Q. 14

Give reasons for

Answer :

a) ) Antibody mediated immunity is called humoral immunity because it is mediated by antibodies, macromolecules in the extracellular fluid ,complement proteins present in the blood also known as humoral immunity.


b) When the child is vaccinated some weak pathogens (bacteria,virus etc.) are made to enter the body this causes an immune response in the body. Whenever the real pathogen enters the body, the body recognizes the pathogen and the same response is produced inside the body to combat the disease.


c) Whenever the AIDS virus enters the body the HIV or Human Immuno Deficiency virus attacks the helper T-cells of the immune system which further compromises a person’s immune system.


OR


a)



b) Mechanical carriers of the disease are pathogens which carries disease from one host to another. Typhoid is the disease that is carried by the mechanical carrier which is the bacteria salmonella typhi.


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