Question

A student on a picnic to a park on a windy day stared sneezing and having difficulty in breathing on reaching the park. The teacher enquired whether the student was allergic to something.
(a) What is an allergy?
(b) Write the two unique characteristics of the system involved in the response observed in the student?

Answer 1

a) The exaggerated response of the immune system to certain antigens present in the environment is called allergy.

(b) The system involved is immune system. The unique characteristics are:

(i) It recognizes foreign antigens & responds to them.

(ii) It has memory and so it remember antigens.