Multiple choice questions XXVIII — task. Science CBSE, Class 9.

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1. The antigen present in pathogen is

a specific protein involved in metabolism
polysaccharide synthesized by it in the host
a specific protein or polysaccharide present on its coat
a specific protein involved in metabolism and polysaccharide synthesized by it in the host

2. Specific defence mechanism against disease comprises

physical barrier
immune system
lysozme
phagocytes

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