NEET 2012 Biology question

In which one of the following options the two examples are correctly matched with their particular type of immunity ?

(1)Examples: Mucus coating of epithelium lining the urinogenital tract and the HCl in stomach; Type of immunity: Physiological barriers
(2)Examples: Polymorpho-nuclear leukocytes and monocytes; Type of immunity: Cellular barriersCorrect
(3)Examples: Anti-tetanus and anti-snake bite injections; Type of immunity: Active immunity
(4)Examples: Saliva in mouth and Tears in eyes; Type of immunity: Physical barriers

Answer: (2)

Solution

Innate immunity has four types of barriers. Cellular barriers: certain WBCs, namely polymorphonuclear leukocytes (neutrophils), monocytes and natural killer lymphocytes, and macrophages, which phagocytose microbes. So option (2) is correct. Option (1) is incorrect: mucus coating of the epithelium is a physical

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Question ID VK-091174