Match List-I with List-II
| List-I Barriers | List-II Examples |
|---|---|
| (A) Physical barrier | (I) Acid in the stomach |
| (B) Cellular barrier | (II) Interferons |
| (C) Cytokine barrier | (III) Leucocytes in our body |
| (D) Physiological barrier | (IV) Skin on our body |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A)-(IV), (B)-(III), (C)-(II), (D)-(I)
(A) Physical barrier — this matches (IV) Skin on our body. The skin is a layer that stops micro-organisms from entering the body, just as a wall would. The mucus coating of the respiratory, gastrointestinal and urogenital tracts works in the same way.
(B) Cellular barrier — this matches (III) Leucocytes in our body. Here cells do the defending: some leucocytes (white blood cells), such as neutrophils and monocytes, and macrophages in tissues swallow and destroy microbes.
(C) Cytokine barrier — this matches (II) Interferons. Interferons are proteins secreted by virus-infected cells. They protect the non-infected cells from further viral infection.
(D) Physiological barrier — this matches (I) Acid in the stomach. The body’s own fluids act here. The acid of the stomach kills many microbes that come in with food, as do saliva in the mouth and tears in the eyes.
Note: A similar question was also asked in CUET (UG) 2025 on 20-05-2025 (Slot 1).