Read the following statements carefully: (A) Innate immunity is a pathogen-specific type of defence present at the time of birth. (B) Skin on our body is the main physical barrier which prevents entry of the micro-organisms. (C) Saliva in the mouth and tears from eyes are cellular barriers of innate immunity. (D) Virus-infected cells secrete proteins called interferons which form cytokine barriers. How many of the ab

Step-by-step solution

Statement (A) is incorrect because innate immunity is a non-specific type of defence, whereas acquired immunity is pathogen-specific. Statement (B) is correct as skin is the main physical barrier preventing the entry of micro-organisms. Statement (C) is incorrect because saliva in the mouth and tears from eyes are physiological barriers, not cellular barriers. Cellular barriers include certain types of leukocytes like PMNL-neutrophils and monocytes. Statement (D) is correct as virus-infected cells secrete interfero