Match List-I with List-II:
| List-I | List-II |
|---|---|
| Defensive barriers | Examples |
| (A) Cellular barriers | (I) Skin |
| (B) Cytokine barriers | (II) Interferons |
| (C) Physical barriers | (III) Saliva |
| (D) Physiological barriers | (IV) Natural killer cells |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → (A)-(IV), (B)-(II), (C)-(I), (D)-(III)
(A) Cellular barriers — this matches (IV) Natural killer cells. Some white blood cells, such as neutrophils, monocytes and natural killer cells (a type of lymphocyte), and macrophages in the tissues, destroy microbes. Because the barrier is made of cells, it is a cellular barrier.
(B) Cytokine barriers — this matches (II) Interferons. Cells infected by a virus release proteins called interferons. They protect the uninfected cells nearby from further viral infection.
(C) Physical barriers — this matches (I) Skin. The skin is a physical wall that stops microbes from entering. The mucus coating of the respiratory, digestive and urogenital tracts also traps microbes.
(D) Physiological barriers — this matches (III) Saliva. Body secretions such as acid in the stomach, saliva in the mouth and tears from the eyes check the growth of microbes.
Note: A similar question was also asked in CUET (UG) 2022 on 30-08-2022 (Slot 2).