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InterviewSolution
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Question : Define immunity and name two different types of immunity. |
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Answer» Solution :It is the overall ability of the host to fight the disease-causing organisms conferred by the immune system. (i) Innate immunity and (II) Acquired immunity.  Detailed ANSWER: (a) Immunity It is the ability of the immune system of the body to fight against the dis ease-causing organisms. It is of TWO types namely Innate inmunity and Acquired immunity. (i) Innate Immunity It is the non-specific defense present at the time of birth. It provides BARRIERS to the entry of foreign agents into our body. (ii) Acquired Immunity It is a pathogen specific immunity. It is not present since birth but develops during the life time of an individual. It is characterized by memory i.e. during first encounter of a pathogen, our body produces primary. response in low intensity. Second encounter with the same pathogen produces a secondary (anamnestic). response in high intensity. The primary and secondary immune RESPONSES are carried out with B-lymphocytes and T-lymphocytes. B-lymphocytes (B-cells): Produce antibodies. T-lymphocytes : Help B-cells to produce antibodies. |
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