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Assertion : Mucous membrane immobilises the micro-organisms in the body.
Reason : Microoganisms and dust particles entering the respiratory tract are trapped in the mucus.
A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertin is true but reason is false.
D. If both assertion and reason are false.

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Correct Answer - A
Innate immunity is non-specific type of defence, that is accomplished by providing different types of defence, that is accomplished by providing different types of barries to the entry of the foregin agents into our body. Mucus coating of the epithelium lining in the respiratory, gastrointestinal and urogenital tracts traps microbes and prevents their entry in our body.

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