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Revision Notes
Allergy — Revision Notes
ICSE · Class 7 · Biology
Allergy revision notes for ICSE Class 7 Biology: 4 topics in quick points. Part of the ICSE Class 7 Biology syllabus.
63 questions26 flashcards5 concepts
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Key Topics to Revise
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1. Meaning and Cause of Allergy
- The concept of allergy was introduced in 1906 by Clemens Von Pirquet.
- Allergy in Greek means 'other work'.
- Allergic diseases are caused by hypersensitivity of the immune system to something in the environment that usually does not harm most people.
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2. Entry Routes and Common Allergens
- Allergens can enter the body through the skin, mouth, or nose.
- Skin contact allergens include substances such as latex, certain clothes, and insect bites.
- Mouth entry is common with food allergens.
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3. Symptoms and Common Allergic Reactions
- Allergic reactions may affect the nose, eyes, skin, lungs, digestive system, and blood circulation.
- Inhaled allergens can cause irritation of the nose, sneezing, coughing, wheezing, red and watery eyes, mucus in the lungs, and shortness of breath.
- Food allergy can cause abdominal pain, bloating, vomiting, diarrhoea, itchy skin, and swelling of the skin.
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4. Diagnosis of Allergy
- Allergy testing helps confirm or rule out allergies.
- Two equally valid methods are used for diagnosis: skin prick test and allergy blood test.
- Skin prick test is also called puncture testing or prick testing.
Get complete notes with diagrams and examples
Full NotesKey Concepts
Allergy is a hypersensitive reactionAn allergen is any substanceThese proteins are produced byHistamine is an inflammatory chemical releasedAllergens commonly enter the body through
Frequently Asked Questions
What are the important topics in Allergy for ICSE Class 7 Biology?
Key topics in Allergy include Meaning and Cause of Allergy, Entry Routes and Common Allergens, Symptoms and Common Allergic Reactions, Diagnosis of Allergy. Study these first, then practise questions on each for Class 7 exams.
How should I revise Allergy for Class 7 exams?
Learn the core ideas first, then work through the 63 practice questions on Allergy. Revise definitions regularly and use flashcards for quick recall before the exam.
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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