Question

Match the immunological statements in Column I with the appropriate descriptions from Column II. 

• A. P–(ii); Q–(iii); R–(iv); S–(i)
• B. P–(iv); Q–(iii); R–(i); S–(ii)
• C. P–(iv); Q–(ii); R–(iii); S–(i)
• D. P–(i); Q–(iv); R–(iii); S–(ii)

Hint:

Immunity layers: - First line = surface barriers (skin, mucous).
- Second line = innate responses (complement, interferons).
- Active acquired = developed after infection/vaccination.
- Passive natural = antibodies from mother (placenta/milk).

Answer 1

The Correct Option is A

Step 1: Analyze Column I terms.
- Active acquired immunity: Immunity developed after exposure to pathogens (direct contact with pathogens). $⇒$ (ii).
- First line of defense: Physical and chemical surface barriers like skin, mucous membranes. $⇒$ (iii).
- Passive natural immunity: Antibodies passed from mother to child across the placenta. $⇒$ (iv).
- Second line of defense: Innate immune responses involving complement proteins, interferons, phagocytes. $⇒$ (i).
Step 2: Compile the matches.
P–(ii), Q–(iii), R–(iv), S–(i). Therefore, the correct answer is (A).