Question

Read the statements (A - D) related to secondary immune response and select the correct option. (T-true and F-false)

A. Secondary immune response is slow and long lived.
B. More antibodies are produced during secondary immune response compared to primary immune response.
C. Memory cells help in elevated immune response.
D. Secondary immune response occurs when the organism is exposed to a new antigen.

• A. A - F, B - F, C - T, D - T
• B. A - T, B - F, C - T, D - T
• C. A - F, B - T, C - T, D - F
• D. A - T, B - F, C - T, D - F

Answer 1

The correct option is C A - F, B - T, C - T, D - F

The specific reactivity shown by an organism to an antigenic stimulus is called immune response. It is of two types, they are the primary immune response and secondary immune response.

• Primary immune response: The immune response shown by the organism as a result of the first encounter with an antigen. It takes a relatively longer time to respond to the antigen and is of low intensity.
• Secondary immune response: A subsequent encounter by the immune system with the same antigen results in an elevated immune response, which is rapid and lasts for a longer period. This is due to the fact that first encounter appears to have memory of the first encounter. Hence, memory B cells produced during primary response respond quickly and produce a large number of antibodies.

Figure: Immune response
Hence, B and C statements are true and A and D statements are false.