Which of these is NOT a good habit?

Sleeping late and skipping meals

A healthy lifestyle includes:

Regular exercise, yoga, and positive mindset

What we feel, like pain or tiredness

Things that can be seen or measured

A condition affecting normal body function

Non-communicable diseases are caused by:

Lifestyle, diet, and environment

What was Edward Jenner’s observation?

Cowpox protected against smallpox

What does the term variolation refer to?

Traditional method to prevent smallpox

Why don’t antibiotics work on viral infections?

Viruses lack bacterial cell parts

What is antibiotic resistance?

When bacteria survive antibiotics

What helps prevent antibiotic resistance?

Using antibiotics without prescription

Completing full antibiotic course

What causes the spread of antibiotic resistance?

Overuse and misuse of antibiotics

NCERT Solutions Class 8 Science - Curiosity Chapter 3 – Health: The Ultimate Treasure

Name: Health: The Ultimate Treasure – Class 8 Science - Curiosity
Uploaded: 2026-05-31
Description: Health means complete physical, mental, and social well-being— not just the absence of disease. Good hygiene, nutritious food, exercise, and a clean environment keep us healthy, while vaccines, immunity, and responsible medicine use protect us from diseases.

Class 8 Science - Curiosity

Last Updated: 31 May 2026

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Chapter Introduction

Health means complete physical, mental, and social well-being— not just the absence of disease. Good hygiene, nutritious food, exercise, and a clean environment keep us healthy, while vaccines, immunity, and responsible medicine use protect us from diseases.

हिंदी में (Hindi)

स्वास्थ्य का अर्थ केवल बीमारी न होना नहीं, बल्कि शारीरिक, मानसिक और सामाजिक रूप से स्वस्थ रहना है। स्वच्छता, पौष्टिक भोजन, व्यायाम और स्वच्छ वातावरण हमें स्वस्थ रखते हैं, जबकि टीकाकरण, रोग प्रतिरोधक शक्ति और दवाओं का सही उपयोग हमें बीमारियों से बचाते हैं।

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Important Points

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Practice MCQ Questions (60 questions)

Q1. What does health mean according to WHO?

Q2. Which of these is a sign of good health?

Q3. What made the boy in Activity 3.1 unhealthy?

Q4. Which system of medicine teaches balance of body, mind, and surroundings?

Q5. Following dinacharya means following:

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Tough Words (Glossary)

Well-being

Meaning: A state of being healthy and happy

अर्थ: कल्याण/सुख-समृद्धि

"Mental well-being is as important as physical health."

Counsellor

Meaning: A trained person who gives guidance

अर्थ: परामर्शदाता

"The school counsellor helped the student make friends."

Loneliness

Meaning: Feeling alone and without support

अर्थ: एकाकीपन/अकेलापन

"Loneliness can harm mental health."

Lifestyle

Meaning: The way a person lives daily life

अर्थ: जीवनशैली

"An active lifestyle keeps you fit."

Hygiene

Meaning: Practices that keep you clean and healthy

अर्थ: स्वच्छता

"Hand hygiene prevents infections."

Balanced diet

Meaning: Food with right amounts of all nutrients

अर्थ: संतुलित आहार

"A balanced diet includes fruits and vegetables."

Screen time

Meaning: Time spent using phones, TV, etc.

अर्थ: स्क्रीन समय

"Limit screen time before bed."

WHO (World Health Organization)

Meaning: UN agency for world health

अर्थ: विश्व स्वास्थ्य संगठन

"WHO defines health as complete well-being."

Immunity

Meaning: Body’s ability to fight diseases

अर्थ: प्रतिरक्षा

"Good sleep improves immunity."

Immune system

Meaning: Body system that fights germs

अर्थ: प्रतिरक्षा तंत्र

"Vaccines train the immune system."

Vaccine

Meaning: A substance that prevents a disease

अर्थ: टीका

"The vaccine protects against measles."

Pathogen

Meaning: A germ that causes disease

अर्थ: रोगजनक

"Boiling water kills many pathogens."

Communicable

Meaning: Able to spread from person to person

अर्थ: संचारी/संसर्गजन्य

"Flu is a communicable disease."

Non-communicable

Meaning: Not spread from person to person

अर्थ: असंचारी

"Diabetes is a non-communicable disease."

Vector

Meaning: An insect that carries germs to humans

अर्थ: वाहक

"Mosquitoes are vectors of dengue."

Symptom

Meaning: A feeling noticed by the patient

अर्थ: लक्षण

"Headache is a symptom of stress."

Sign

Meaning: A change that can be seen or measured

अर्थ: निदर्श/चिन्ह

"Fever is a sign measured by a thermometer."

Deficiency disease

Meaning: Illness due to lack of a nutrient

अर्थ: अपूरणजनित रोग

"Scurvy is a deficiency disease of vitamin C."

Chronic

Meaning: Lasting for a long time

अर्थ: दीर्घकालिक

"Asthma is a chronic condition."

Obesity

Meaning: Too much body fat

अर्थ: मोटापा

"Obesity increases risk of diabetes."

Processed food

Meaning: Factory-made, often with additives

अर्थ: प्रसंस्कृत भोजन

"Limit processed food to stay healthy."

Addiction

Meaning: Not being able to stop a harmful habit

अर्थ: लत/आसक्ति

"Phone addiction affects sleep."

Meditation

Meaning: Practice of calming the mind

अर्थ: ध्यान

"Meditation reduces stress."

Mindfulness

Meaning: Paying full attention to the present

अर्थ: सचेतता/सचेत जागरूकता

"Mindfulness helps control anxiety."

Pranayama

Meaning: Breathing exercises in yoga

अर्थ: प्राणायाम

"Do pranayama every morning."

Dinacharya

Meaning: Daily routine in Ayurveda

अर्थ: दिनचर्या (आयुर्वेद)

"Following dinacharya supports health."

Ritucharya

Meaning: Seasonal routine in Ayurveda

अर्थ: ऋतुचर्या (आयुर्वेद)

"Ritucharya guides diet with seasons."

Prakriti

Meaning: Body constitution in Ayurveda

अर्थ: प्रकृति (शारीरिक स्वभाव)

"Eat as per your prakriti."

Sanitation

Meaning: Keeping places clean to protect health

अर्थ: स्वच्छता व्यवस्था/स्वच्छता

"Good sanitation prevents diarrhoea."

AQI (Air Quality Index)

Meaning: Number showing how clean or polluted air is

अर्थ: वायु गुणवत्ता सूचकांक

"AQI above 200 is unhealthy."

Asthma

Meaning: Disease causing trouble in breathing

अर्थ: अस्थमा/दमा

"Dust can trigger asthma."

Diabetes

Meaning: Disease with high blood sugar

अर्थ: मधुमेह

"Regular exercise helps control diabetes."

Cancer

Meaning: Disease where body cells grow abnormally

अर्थ: कैंसर/अर्बुद

"Avoid tobacco to lower cancer risk."

Antibiotic

Meaning: Medicine that kills bacteria

अर्थ: प्रतिजैविक दवा

"Do not take antibiotics without prescription."

Antibiotic resistance

Meaning: When bacteria stop being killed by an antibiotic

अर्थ: प्रतिजैविक प्रतिरोध

"Overuse causes antibiotic resistance."

Diagnosis

Meaning: Finding out what disease someone has

अर्थ: रोग-निदान

"Blood tests help in diagnosis."

Therapy

Meaning: Treatment to relieve or cure illness

अर्थ: चिकित्सा/उपचार

"Physical therapy improves movement."

Prevention

Meaning: Stopping a disease before it happens

अर्थ: रोकथाम/प्रतिबंध

"Handwashing is key for prevention."

Transmission

Meaning: Passing of disease from one to another

अर्थ: संक्रमण-प्रसार/संप्रेषण

"Masks reduce virus transmission."

Vaccination

Meaning: Process of giving a vaccine

अर्थ: टीकाकरण

"Vaccination protects the community."

Rehabilitation

Meaning: Care to regain normal life after illness

अर्थ: पुनर्वास

"Rehabilitation helps after a stroke."

NCERT Solutions Class 8 Science - Curiosity Chapter 3 – Health: The Ultimate Treasure

Chapter Introduction

Watch Video Lecture

Video Coming Soon..

Important Points

Practice MCQ Questions (60 questions)

Q1. What does health mean according to WHO?

Q2. Which of these is a sign of good health?

Q3. What made the boy in Activity 3.1 unhealthy?

Q4. Which system of medicine teaches balance of body, mind, and surroundings?

Q5. Following dinacharya means following:

Q6. Which of these is NOT a good habit?

Q7. Which of these helps in maintaining good health?

Q8. Which is an unhealthy habit?

Q9. Which food habits can cause health problems?

Q10. A healthy lifestyle includes:

Q11. Why is keeping the environment clean important?

Q12. What does AQI measure?

Q13. What are symptoms?

Q14. What are signs?

Q15. What is a disease?

Q16. Diseases caused by germs are called:

Q17. Typhoid and dengue are examples of:

Q18. Which disease is NOT communicable?

Q19. What causes communicable diseases?

Q20. Diseases caused by worms are spread through:

Q21. Organisms that spread diseases are called:

Q22. Which disease spreads through mosquitoes?

Q23. Non-communicable diseases are caused by:

Q24. Which of these is a lifestyle disease?

Q25. Deficiency diseases are caused by:

Q26. Scurvy is caused by deficiency of:

Q27. Goitre is caused by lack of:

Q28. Which is a chronic disease?

Q29. What is immunity?

Q30. Vaccines provide:

Q31. Which doctor discovered the smallpox vaccine?

Q32. What was Edward Jenner’s observation?

Q33. What does the term variolation refer to?

Q34. What is the purpose of vaccination?

Q35. Vaccines are made from:

Q36. Which vaccine prevents diarrhoea in children?

Q37. Who helped develop the Rotavirus vaccine in India?

Q38. Who discovered the first antibiotic?

Q39. Penicillin was discovered from:

Q40. What are antibiotics effective against?

Q41. Why don’t antibiotics work on viral infections?

Q42. What is antibiotic resistance?

Q43. What helps prevent antibiotic resistance?

Q44. What causes the spread of antibiotic resistance?

Q45. Which system in our body fights infections?

Q46. What are communicable diseases also called?

Q47. What is the main cause of diabetes?

Q48. What type of disease is asthma?

Q49. Which campaign reduced diarrhoea in Odisha?

Q50. Who studied the link between cancer and hormones?

Q51. What is the full form of WHO?

Q52. Which practice keeps the mind calm and healthy?

Q53. Which is NOT a communicable disease?

Q54. Which habit can reduce stress?

Q55. How do worms cause disease?

Q56. Which scientist’s discovery led to saving millions from bacterial infections?

Q57. What helps us know if air is safe to breathe?

Q58. Vaccines work by training the:

Q59. Which country is one of the world’s largest vaccine producers?

Q60. ‘Prevention is better than cure’ means: