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  1. In which one of the following options the two examples are correctly matched with their particular type of immunity.
    1. Examples       Types of immunity
      Polymorphonuclear leukocytes and monocytes       Cellular barriers
    2. Examples       Types of immunity
      Anti-tetanus and antisnake bite injection       Active immunity
    3. Examples       Types of immunity
      Saliva in mouth and Tear in eyes       Physical barriers
    4. Examples       Types of immunity
      Mucus coating of epithelium lining the urinogenital tract-and the HCl in stomach       Physiological barriers
Correct Option: A

Polymorphonuclear leukocytes named so, as they have multilobed nucleus or neutrophils and monocytes are the cellular barrier provide innate or nonspecific immunity. Cellular barriers are the internal defence or second live of defence.


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