NCERT Biology class 12 online notes - Pathogen Takshila Learning offers animated videos, NCERT solutions, question bank and sample papers for school courses and designed according to latest pattern of CBSE question papers. Further, Takshila learning also provides online classes for CS Course, Banking exam preparation, and Digital Marketing. We regularly provide different blogs and articles on important articles, news, and information related to CBSE exams. Biology class 12 : We define a pathogen as a biological agent that causes disease or illness to its host (an organism which is attacked by the pathogen). Most often the pathogens disrupt the normal physiology of a multi-cellular animal or plant. However, pathogens can infect unicellular organisms from all of the biological kingdoms. There are several substrates and pathways whereby pathogens can invade a host. The human body contains many natural defenses against some of the common pathogens in the form of the human immu
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