Q. Select the correct statement with respect to diseases and immunisation
A) Certain protozoans have been used to mass produce hepatitis B vaccine
B) Injection of snake antivenom against snake bite is an example of active immunisation
C) If due to some reason B- and T-lymphocytes are damaged, the body will not produce antibodies against a pathogen
D) Injection of dead / inactivated pathogens causes passive immunity
Explanation
[Solution from source] B-lymphocytes produce antibodies and need helper T-cells to do so, so damage to both lymphocyte types stops antibody production against a pathogen. Hepatitis B vaccine is produced in yeast, not protozoans; snake antivenom supplies ready-made antibodies (passive immunity); and dead or inactivated pathogens stimulate the body's own response (active immunity). Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.