Q. Consider the following pairs regarding the types of immunity and their components:
1.Physiological Barrier: Skin and Mucous membranes
2.Cellular Defence: Macrophages and Natural Killer cells
3.Chemical Mediators: Antibodies (Humoral immunity)
Which of the pairs given above are correctly matched?

[A] 2 only

[B] 2 and 3 only

[C] 1 and 3 only

[D] 1 and 2 only

Answer: B
Notes:

Explanation:

  • Pair 1 is incorrectly matched: Skin is a Physical/Anatomical barrier. Physiological barriers include body temperature, pH of the stomach, and tears.
  • Pair 2 is correctly matched: Macrophages are specialized cells that engulf and destroy pathogens.
  • Pair 3 is correctly matched: Antibodies are proteins (chemical mediators) that neutralize pathogens in body fluids.
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