Select the incorrect statement with respect to acquired immunity:
Answer: (D) Acquired immunity is non-specific type of defense present at the time of birth. Answer: (D) Acquired immunity is non-specific type of defense present at the time of birth Solution: This statement is INCORRECT and is therefore the answer.
- 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✓
Correct Answer
(D) Acquired immunity is non-specific type of defense present at the time of birth
Solution & Explanation
Answer: (D) Acquired immunity is non-specific type of defense present at the time of birth Solution: This statement is INCORRECT and is therefore the answer. Acquired immunity is pathogen-specific and is characterised by memory; it is INNATE immunity that is the non-specific defence present at the time of birth. The other three statements correctly describe acquired immunity's primary response (first encounter) and anamnestic/secondary response (due to memory of the first encounter). Why others are wrong: A, B and C are all accurate NCERT descriptions of acquired immunity, so they are not the incorrect statement. NCERT Reference: NCERT Ch7, p.134 lines 32-33 and p.135 lines 9-16: "Innate immunity is non-specific type of defence, that is present at the time of birth"