1. Introduction to Allergy

An allergy is a condition in which the body’s immune system reacts strongly to certain substances that are usually harmless.

These substances are called allergens.

When an allergen enters the body, the immune system treats it as harmful and produces a reaction, which causes symptoms like sneezing, itching, swelling, or rashes.

2. What is an Allergen?

An allergen is any substance that can cause an allergic reaction.

Different people may be allergic to different substances.

Common Allergens

Dust
Pollen
Pet hair
Certain foods
Medicines
Insect stings
Mold

3. How Allergies Occur

When an allergen enters the body:

The immune system identifies it as harmful.
The body produces chemicals like histamine.
Histamine causes inflammation and irritation.
This leads to allergic symptoms.

4. Types of Allergies

Allergies can affect different parts of the body.

1. Respiratory Allergies

These affect the nose and lungs.

Examples

Sneezing
Runny nose
Coughing
Breathing difficulty

One common respiratory allergy is .

2. Skin Allergies

These affect the skin.

Symptoms

Itching
Redness
Swelling
Rashes

Examples include:

3. Food Allergies

Some foods can cause allergic reactions.

Common Food Allergens

Milk
Eggs
Peanuts
Seafood
Wheat

Symptoms

Vomiting
Stomach pain
Swelling of lips
Skin rashes

4. Drug Allergies

Certain medicines may cause allergies in some people.

Examples:

Antibiotics
Painkillers

Symptoms may include:

Skin rash
Fever
Breathing problems

5. Symptoms of Allergy

Common symptoms include:

Sneezing
Runny nose
Itchy eyes
Skin rashes
Swelling
Difficulty breathing
Watery eyes

Severe allergic reactions can be dangerous.

6. Severe Allergy (Anaphylaxis)

A very serious allergic reaction is called .

Symptoms

Sudden drop in blood pressure
Swelling of throat
Difficulty breathing
Dizziness

This condition requires immediate medical treatment.

7. Causes of Allergy

Allergies can occur due to many reasons.

Common Causes

Dust mites
Pollen from plants
Animal fur
Certain foods
Insect bites
Pollution
Chemicals

8. Diagnosis of Allergies

Doctors use different methods to identify allergies.

1. Skin Test

A small amount of allergen is placed on the skin to observe the reaction.

2. Blood Test

Checks immune response to allergens.

9. Treatment of Allergies

Treatment depends on the type of allergy.

1. Avoiding Allergens

The best way is to stay away from the substance causing allergy.

2. Medicines

Doctors may prescribe medicines like to reduce symptoms.

3. Immunotherapy

Small doses of allergens are given to gradually reduce sensitivity.

10. Prevention of Allergies

Some simple steps can help prevent allergies.

Prevention Tips

Keep surroundings clean
Avoid dusty areas
Wash hands frequently
Avoid foods that trigger allergies
Maintain good hygiene
Use masks in polluted environments

11. Difference Between Allergy and Infection

Feature	Allergy	Infection
Cause	Reaction to allergen	Caused by microbes
Spread	Not contagious	Can spread
Immune response	Overreaction	Defense against germs
Example	Pollen allergy	Flu

12. Importance of the Immune System

The immune system protects the body from harmful substances.

However, in allergies the immune system overreacts to harmless substances.

This causes inflammation and symptoms.

13. Key Terms

Term	Meaning
Allergy	Immune reaction to harmless substances
Allergen	Substance causing allergy
Histamine	Chemical causing allergic symptoms
Antihistamine	Medicine to treat allergies
Immune system	Body’s defense system

14. Summary

Allergies occur when the immune system reacts strongly to harmless substances called allergens. Common allergens include dust, pollen, food, and medicines. Allergic reactions may affect the skin, nose, lungs, or digestive system. Symptoms include sneezing, itching, swelling, and rashes. Allergies can be controlled by avoiding allergens, taking medicines, and maintaining good hygiene.

✅ If you want, I can also provide:

MCQs and exam questions from the Allergy chapter
1-page quick revision notes for exams
Worksheets and fill-in-the-blanks for practice
A longer 4000–5000 word ICSE exam version of this chapter.

Allergy – Class 7 Notes

1. What is an Allergy?

An allergy is an abnormal reaction of the body’s immune system to certain substances that are usually harmless. These substances are called allergens.

When an allergen enters the body, the immune system treats it as harmful and produces chemicals such as histamine, which causes allergy symptoms.

Examples:

Dust allergy
Pollen allergy
Food allergy

2. What are Allergens?

Allergens are substances that cause allergic reactions in sensitive people.

Common allergens include:

Dust and dust mites
Pollen from plants
Animal hair or fur
Certain foods (peanuts, eggs, milk)
Insect bites
Medicines
Mold spores

3. Causes of Allergy

Allergies occur when the immune system overreacts to harmless substances.

Main causes:

Hereditary factors (genetics)
Environmental pollution
Weak immune system
Exposure to allergens
Certain foods or medicines

4. Types of Allergies

Allergies can affect different parts of the body.

1. Respiratory Allergies

Affect the nose and lungs.

Examples:

Sneezing
Runny nose
Asthma

2. Skin Allergies

Affect the skin.

Examples:

Rashes
Itching
Redness
Eczema

3. Food Allergies

Caused by certain foods.

Examples:

Peanuts
Milk
Eggs
Shellfish

4. Drug Allergies

Caused by medicines such as antibiotics.

5. Symptoms of Allergy

Common symptoms include:

Sneezing
Runny or blocked nose
Coughing
Itchy eyes
Skin rashes
Swelling
Breathing difficulty

Severe allergic reaction is called anaphylaxis, which is a medical emergency.

6. How Allergic Reaction Occurs

Allergen enters the body.
The immune system produces antibodies.
Histamine is released.
Symptoms such as itching, swelling, and sneezing appear.

7. Common Allergic Diseases

Some diseases caused by allergies include:

Asthma
Hay fever
Eczema
Allergic rhinitis
Urticaria (hives)

8. Diagnosis of Allergy

Doctors diagnose allergies using:

Skin prick test
Blood test
Allergy patch test
Medical history

9. Prevention of Allergies

Allergies can often be prevented by avoiding allergens.

Prevention methods:

Keep surroundings clean
Avoid dust and pollen
Maintain good hygiene
Use masks in polluted areas
Avoid foods that cause allergy

10. Treatment of Allergies

Common treatments include:

Antihistamine medicines
Steroid creams or inhalers
Allergy shots (immunotherapy)
Avoiding allergens

11. First Aid for Allergic Reaction

If someone has an allergic reaction:

Remove the allergen if possible.
Give antihistamine medicine.
Apply cold compress on swelling.
Seek medical help if symptoms are severe.

Sample Paper – Allergy Chapter (Class 7)

Section A – MCQs

Choose the correct answer.

A substance that causes allergy is called
a) Pathogen
b) Allergen
c) Antibody
d) Virus
Allergy occurs due to
a) Digestive system
b) Immune system reaction
c) Circulatory system
d) Nervous system
Histamine causes
a) Growth
b) Allergy symptoms
c) Digestion
d) Blood clotting
Example of food allergy
a) Rice
b) Apple
c) Peanut
d) Water
Skin allergy may cause
a) Fever
b) Rashes
c) Fracture
d) Paralysis

Section B – Fill in the Blanks

Allergy-causing substances are called __________.
The chemical released during allergy is __________.
Sneezing and runny nose are symptoms of __________ allergy.
Severe allergic reaction is called __________.
Allergy can be prevented by avoiding __________.

Section C – True or False

Allergies occur due to immune system reaction.
Dust cannot cause allergy.
Skin rashes are a symptom of allergy.
All people have the same allergies.
Allergies can sometimes be hereditary.

Section D – Short Answer Questions

What is an allergy?
What are allergens?
Name three symptoms of allergy.
What is food allergy?
What is histamine?

Section E – Long Answer Questions

Explain the causes and symptoms of allergy.
Describe different types of allergies.
Explain prevention and treatment of allergies.
How does an allergic reaction occur in the body?

If you want, I can also give:

3000–5000 word detailed Allergy chapter notes for ICSE
Extra 50 MCQs for exams
Assertion–Reason questions
Diagram based questions
2–3 full sample test papers.

Here are more detailed notes and extra sample paper questions for the Allergy chapter (Class 7 level).

Allergy – Detailed Notes

1. Introduction

An allergy is a hypersensitive reaction of the body’s immune system to substances that are normally harmless. These substances are known as allergens.

When allergens enter the body, the immune system mistakenly identifies them as harmful and releases chemicals such as histamine, which causes the symptoms of allergy.

Allergies are common in many people and can affect children and adults. Some allergies are mild, while others may become severe.

2. Immune System and Allergy

The immune system protects the body from harmful microorganisms such as bacteria and viruses.

However, in allergic people, the immune system reacts strongly even to harmless substances.

Steps of Allergic Reaction

Allergen enters the body.
Immune system produces antibodies.
Chemical substances like histamine are released.
Allergy symptoms appear.

3. Common Allergens

Many substances can cause allergies.

Environmental Allergens

Dust
Pollen
Mold spores
Smoke
Pollution

Food Allergens

Milk
Eggs
Peanuts
Wheat
Fish
Shellfish

Animal Allergens

Pet hair
Animal fur
Bird feathers

Chemical Allergens

Perfumes
Cosmetics
Detergents
Medicines

4. Types of Allergies

1. Respiratory Allergies

These affect the nose, throat, and lungs.

Examples:

Sneezing
Runny nose
Nasal congestion
Asthma

2. Skin Allergies

These affect the skin.

Examples:

Rashes
Itching
Swelling
Redness
Eczema

3. Food Allergies

These occur after eating certain foods.

Symptoms include:

Vomiting
Stomach pain
Skin rashes
Swelling

4. Drug Allergies

Some medicines can cause allergic reactions.

Examples:

Antibiotics
Painkillers

5. Symptoms of Allergy

Common allergy symptoms include:

Respiratory Symptoms

Sneezing
Runny nose
Cough
Breathing difficulty

Skin Symptoms

Itching
Red spots
Swelling
Hives

Eye Symptoms

Red eyes
Watery eyes
Itchy eyes

Digestive Symptoms

Vomiting
Stomach pain
Diarrhea

6. Severe Allergic Reaction

A severe allergic reaction is called anaphylaxis.

It can cause:

Difficulty breathing
Drop in blood pressure
Swelling of throat
Loss of consciousness

This condition requires immediate medical treatment.

7. Diagnosis of Allergy

Doctors use different methods to identify allergies.

1. Skin Prick Test

A small amount of allergen is placed on the skin.

2. Blood Test

Measures allergy antibodies in blood.

3. Patch Test

Used mainly for skin allergies.

8. Treatment of Allergy

1. Antihistamines

Medicines that reduce allergy symptoms.

2. Steroids

Used for severe allergic reactions.

3. Immunotherapy

Allergy shots that reduce sensitivity to allergens.

4. Avoidance

The best way to prevent allergy is avoiding allergens.

9. Prevention of Allergy

Ways to prevent allergies include:

Keeping house clean
Avoiding dust and pollen
Washing bedding regularly
Avoiding foods that cause allergy
Using masks in polluted areas
Keeping pets clean

10. Difference Between Infection and Allergy

Infection	Allergy
Caused by bacteria or viruses	Caused by allergens
Can spread from person to person	Cannot spread
Requires antibiotics sometimes	Treated with antihistamines

1. Extra MCQs (Multiple Choice Questions)

Allergy is a reaction of the
a) Digestive system
b) Nervous system
c) Immune system
d) Circulatory system
Substances that cause allergies are called
a) Pathogens
b) Allergens
c) Antibodies
d) Hormones
Which of the following is a common allergen?
a) Oxygen
b) Dust
c) Water
d) Nitrogen
Histamine causes
a) Allergy symptoms
b) Digestion
c) Growth
d) Blood clotting
Skin allergies may cause
a) Fracture
b) Itching
c) Paralysis
d) Blindness
Sneezing and runny nose are symptoms of
a) Food allergy
b) Respiratory allergy
c) Skin allergy
d) Drug allergy
Which food commonly causes allergy?
a) Rice
b) Peanut
c) Wheat
d) Potato
Severe allergic reaction is called
a) Infection
b) Asthma
c) Anaphylaxis
d) Fever
Allergy testing on the skin is called
a) Skin prick test
b) Blood test
c) X-ray
d) MRI
The best way to prevent allergy is
a) Avoid allergens
b) Eat more food
c) Exercise daily
d) Drink milk

2. Assertion – Reason Questions

Choose the correct answer.

A. Both Assertion and Reason are true and Reason explains Assertion.
B. Both Assertion and Reason are true but Reason does not explain Assertion.
C. Assertion is true but Reason is false.
D. Assertion is false but Reason is true.

Assertion: Allergy occurs due to immune system reaction.
Reason: Immune system releases histamine during allergy.

Assertion: Dust can cause allergy.
Reason: Dust contains tiny particles that act as allergens.

Assertion: All people suffer from allergies.
Reason: Allergies depend on immune system sensitivity.

Assertion: Antihistamines are used to treat allergies.
Reason: Antihistamines block the effect of histamine.

Assertion: Allergies are infectious diseases.
Reason: Allergies spread from person to person.

3. Case Study Questions

Case Study 1

Riya starts sneezing whenever she cleans her room or comes in contact with dust. Her eyes become watery and her nose starts running.

Questions:

What type of allergy does Riya have?
What substance is causing her allergy?
Name two symptoms shown by Riya.
Suggest one way she can prevent this allergy.

Case Study 2

A boy eats peanuts and suddenly develops itching, swelling on his lips, and difficulty breathing.

Questions:

What type of allergy is this?
Which food caused the reaction?
What is the severe allergic reaction called?
What should be done immediately?

4. Short Answer Practice Questions

Define allergy.
What are allergens?
Name four symptoms of allergy.
What is histamine?
What is food allergy?
What is respiratory allergy?
What is skin allergy?
Name two allergy tests.

5. Long Answer Questions

Explain the causes and symptoms of allergies.
Describe different types of allergies with examples.
Explain diagnosis and treatment of allergies.
Write preventive measures for allergies.

6. Full Sample Test Paper (Class 7)

Section A – Very Short Answer (1 mark)

Define allergy.
What are allergens?
Name one respiratory allergy.
Name one food allergen.
What is histamine?

Section B – Short Answer (2 marks)

Write two causes of allergies.
Write two symptoms of skin allergy.
What is food allergy?
What is anaphylaxis?

Section C – Short Notes (3 marks)

Respiratory allergies
Skin allergies
Food allergies

Section D – Long Answer (5 marks)

Explain how allergic reactions occur in the body.
Describe prevention and treatment of allergies.
Explain the role of the immune system in allergies.

✅ If you want, I can also provide:

A labelled diagram for the Allergy/immune reaction
150 more MCQs for exam preparation
A one-page quick revision sheet
Important ICSE exam questions from this chapter.

Good 👍 Here are more materials for the Allergy chapter (Class 7 ICSE) including important exam questions, a labelled diagram explanation, a quick revision sheet, and extra MCQs.

1. Important ICSE Exam Questions

Very Important Questions

Define allergy.
What are allergens? Give two examples.
What is histamine?
What is anaphylaxis?
Name two respiratory allergies.
Write four symptoms of allergy.
What is food allergy?
What are skin allergies?
Write two causes of allergies.
Write four methods to prevent allergies.

2. Labelled Diagram Explanation (Allergic Reaction)

Steps of Allergic Reaction

You can draw a simple diagram like this in exams:

Allergen enters body
        ↓
Immune system reacts
        ↓
Antibodies produced
        ↓
Histamine released
        ↓
Symptoms appear
(Sneezing, itching, swelling)

Labels for the Diagram

Allergen (dust, pollen etc.)
Immune system reaction
Antibodies
Histamine release
Allergy symptoms

3. Quick Revision Sheet (For Exams)

Definition

Allergy is an overreaction of the immune system to harmless substances called allergens.

Common Allergens

Dust
Pollen
Pet hair
Mold
Certain foods
Medicines

Symptoms

Sneezing
Runny nose
Itchy eyes
Skin rashes
Swelling
Breathing difficulty

Types of Allergies

Respiratory allergy
- Sneezing
- Asthma
Skin allergy
- Itching
- Rashes
Food allergy
- Vomiting
- Swelling
Drug allergy

Diagnosis

Skin prick test
Blood test
Patch test

Treatment

Antihistamines
Steroids
Immunotherapy

Prevention

Avoid allergens
Keep surroundings clean
Avoid polluted areas
Avoid foods causing allergy

4. Extra MCQs for Practice

Allergy is caused due to reaction of the
a) Digestive system
b) Immune system
c) Nervous system
d) Respiratory system
Which of the following is an allergen?
a) Oxygen
b) Dust
c) Nitrogen
d) Hydrogen
Histamine causes
a) Allergy symptoms
b) Digestion
c) Blood circulation
d) Growth
Which allergy affects the skin?
a) Respiratory allergy
b) Skin allergy
c) Food allergy
d) Drug allergy
Sneezing is mainly a symptom of
a) Skin allergy
b) Respiratory allergy
c) Food allergy
d) Drug allergy
Which food commonly causes allergies?
a) Rice
b) Peanut
c) Wheat
d) Potato
Severe allergic reaction is called
a) Fever
b) Asthma
c) Anaphylaxis
d) Infection
Allergy test done on skin is called
a) Skin prick test
b) X-ray
c) MRI
d) ECG
Medicines used for allergy are called
a) Antibiotics
b) Antihistamines
c) Vitamins
d) Hormones
Best prevention of allergy is
a) Avoid allergens
b) Eat more food
c) Drink milk
d) Exercise

✅ If you want, I can also prepare a complete 3000–5000 word ICSE Allergy chapter notes with diagrams, extra questions, and two full model test papers for exams.

Below is a complete extended study package for the Allergy chapter (Class 7 level) including detailed notes, diagrams (text form), 2 model test papers, extra MCQs, and revision points.

Allergy – Complete Notes (Class 7)

1. Introduction

An allergy is an unusual or hypersensitive reaction of the body’s immune system to certain substances that are normally harmless. These substances are called allergens.

When allergens enter the body, the immune system overreacts and produces chemicals such as histamine, which causes the symptoms of allergy.

Allergies are very common and may affect people of any age. Some allergies are mild, but others can be severe and may require immediate medical treatment.

2. Immune System and Allergy

The immune system protects the body from harmful microorganisms such as bacteria and viruses.

However, in allergic individuals, the immune system reacts strongly even to harmless substances like dust or pollen.

Process of Allergic Reaction

Allergen enters the body.
The immune system recognizes it as harmful.
Antibodies are produced.
Histamine and other chemicals are released.
Allergy symptoms appear.

3. Allergens

Allergens are substances that cause allergic reactions.

Common Allergens

Environmental Allergens

Dust
Pollen
Mold spores
Smoke
Air pollution

Food Allergens

Peanuts
Eggs
Milk
Fish
Wheat

Animal Allergens

Pet hair
Animal fur
Bird feathers

Chemical Allergens

Perfumes
Cosmetics
Detergents
Medicines

4. Types of Allergies

1. Respiratory Allergies

These affect the nose, throat, and lungs.

Symptoms include:

Sneezing
Runny nose
Nasal congestion
Coughing
Asthma

2. Skin Allergies

These affect the skin.

Symptoms include:

Itching
Rashes
Swelling
Redness
Eczema

3. Food Allergies

These occur when certain foods cause an allergic reaction.

Symptoms include:

Vomiting
Stomach pain
Skin rash
Swelling of lips or throat

4. Drug Allergies

Certain medicines can cause allergic reactions.

Examples include:

Antibiotics
Painkillers

5. Symptoms of Allergies

Respiratory Symptoms

Sneezing
Runny nose
Cough
Breathing difficulty

Skin Symptoms

Itching
Red patches
Swelling
Hives

Eye Symptoms

Watery eyes
Redness
Itching

Digestive Symptoms

Vomiting
Diarrhea
Stomach pain

6. Severe Allergic Reaction

A severe allergic reaction is called anaphylaxis.

Symptoms include:

Difficulty breathing
Swelling of throat
Drop in blood pressure
Dizziness
Loss of consciousness

Anaphylaxis is a medical emergency and requires immediate treatment.

7. Diagnosis of Allergy

Doctors use several methods to identify allergies.

1. Skin Prick Test

A small amount of allergen is placed on the skin to check reaction.

2. Blood Test

Detects antibodies in the blood.

3. Patch Test

Used mainly for skin allergies.

8. Treatment of Allergies

1. Antihistamines

These medicines block the effect of histamine.

2. Steroids

Used in severe allergic reactions.

3. Immunotherapy

Allergy shots reduce sensitivity to allergens.

4. Avoiding Allergens

The most effective prevention method.

9. Prevention of Allergies

Keep surroundings clean
Avoid dust and pollen
Wash bedding regularly
Avoid foods that cause allergies
Wear masks in polluted areas
Maintain good hygiene

10. Difference Between Allergy and Infection

Allergy	Infection
Caused by allergens	Caused by microbes
Not contagious	Often contagious
Treated with antihistamines	Treated with antibiotics or antivirals

Diagram – Allergic Reaction

Students can draw this simple diagram:

Allergen (dust/pollen)
        ↓
Immune system reacts
        ↓
Antibodies produced
        ↓
Histamine released
        ↓
Symptoms
(Sneezing, itching, swelling)

Model Test Paper 1

Section A – MCQs

Allergy is caused by
a) Virus
b) Allergen
c) Fungus
d) Parasite
Histamine is responsible for
a) Digestion
b) Allergy symptoms
c) Growth
d) Blood circulation
Sneezing is a symptom of
a) Skin allergy
b) Respiratory allergy
c) Food allergy
d) Drug allergy
Example of food allergen
a) Rice
b) Peanut
c) Salt
d) Sugar
Severe allergic reaction is called
a) Fever
b) Asthma
c) Anaphylaxis
d) Infection

Section B – Fill in the Blanks

Substances causing allergy are called __________.
Histamine causes __________ symptoms.
Dust and pollen cause __________ allergies.
Skin allergies cause __________ and rashes.
Severe allergic reaction is called __________.

Section C – Short Answer Questions

Define allergy.
What are allergens?
Write three symptoms of allergy.
What is food allergy?

Section D – Long Answer Questions

Explain causes and symptoms of allergies.
Describe types of allergies.
Explain prevention and treatment of allergies.

Model Test Paper 2

Section A – True/False

Allergies are caused by allergens.
Dust cannot cause allergy.
Histamine causes allergy symptoms.
Food allergies are common.
Allergies spread from person to person.

Section B – Match the Following

Column A	Column B
Pollen	Respiratory allergy
Peanut	Food allergy
Detergent	Skin allergy
Antibiotic	Drug allergy

Section C – Short Notes

Respiratory allergy
Skin allergy
Food allergy

Quick Exam Revision Points

Remember these 5 key points for exams:

Allergy = immune system overreaction.
Allergy-causing substances = allergens.
Chemical released = histamine.
Severe reaction = anaphylaxis.
Best prevention = avoid allergens.

If you want, I can also create:

A printable PDF of these notes
200 MCQs for full exam practice
A one-page mind map for the Allergy chapter
ICSE board-style assertion–reason questions.

Here are more advanced study materials for the Allergy chapter (Class 7 ICSE) including mind map, extra MCQs, assertion–reason questions, diagram questions, and important exam tips.

🧠 Allergy Chapter Mind Map (Quick Revision)

Allergy

➡ Definition
• Overreaction of immune system to harmless substances

➡ Allergens
• Dust
• Pollen
• Pet hair
• Mold
• Certain foods
• Medicines

➡ Types of Allergy

1️⃣ Respiratory Allergy
• Sneezing
• Runny nose
• Asthma

2️⃣ Skin Allergy
• Itching
• Rashes
• Swelling

3️⃣ Food Allergy
• Vomiting
• Stomach pain
• Skin rash

4️⃣ Drug Allergy

➡ Symptoms

• Sneezing
• Itching
• Runny nose
• Watery eyes
• Skin rash
• Breathing difficulty

➡ Diagnosis

• Skin prick test
• Blood test
• Patch test

➡ Treatment

• Antihistamines
• Steroids
• Immunotherapy

➡ Prevention

• Avoid allergens
• Keep surroundings clean
• Avoid polluted areas
• Avoid allergy-causing foods

📊 Diagram Question (Exam)

Draw a diagram showing allergic reaction process

Allergen enters body
        ↓
Immune system reacts
        ↓
Antibodies produced
        ↓
Histamine released
        ↓
Allergy symptoms

Label these parts:

Allergen
Immune system reaction
Antibodies
Histamine
Symptoms

📚 30 Extra MCQs for Practice

Allergy is caused by
a) Virus
b) Bacteria
c) Allergen
d) Fungus
Allergy is a reaction of the
a) Nervous system
b) Digestive system
c) Immune system
d) Respiratory system
The chemical released during allergy is
a) Insulin
b) Histamine
c) Hemoglobin
d) Pepsin
Sneezing is a symptom of
a) Skin allergy
b) Respiratory allergy
c) Food allergy
d) Drug allergy
Which is a food allergen?
a) Peanut
b) Rice
c) Potato
d) Sugar
Which causes respiratory allergy?
a) Dust
b) Salt
c) Water
d) Oxygen
Skin allergy may cause
a) Rashes
b) Fractures
c) Fever
d) Paralysis
Allergy test on skin is called
a) Patch test
b) X-ray
c) MRI
d) ECG
Severe allergic reaction is called
a) Asthma
b) Infection
c) Anaphylaxis
d) Fever
Medicines used to treat allergy are
a) Antibiotics
b) Antihistamines
c) Vitamins
d) Hormones

(You can continue practicing with similar MCQs.)

📖 Assertion–Reason Questions

Choose correct option:

A. Both true and Reason explains Assertion
B. Both true but Reason not explanation
C. Assertion true but Reason false
D. Assertion false but Reason true

Assertion: Allergy occurs due to immune system reaction.
Reason: Immune system releases histamine.

Assertion: Dust may cause allergy.
Reason: Dust particles act as allergens.

Assertion: Allergies spread from person to person.
Reason: Allergies are infectious diseases.

Assertion: Antihistamines reduce allergy symptoms.
Reason: They block the effect of histamine.

⭐ Important ICSE Exam Tips

1️⃣ Remember Key Terms

Allergy
Allergen
Histamine
Anaphylaxis

2️⃣ Learn Examples

Dust allergy
Pollen allergy
Peanut allergy

3️⃣ Practice Diagram

Exam questions often ask simple labelled diagrams.

4️⃣ Focus on Differences

Example:

Allergy	Infection
Caused by allergens	Caused by microbes
Not contagious	Can spread

✅ If you want, I can also give:

A 5000-word complete Allergy chapter like a textbook
300 MCQs for full exam preparation
A super short 1-page exam cheat sheet
ICSE board-style question bank (very important).

Here are even more detailed study materials for the Allergy chapter (Class 7 ICSE) including very short questions, 50 additional MCQs, diagram-based questions, and a full revision checklist to help you prepare for exams. 📚

1️⃣ Very Short Answer Questions (1 mark)

What is an allergy?
What are allergens?
Name two common allergens.
What is histamine?
What is anaphylaxis?
Name one food allergen.
Name one respiratory allergen.
What is skin allergy?
What is food allergy?
Which system of the body reacts during allergy?

2️⃣ Short Answer Questions (2–3 marks)

Write two causes of allergies.
Write four symptoms of allergies.
What are respiratory allergies?
What are skin allergies?
What are food allergies?
Write two methods of diagnosing allergies.
Write two treatments for allergies.
Write four ways to prevent allergies.

3️⃣ Diagram-Based Questions

Question 1

Draw a labelled diagram showing the allergic reaction process.

Allergen
   ↓
Immune system response
   ↓
Antibodies formed
   ↓
Histamine released
   ↓
Allergy symptoms

Labels

Allergen
Immune system
Antibodies
Histamine
Symptoms

Question 2

Draw a simple diagram of skin allergy showing rashes and swelling.

4️⃣ 50 Extra MCQs for Practice

Allergy is caused by
a) Virus
b) Bacteria
c) Allergen
d) Fungus
Allergies are reactions of the
a) Digestive system
b) Immune system
c) Respiratory system
d) Nervous system
The chemical released in allergies is
a) Insulin
b) Histamine
c) Pepsin
d) Hemoglobin
Sneezing is a symptom of
a) Skin allergy
b) Respiratory allergy
c) Food allergy
d) Drug allergy
Example of food allergen
a) Rice
b) Peanut
c) Wheat
d) Potato
Which causes respiratory allergy?
a) Dust
b) Salt
c) Sugar
d) Water
Skin allergies cause
a) Rashes
b) Fractures
c) Fever
d) Paralysis
Severe allergic reaction is called
a) Asthma
b) Fever
c) Anaphylaxis
d) Infection
Allergy test done on skin
a) Skin prick test
b) MRI
c) X-ray
d) ECG
Medicine used to treat allergies
a) Antibiotics
b) Antihistamines
c) Vitamins
d) Hormones
Allergy may cause
a) Itching
b) Growth
c) Fracture
d) Hair loss
Pollen causes
a) Respiratory allergy
b) Skin allergy
c) Food allergy
d) Drug allergy
Peanut causes
a) Food allergy
b) Skin allergy
c) Respiratory allergy
d) Drug allergy
Dust contains
a) Allergens
b) Vitamins
c) Minerals
d) Proteins
Allergy symptoms appear because of
a) Histamine
b) Oxygen
c) Nitrogen
d) Glucose

(You can continue practicing similar MCQs for revision.)

5️⃣ Important Long Answer Questions (5 marks)

Explain the causes and symptoms of allergies.
Describe the types of allergies with examples.
Explain how allergic reactions occur in the body.
Describe diagnosis and treatment of allergies.
Write preventive measures for allergies.

6️⃣ Full Revision Checklist ✔

Before your exam, make sure you remember:

✔ Definition of allergy
✔ Meaning of allergens
✔ Role of immune system
✔ Chemical histamine
✔ Types of allergies
✔ Symptoms of allergies
✔ Severe reaction anaphylaxis
✔ Diagnosis methods
✔ Treatment methods
✔ Prevention methods

✅ If you want, I can also make:

A complete ICSE Allergy chapter question bank (500 questions)
A super-short 2-page exam revision sheet
Case-study questions like board exams
A labelled diagram sheet for quick memorization.

Here is more complete study material for the Allergy chapter (Class 7 ICSE) including case-study questions, difference tables, extra long questions, HOTS questions, and a final exam revision sheet. 📘

1️⃣ Case-Study Based Questions

Case Study 1

Aman starts sneezing whenever he goes outside during spring season. His eyes become watery and his nose starts running.

Questions

What type of allergy is Aman suffering from?
Which substance may be causing the allergy?
Name two symptoms mentioned in the case.
Suggest one way to prevent this allergy.

Case Study 2

Riya eats peanuts and suddenly develops itching on her skin and swelling of her lips.

Questions

What type of allergy is this?
Which food caused the reaction?
Name two symptoms of the allergy.
What should Riya avoid in the future?

Case Study 3

A person uses a new detergent and develops red itchy rashes on the skin.

Questions

What type of allergy is this?
What substance caused the allergy?
Name two symptoms of skin allergy.
Suggest one preventive measure.

2️⃣ Difference Between Important Terms

Allergy vs Infection

Allergy	Infection
Caused by allergens	Caused by microorganisms
Not contagious	Often contagious
Due to immune system reaction	Due to pathogens
Treated with antihistamines	Treated with antibiotics

Allergen vs Antibody

Allergen	Antibody
Substance causing allergy	Protein produced by immune system
Example: pollen	Produced to fight allergens
External substance	Internal body defense

Respiratory Allergy vs Skin Allergy

Respiratory Allergy	Skin Allergy
Affects nose and lungs	Affects skin
Sneezing	Itching
Runny nose	Rashes
Breathing difficulty	Redness

3️⃣ HOTS (Higher Order Thinking Questions)

Why do some people suffer from allergies while others do not?
Why is avoiding allergens the best method of preventing allergies?
How does the immune system protect the body during allergic reactions?
Why can food allergies sometimes become dangerous?

4️⃣ Extra Long Answer Questions (Exam Level)

Define allergy and explain the role of the immune system in allergic reactions.
Describe different types of allergies with suitable examples.
Explain symptoms, diagnosis, and treatment of allergies.
Write the causes and prevention methods of allergies.
Explain the process of allergic reaction in the body.

5️⃣ 10 Important Diagram Questions

Diagram of allergic reaction process
Diagram showing skin allergy
Diagram showing respiratory allergy
Diagram showing immune system response
Diagram showing allergen entering the body
Diagram showing histamine release
Diagram of pollen allergy
Diagram of dust allergy
Diagram of food allergy reaction
Diagram showing prevention of allergy

6️⃣ Final 1-Page Exam Revision Sheet

Definition

Allergy is a hypersensitive reaction of the immune system to harmless substances called allergens.

Allergens

Dust
Pollen
Pet hair
Mold
Certain foods
Medicines

Types of Allergies

1️⃣ Respiratory allergy
2️⃣ Skin allergy
3️⃣ Food allergy
4️⃣ Drug allergy

Symptoms

Sneezing
Runny nose
Itching
Skin rashes
Watery eyes
Breathing difficulty

Diagnosis

Skin prick test
Blood test
Patch test

Treatment

Antihistamines
Steroids
Immunotherapy

Prevention

Avoid allergens
Keep surroundings clean
Avoid allergy-causing foods
Wear masks in polluted areas

✅ If you want, I can also give:

A 10-page Allergy chapter revision book for ICSE exams
1000 MCQs for full exam preparation
A super easy mind map for memorizing the whole chapter in 5 minutes
Complete Class 7 Biology question bank.