Chapter 6 of 19

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Tamil Nadu (TNBSE)Class 7 Science★ 6-10 marks in the TN Class 7 Term 1 exam through book-back MCQs, analogies, true/false and short answers

Health and Hygiene

Samacheer Kalvi (TN State Board) Class 7 Science — Term 1 Chapter 6, Health and Hygiene. The meaning of health, communicable and non-communicable diseases (bacterial, viral and water/air-borne), the harms of tobacco, types of burns, and the importance of cleanliness and good habits, with the actual book-back questions, common mistakes and quick revision.

⏱ 15 min readEasy difficulty✓ Free · NCERT-aligned

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Study Guide

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Key points, glossary and the questions most likely to show up.

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By the end of this chapter you'll be able to…

1Define health and good hygiene
2Differentiate communicable and non-communicable diseases
3Classify diseases as bacterial or viral
4Explain the harms of tobacco
5Describe first- and second-degree burns

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Why this chapter matters

Health and Hygiene teaches how diseases spread and how to stay healthy — vital life knowledge. Communicable vs non-communicable diseases, bacterial vs viral, and the harms of tobacco are directly tested book-back content in the TN Class 7 Term 1 exam.

Before you start — revise these

A 5-minute refresher here will save you 30 minutes of confusion below.

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Class 6 — Health

Food and cleanliness.

Health and Hygiene — Class 7 Science (Samacheer Kalvi)

TN State Board (Samacheer Kalvi) Class 7 Science, Term 1 — Chapter 6. Staying healthy and disease-free.

1. About this chapter

This chapter covers health, communicable and non-communicable diseases, the harms of tobacco, types of burns, and hygiene and good habits.

2. Health and hygiene

Health means having a sound mind and a physically fit body. Sleep is good not only for the body but also for the mind.
Our living place should be clean, and all food should be kept covered to prevent contamination.

3. Communicable and non-communicable diseases

Communicable diseases spread from person to person. They are caused by:
- bacteria — e.g. typhoid, tuberculosis, cholera,
- viruses — e.g. hepatitis, chicken pox (varicella), rabies.
They spread through air (tuberculosis) or water (cholera), among other ways.
Non-communicable diseases do not spread between people — e.g. a stomach ulcer.
Rabies is a fatal disease; chicken pox is a viral, communicable disease with rashes, fever, headache and tiredness.

4. Tobacco and burns

Chewing tobacco causes periodontitis (gum disease) and other serious harms.
Burns: a first-degree burn affects the epidermis (outer skin), while a second-degree burn reaches the dermis (deeper skin).

5. Worked examples

Example 1. Which disease is caused by a virus — typhoid or hepatitis? Hepatitis (typhoid is bacterial).

Example 2. Which disease spreads through water? Cholera.

Example 3. What does chewing tobacco cause? Periodontitis (gum disease).

6. Book-back questions (Samacheer Kalvi)

I. Choose the correct answer

A sound mind and physically fit body refers to — (a) wealth / (b) health. Ans: (b) health.
Sleep is good for the body and also for the — (a) hair / (b) mind. Ans: (b) mind.
Our living place should be — (a) dark / (b) clean. Ans: (b) clean.
Chewing tobacco causes — (a) good teeth / (b) periodontitis. Ans: (b) periodontitis.

II. Analogy (fill in) 5. First-degree burn : epidermis :: second-degree burn : dermis. 6. Typhoid : bacteria :: hepatitis : virus. 7. Tuberculosis : air :: cholera : water.

III. True or False 8. All food should be covered. — True. 9. Stomach ulcer is a non-communicable disease. — True. 10. Rabies is a fatal disease. — True. 11. Chicken pox is also known as leucoderma. — False (it is also known as varicella).

7. Common mistakes

Mistake: Calling chicken pox "leucoderma". Fix: Chicken pox is also called varicella.
Mistake: Thinking all diseases are communicable. Fix: Some are non-communicable (e.g. stomach ulcer) and do not spread.
Mistake: Mixing up bacterial and viral diseases. Fix: Typhoid, TB, cholera = bacterial; hepatitis, chicken pox, rabies = viral.

8. Quick revision

Term 1 · Ch 6 · health and hygiene.
Health = sound mind + fit body; sleep good for the mind; keep the home clean and food covered.
Communicable: bacterial (typhoid, TB, cholera) and viral (hepatitis, chicken pox = varicella, rabies); spread by air (TB) and water (cholera). Non-communicable: stomach ulcer.
Tobacco chewing → periodontitis; first-degree burn = epidermis, second-degree = dermis; rabies is fatal.

Key formulas & results

Everything you need to memorise, in one card. Screenshot this for revision.

Health

sound mind + physically fit body

Sleep helps the mind.

Bacterial diseases

typhoid, tuberculosis, cholera

TB = air, cholera = water.

Viral diseases

hepatitis, chicken pox (varicella), rabies

Rabies is fatal.

Burns

first-degree = epidermis; second-degree = dermis

By depth of skin.

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Common mistakes & fixes

These are the exact errors that cost students marks in board exams. Read them once, save yourself the trouble.

WATCH OUT

✗ Calling chicken pox 'leucoderma'

✓ Chicken pox is also called varicella.

WATCH OUT

✗ Thinking all diseases are communicable

✓ Some are non-communicable (e.g. stomach ulcer) and do not spread.

WATCH OUT

✗ Mixing up bacterial and viral diseases

✓ Typhoid, TB and cholera are bacterial; hepatitis, chicken pox and rabies are viral.

NCERT exercises (with solutions)

Every NCERT exercise from this chapter — what it covers and how many questions to expect.

Choose the correct answer

Book-back MCQs on health, sleep, cleanliness and tobacco.

Questions

Analogies

Burns, disease causes and modes of spread.

Questions

True or False

Food, non-communicable disease, rabies and chicken pox.

Questions

Practice problems

Try each one yourself before tapping "Show solution". Active recall > rereading.

Q1EASY· MCQ

A sound mind and a physically fit body refers to ____.

▶ Show solution

health.

Q2EASY· MCQ

Chewing tobacco causes ____.

▶ Show solution

periodontitis (gum disease).

Q3EASY· Analogy

Typhoid : bacteria :: hepatitis : ____.

▶ Show solution

virus.

Q4EASY· Analogy

Tuberculosis : air :: cholera : ____.

▶ Show solution

water.

Q5EASY· True/False

True or False: Stomach ulcer is a non-communicable disease.

▶ Show solution

True.

Q6MEDIUM· Answer briefly

Differentiate first-degree and second-degree burns.

▶ Show solution

A first-degree burn affects only the outer skin (epidermis), while a second-degree burn reaches the deeper layer (dermis).

5-minute revision

The whole chapter, distilled. Read this the night before the exam.

•Term 1 Chapter 6 of Samacheer Kalvi Class 7 Science.
•Health = sound mind and physically fit body; sleep helps the mind; keep the home clean and food covered.
•Bacterial diseases: typhoid, tuberculosis (air-borne), cholera (water-borne).
•Viral diseases: hepatitis, chicken pox (varicella), rabies (fatal).
•Non-communicable diseases (e.g. stomach ulcer) do not spread between people.
•Tobacco chewing causes periodontitis; first-degree burn = epidermis, second-degree = dermis.

Tamil Nadu (TNBSE) marks blueprint

Where the marks come from in this chapter — so you can plan your prep.

Typical chapter weightage: 6-10 marks across book-back MCQ, analogies, true/false and short answers

Question type	Marks each	Typical count	What it tests
MCQ	1	3-4	Health, cleanliness, tobacco
Analogy / True-False	1	3-4	Disease causes and spread
Short Answer	2	1-2	Burns, disease types

Prep strategy

Group diseases as bacterial or viral
Note the mode of spread (air/water)
Remember tobacco causes periodontitis
Separate first- and second-degree burns

Where this shows up in the real world

This chapter isn't just an exam topic — it lives in the world around you.

Disease prevention

Hygiene habits stop the spread of infections.

First aid

Knowing burn types helps in treating injuries.

Healthy living

Good sleep, diet and cleanliness keep us fit.

Exam strategy

Battle-tested tips from teachers and toppers for this chapter.

Classify each disease as bacterial or viral
State the mode of spread (air/water)
Quote periodontitis for tobacco
Match burn degree to skin layer

Going beyond the textbook

For olympiad aspirants and curious learners — topics that build on this chapter.

List three habits that prevent communicable diseases in a community.
Explain how vaccination protects against viral diseases.

Where else this chapter is tested

CBSE board isn't the only one — other exams test this chapter too.

TN Class 7 Term 1 ExamHigh

NMMS / Foundation ScienceMedium

School unit testsHigh

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Questions students ask

The real ones — pulled from the Q&A community and tutor sessions.

Communicable diseases spread from one person to another (through air, water or contact), like cholera and chicken pox, while non-communicable diseases such as a stomach ulcer do not spread between people.

Uncovered food can be contaminated by flies, dust and germs, which cause diseases like cholera and typhoid; covering food keeps it clean and safe to eat.

Practice more, ask doubts, find a tutor

Tamil Nadu (TNBSE) Class 7 mock tests

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Science flashcards

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