Question

A student on a school trip started sneezing and wheezing soon after reaching the hill station for no explained reasons. But, on return to the plains, the symptoms disappeared. What is such a response called ? How does the body produce it ?

Answer 1

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This response (sneezing and wheezing for no explained reasons) is called allergy. The immune response produces such exaggerated response against a substance called an allergen. The body produces IgE type of antibody against allergens as a response. An example of allergens includes pollen grains, dust etc. 
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$Some \: extra \: information \:$

Question:Define allergy and also give examples of two symptoms.
Answer-1.The damaging immune response of the body to a certain substance (allergen) due to hypersensitivity is called as an allergy.

2.The following are the symptoms of allergic reaction:
1. Irritation of eyes and nose
2. Shortness of breath
3. Rashes
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Question-What What is an allergen?
Answer-1.An allergen is a type of antigen that produces an immune response and called as an allergy in which the immune system fights off a perceived threat that would otherwise be harmless to the body.
2.It is a non-infectious and capable of stimulating a type-I hypersensitivity reaction through immunoglobulin IgE.
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HOPE THIS HELPS YOU!!! ^_^
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