| List-I | List-II | ||
| (a) | Cellular barrier | (i) | Interferons |
| (b) | Cytokine barrier | (ii) | Mucus |
| (c) | Physical barrier | (iii) | Neutrophils |
| (d) | Physiological barrier | (iv) | HCI in gastric juice |
| (a) | (b) | (c) | (d) | |
| 1. | (ii) | (iii) | (iv) | (i) |
| 2. | (ii) | (iii) | (i) | (iv) |
| 3. | (iii) | (iv) | (ii) | (i) |
| 4. | (iii) | (i) | (ii) | (iv) |
MALT constitutes about __________percent of the lymphoid tissue in human body.
| 1. | 50% | 2. | 20% |
| 3. | 70% | 4. | 10% |