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Discussion

Acquired immunity as developed after vaccination or infection is found in

  • A.Vertebrates only
  • B.Invertebrates as well as vertebrates
  • C.Plants
  • D.All the above

Answer: A

Correct answer: Vertebrates only

Acquired immunity - lymphocytes, antibodies, and memory of a specific antigen - is found only in vertebrates. Invertebrates and plants have effective innate defences, including phagocytic cells and antimicrobial peptides, but nothing that recognises one antigen and remembers it.

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