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Chapter Summary

Allergy

ICSE · Class 7 · Biology

Summary of Allergy for ICSE Class 7 Biology. Key concepts, important points, and chapter overview.

63 questions26 flashcards5 concepts

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Overview

Allergy is a special reaction of the immune system to a substance that usually does not harm most people. The substance that causes the reaction is called an allergen. Common allergic diseases include hay fever, dermatitis, asthma, and food allergies. During an allergy, the body produces immunoglobu

Key Concepts

Allergy is a hypersensitive reaction

Allergy is a hypersensitive reaction of the immune system to a normally harmless substance. The concept was introduced in 1906 by Clemens Von Pirquet.

An allergen is any substance

An allergen is any substance that causes allergy. Common allergens include dust, spores, pollen, insect stings, certain clothes, food, and some medici

These proteins are produced by

These proteins are produced by the immune system and are specific to an allergen. They bind to the allergen and then to white blood cells.

Histamine is an inflammatory chemical released

Histamine is an inflammatory chemical released after immunoglobulin proteins bind to the allergen and then to white blood cells. It causes symptoms li

Allergens commonly enter the body through

Allergens commonly enter the body through the skin, mouth, and nose. Skin contact may occur with latex, clothes, or insect bites. Food enters through

Learning Objectives

  • Define allergy and allergen.
  • Identify common allergens and their entry routes through the skin, mouth, and nose.
  • Describe the role of immunoglobulin proteins and histamine in allergic reactions.
  • Recognize common allergic reactions such as hay fever, asthma, hives, and anaphylaxis.
  • Understand the main methods used to diagnose allergy.

Frequently Asked Questions

What are the important topics in Allergy for ICSE Class 7 Biology?
Allergy covers several key topics that are frequently asked in ICSE Class 7 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Allergy — ICSE Class 7 Biology?
Understand the core concepts first, then work through the 63 practice questions available for this chapter. Revise formulas and 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.

More resources for Allergy

All 8 chapters — ICSE Class 7 Biology Chapter Summary

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