2. Cytotoxicity: Cytotoxic T cells (CD8+) recognize infected or cancerous cells via MHC class I and induce apoptosis through perforin and granzymes—key for cell-mediated cytotoxicity.

• S. Mast cells → 3. Histamine-associated allergy: Found in tissues, mast cells degranulate during allergies or parasites, releasing histamine, leading to inflammation, vasodilation, and symptoms like itching or anaphylaxis.

This matching reflects standard textbook definitions (e.g., Abbas’ Cellular and Molecular Immunology).

Why Other Options Are Incorrect

Examine each wrong choice to solidify understanding:

• Option (A) P-1, Q-2, R-3, S-4
  Correct: P-1 (B cells-humoral). Wrong: Q-2 (neutrophils aren’t primarily cytotoxic; that’s NK/T cells), R-3 (T cells don’t trigger histamine allergies), S-4 (mast cells release mediators, not phagocytose like macrophages/neutrophils).

• Option (C) P-4, Q-3, R-1, S-2
  All mismatched: B cells don’t phagocytose (P-4), neutrophils don’t cause histamine allergies (Q-3), T cells provide cell-mediated not humoral immunity (R-1), mast cells aren’t cytotoxic (S-2).

• Option (D) P-4, Q-3, R-2, S-1
  Partial: R-2 (T cells-cytotoxicity) correct. Wrong: P-4 (B cells not phagocytic), Q-3 (neutrophils not allergy mediators), S-1 (mast cells don’t produce antibodies for humoral immunity).

Key Takeaways for Immunology Students

• Innate vs. Adaptive: Neutrophils/mast cells (innate, rapid); B/T cells (adaptive, specific).

• Phagocytosis leaders: Neutrophils, macrophages—not lymphocytes.

• Allergy link: Mast cells/basophils via IgE-FcεRI crosslinking.

Master these for exams. Practice similar MCQs on platforms like Khan Academy or PubMed immunology reviews.