Question

Identify the correct statement with reference to immunity.

• A. When ready-made antibodies are directly given, it is called “passive immunity”
• B. Active immunity is quick and give its full effective response in less time
• C. Foetus receives IgG antibodies from mother through placenta, it is an example of natural active immunity
• D. If a person is infected with tetanus bacterium (Clostridium tetani), immunisation with anti-tetanus serum will provide active immunity to the person

Answer 1

The correct option is A When ready-made antibodies are directly given, it is called “passive immunity”

Active immunity is slow due to presence of lag phase. IgG antibodies pass from mother’s body to embryo/foetus through placenta which is an example of natural passive immunity. Anti-tetanus serum injected to injured individual is an example of artificial passive immunity.