Question

Select the incorrect statement with respect to acquired immunity:

• A. Primary response is produced when our body encounters a pathogen for the first time.
• B. Anamnestic response is elicited on subsequent encounters with the same pathogen
• C. Anamnestic response is due to memory of first encounter
• D. Acquired immunity is non-specific type of defense present at the time of birth

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
The immune system is divided into Innate immunity (present at birth, non-specific) and Acquired immunity (developed after birth, highly specific).
Detailed Explanation:
- (1) Correct: The first contact with a pathogen results in a low-intensity primary response.
- (2) Correct: Subsequent encounters with the same pathogen elicit a highly intensified secondary or anamnestic response.
- (3) Correct: The secondary response is faster and stronger because the immune system "remembers" the previous encounter (memory-based).
- (4) Incorrect: Innate immunity is the non-specific defense present at birth. Acquired immunity is pathogen-specific and is acquired during the lifetime of an individual.
Step 2: Final Answer:
Statement (4) incorrectly describes acquired immunity by attributing characteristics of innate immunity to it.