Selina Concise Biology Class 7 ICSE Solutions – Allergy Selina Concise ICSE Solutions for Class 7 Biology Chapter 7 Allergy Review Questions Question 1. Define the term allergy. Answer : Allergies, also known as allergic diseases, are a number of conditions caused by hypersensitivity of the immune system to something in the environment that usually causes no adverse effects to most people. These diseases include hay fever, dermatitis, asthma, food allergies, etc. Question 2. Name the inflammatory chemical released by the basophils causing skin reaction and construction of bronchioles. Answer : The histamine causes inflammation, skin rash and constriction of the bronchioles (as in asthma). Question 3. How the allergy causing chemical is naturally removed from the body? Answer : There is no permanent cure for allergy. Medication for allergies does give relief. Those people prone to allergic reactions should be aware of the allergens that trigger these responses in their bodies and avoid