Question

Assertion (A): Secondary immune response is quicker and stronger than the primary immune response.
Reason (R): Our body appears to have the memory of the first encounter therefore response to the subsequent encounter with the same pathogen is quick.

• A. Both (A) and (R) are true and (R) is the correct explanation of (A).
• B. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
• C. (A) is true, but (R) is false.
• D. (A) is false, but (R) is true.

Hint:

Memory cells help the immune system respond faster and more robustly upon second exposure to the same antigen.

Answer 1

The Correct Option is A

Step 1: In the immune system, secondary response is faster and more effective than the primary response, so Assertion (A) is true.
Step 2: This is due to memory B and T cells formed during the first encounter, which makes Reason (R) true.
Step 3: Since memory is the reason for faster secondary response, (R) correctly explains (A).
Thus, both (A) and (R) are true and (R) is the correct explanation of (A).