Q163 / 180 · NEET 2019 (Odisha) · Zoology

Humans have acquired immune system that produces antibodies to neutralise pathogens. Still innate immune system is present at the time of birth because it

  • A
    is very specific and uses different macrophages
  • B
    produces memory cells for mounting fast secondary response
  • Correct answer
    C
    has natural killer cells which can phagocytose and destroy microbes
  • D
    provides passive immunity

Solution

Innate immunity is non-specific type of defence that is present at the time of birth because it has natural killer cells which can phagocytose and destroy microbes (cellular barriers). Other forms of innate immunity are physical barriers, physiological and cytokine barriers.

Hence, the correct answer is option: 'C'.

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