Acquired immunity

During a camping trip, Arun undergoes a long-drawn illness due to a bacterial infection. A few months later, he drinks some contaminated water that contains the same bacteria. This time, however, Arun only experiences mild uneasiness and recovers rapidly.

Why is Arun able to fight off the infection better the second time around?

(Choice A)
Only secondary responses produce antibodies against bacteria.
(Choice B)
Arun’s immune system recognizes the bacteria and fights them faster.
(Choice C)
The primary response is not specific to the bacteria
(Choice D)
Arun remembers that he had a previous infection and is more careful the second time.

UP Class 12th Biology

Course: UP Class 12th Biology > Unit 7

Problem