GATE 2022 BT – Question 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 |
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Correct answer: (B) P-1, Q-4, R-2, S-3
Explanation
Match each cell type with its immune function.
- **P. B cells:** produce antibodies, which are the effectors of **humoral immunity**. P-1.
- **Q. Neutrophils:** the most abundant white cells; they engulf and kill microbes by **phagocytosis**. Q-4.
- **R. T cells:** cytotoxic (CD8⁺) T cells kill infected or abnormal cells, which is **cytotoxicity**. R-2.
- **S. Mast cells:** release **histamine** from granules, causing the symptoms of allergy. S-3.
Match: **P-1, Q-4, R-2, S-3** (option B).