Human Health and Diseases Question 67

67. Select the correct statement with respect to diseases and immunisation?

[2011M]

(a) Ifdue to somereason B-and T-lymphocytes are damaged, the body will not produce antibodies against a pathogen

(b) Injection of dead / inactivated pathogens causes passive immunity

(c) Certain protozoans have been used to mass produce hepatitis $B$ vaccine.

(d) Injection of snake antivenom against snake bite is an example of active immunisation

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Answer : a

Hints & Solutions

(a) B and T-lymphocytes produce antibodies against pathogen in the body, if due to some reason $B$ and $T$ lymphocytes are damaged the body will not produce antibodies against a pathogen. Each B cell and T cell is specific for a particular antigen.