A student on a school picinic to a park on windy day started sneezing and haivng difficulty in breathing on reaching the park. The teacher enquired whether the student allergic to something. What is allergy?

A student on a school picinic to a park on windy day started sneezing and haivng difficulty in breathing on reaching the park. The teacher enquired whether the student allergic to something. Write two characterstis of the system involved in theresponse observed in the student.

A student on a school picnic to a park on a windly day started sneezing and having difficulty in breathing on reaching the park. The teacher enquired whether the student was allergic to something .