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By Karan Singh Bisht
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Updated on 22 Jul 2026, 14:09 IST
Important Questions Class 8 Science Chapter 3 Health: The Ultimate Treasure are prepared by Infinity Learn to help students revise the chapter in a simple, organized, and exam-focused way for the 2026-27 academic session. This important questions is written for Class 8 students who want clear Health: The Ultimate Treasure question answers, quick revision support, and important practice questions before school tests and exams.
The questions are prepared based on the latest NCERT Class 8 Science Curiosity textbook and the important concepts covered in Chapter 3. The chapter explains the meaning of health, physical, mental, and social well-being, healthy habits, communicable and non-communicable diseases, symptoms, signs, immunity, vaccination, antibiotics, sanitation, and disease prevention. Each answer is written in student-friendly language so that learners can understand the concept clearly and write better answers in exams.
These Class 8 Science Chapter 3 Health: The Ultimate Treasure important questions include MCQs, short answer questions, long answer questions, fill in the blanks, assertion-reason questions, and case-based questions. They are designed to help students practice different types of questions and revise the chapter without confusion.
This resource is useful for Class 8 students, teachers, and parents. Students can use it for homework, class tests, annual exam preparation, and last-minute revision. Teachers can use these questions for classroom practice, while parents can use them to support children during self-study.
Students can download the Class 8 Science Chapter 3 Important Questions PDF from Infinity Learn for offline practice. The PDF helps students revise important concepts, practice answers, and prepare confidently for the 2026-27 exams.
1. What is health?
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Answer: Health is a state of complete physical, mental, and social well-being. It does not only mean the absence of disease.
2. What are the three main aspects of health?
Answer: The three main aspects of health are physical health, mental health, and social health.
3. Why is health more than just not falling sick?
Answer: Health is more than just not falling sick because a healthy person should feel good physically, stay mentally positive, and have healthy relationships with others.
4. What are symptoms?
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Answer: Symptoms are the problems that a person feels when they are unwell, such as pain, tiredness, dizziness, or weakness.
5. What are signs of disease?
Answer: Signs are changes that can be seen or measured, such as fever, rash, swelling, or high blood pressure.
6. What is a disease?
Answer: A disease is a condition that affects the normal working of the body or mind.
7. What are pathogens?
Answer: Pathogens are disease-causing organisms such as bacteria, viruses, fungi, worms, and protozoa.
8. What are communicable diseases?
Answer: Communicable diseases are diseases caused by pathogens that can spread from one person to another.
9. Give two examples of communicable diseases.
Answer: Two examples of communicable diseases are flu and chickenpox.
10. What are non-communicable diseases?
Answer: Non-communicable diseases are diseases that do not spread from one person to another. They are usually linked to lifestyle, diet, or environment.
Also Read: Health: The Ultimate Treasure Class 8 MCQs
11. Explain the meaning of health according to the World Health Organization.
Answer: According to the World Health Organization, health means complete physical, mental, and social well-being, and not only the absence of disease. A healthy person can work efficiently, manage difficult situations, adjust with others, and maintain a positive lifestyle.
12. How did the boy’s habits and surroundings affect his health in Activity 3.1?
Answer: The boy moved to a new school in another city and had no friends. His parents were busy, so he felt lonely. To cope with loneliness, he spent more time on his phone and social media. This made him feel worse. He stopped making friends, had headaches, lost weight, and could not sleep well. His habits and surroundings affected his mental, social, and physical well-being.
13. What healthy habits should students follow?
Answer: Students should eat a balanced diet, maintain personal hygiene, exercise regularly, sleep well, limit screen time, spend time with family and friends, practise yoga or breathing exercises, and stay away from harmful substances like tobacco, alcohol, and addictive drugs.
14. Why should we keep our surroundings clean?
Answer: We should keep our surroundings clean because dirty and polluted places can attract flies, mosquitoes, and other disease-spreading organisms. Clean surroundings protect us from germs and help us stay healthy.
15. What is the difference between communicable and non-communicable diseases?
Answer: Communicable diseases are caused by pathogens and can spread from one person to another. Examples include typhoid, dengue, flu, chickenpox, and COVID-19. Non-communicable diseases do not spread from person to person and are usually linked to lifestyle, diet, or environment. Examples include diabetes, cancer, and asthma.
16. How do communicable diseases spread?
Answer: Communicable diseases can spread through air, direct contact, indirect contact, contaminated food and water, infected personal items, insects such as mosquitoes and houseflies, and bites from infected animals.
17. How can we prevent communicable diseases?
Answer: We can prevent communicable diseases by washing hands regularly, covering the mouth and nose while coughing or sneezing, wearing masks in crowded places, not sharing personal items, keeping food and water clean, maintaining hygiene, and staying at home when unwell.
18. What are deficiency diseases?
Answer: Deficiency diseases are diseases caused by a lack of specific nutrients in the diet. Examples include scurvy, anaemia, and goitre. These diseases are non-communicable because they do not spread from one person to another.
19. What is immunity?
Answer: Immunity is the natural ability of the body to fight diseases. The immune system protects the body from harmful pathogens and helps us recover from infections.
20. Why are vaccines important?
Answer: Vaccines are important because they train the immune system to recognize and fight harmful germs. They help prevent serious infections caused by viruses and bacteria and reduce the spread of diseases.
21. Health includes which of the following?
Answer: D. Physical, mental, and social well-being
22. A symptom is something that:
Answer: B. A person feels when unwell
23. Which of the following is a sign of disease?
Answer: C. Fever
24. Disease-causing organisms are called:
Answer: B. Pathogens
25. Which of the following is a communicable disease?
Answer: C. Flu
26. Which of the following is a non-communicable disease?
Answer: D. Diabetes
27. Malaria is caused by:
Answer: B. Protozoa
28. Dengue fever spreads through:
Answer: B. Mosquitoes
29. Antibiotics work only against:
Answer: B. Bacterial infections
30. Vaccines are mainly used to:
Answer: B. Prevent diseases
31. Health means complete physical, mental, and ______ well-being.
Answer: social
32. A disease affects the normal working of the body or ______.
Answer: mind
33. Disease-causing organisms are called ______.
Answer: pathogens
34. Communicable diseases can spread from one person to ______.
Answer: another
35. Diseases like diabetes and asthma are ______ diseases.
Answer: non-communicable
36. Insects that spread pathogens are called ______.
Answer: vectors
37. The natural ability of the body to fight diseases is called ______.
Answer: immunity
38. Vaccines train the ______ system to fight diseases.
Answer: immune
39. Antibiotics work against ______ infections.
Answer: bacterial
40. Regular handwashing helps remove ______ from our hands.
Answer: pathogens
41. Assertion (A): Health is not only the absence of disease.
Reason (R): Health includes physical, mental, and social well-being.
A. Both A and R are true, and R explains A
B. Both A and R are true, but R does not explain A
C. A is true, but R is false
D. A is false, but R is true
Answer: A. Both A and R are true, and R explains A.
42. Assertion (A): Communicable diseases can spread from one person to another.
Reason (R): They are caused by pathogens.
A. Both A and R are true, and R explains A
B. Both A and R are true, but R does not explain A
C. A is true, but R is false
D. A is false, but R is true
Answer: A. Both A and R are true, and R explains A.
43. Assertion (A): Diabetes is a communicable disease.
Reason (R): It spreads from one person to another through air.
A. Both A and R are true
B. Both A and R are false
C. A is true, but R is false
D. A is false, but R is true
Answer: B. Both A and R are false.
44. Assertion (A): Mosquitoes can spread diseases like malaria and dengue.
Reason (R): Mosquitoes act as vectors.
A. Both A and R are true, and R explains A
B. Both A and R are true, but R does not explain A
C. A is true, but R is false
D. A is false, but R is true
Answer: A. Both A and R are true, and R explains A.
45. Assertion (A): Vaccines help prevent diseases.
Reason (R): Vaccines train the immune system to recognize harmful germs.
A. Both A and R are true, and R explains A
B. Both A and R are true, but R does not explain A
C. A is true, but R is false
D. A is false, but R is true
Answer: A. Both A and R are true, and R explains A.
46. Assertion (A): Antibiotics should be used only when prescribed by a doctor.
Reason (R): Unnecessary use of antibiotics can lead to antibiotic resistance.
A. Both A and R are true, and R explains A
B. Both A and R are true, but R does not explain A
C. A is true, but R is false
D. A is false, but R is true
Answer: A. Both A and R are true, and R explains A.
47. Assertion (A): Clean surroundings help us stay healthy.
Reason (R): Dirty places may attract flies and mosquitoes.
A. Both A and R are true, and R explains A
B. Both A and R are true, but R does not explain A
C. A is true, but R is false
D. A is false, but R is true
Answer: A. Both A and R are true, and R explains A.
48. Assertion (A): Chickenpox is a communicable disease.
Reason (R): It is caused by a virus and can spread from an infected person.
A. Both A and R are true, and R explains A
B. Both A and R are true, but R does not explain A
C. A is true, but R is false
D. A is false, but R is true
Answer: A. Both A and R are true, and R explains A.
49. Assertion (A): Deficiency diseases are caused by a lack of nutrients.
Reason (R): Scurvy, anaemia, and goitre are examples of such diseases.
A. Both A and R are true, and R explains A
B. Both A and R are true, but R does not explain A
C. A is true, but R is false
D. A is false, but R is true
Answer: A. Both A and R are true, and R explains A.
50. Assertion (A): Vaccines are curative medicines.
Reason (R): They are taken after a person becomes sick to cure the disease.
A. Both A and R are true
B. Both A and R are false
C. A is true, but R is false
D. A is false, but R is true
Answer: B. Both A and R are false.
51. A student spends too much time on social media, feels lonely, and cannot sleep well. Which aspects of health are affected?
Answer: The student’s mental, social, and physical health are affected. Loneliness affects social health, stress affects mental health, and lack of sleep affects physical health.
52. A playground is dirty, polluted, and full of flies and mosquitoes. Why is it unsafe?
Answer: It is unsafe because flies and mosquitoes can spread diseases. Dirty surroundings can expose children to germs and make them fall sick.
53. A person has pain, tiredness, and dizziness. Are these signs or symptoms?
Answer: These are symptoms because they are felt by the person who is unwell.
54. A patient has fever and rash. Are these signs or symptoms?
Answer: These are signs because they can be seen or measured.
55. A school has a flu outbreak. What should students do to prevent further spread?
Answer: Students should wash hands regularly, wear masks if needed, cover their mouth and nose while coughing or sneezing, avoid close contact, and stay at home if unwell.
56. A family is travelling to a malaria-prone area. What precautions should they take?
Answer: They should use mosquito nets and repellents, wear long-sleeved clothes, avoid mosquito bites, and follow health advice before and after travel.
57. A child drinks contaminated water and falls sick with diarrhoea. Which type of disease spread is this?
Answer: This is spread through contaminated water. Diseases like cholera, typhoid, and Hepatitis A can spread in this way.
58. A person takes antibiotics for a viral cold. Is this correct?
Answer: No, this is not correct. Antibiotics work only against bacterial infections. They do not work against viral infections like cold or flu.
59. A community builds toilets and reduces open defecation. How does this help health?
Answer: It improves sanitation and reduces the spread of communicable diseases. Clean surroundings and proper toilet use help prevent infections such as diarrhoea.
60. A person takes an incomplete dose of antibiotics. What problem can this cause?
Answer: Taking an incomplete dose of antibiotics can lead to antibiotic resistance. Some bacteria may survive and become harder to treat later.
61. What are the causes of non-communicable diseases?
Answer: Non-communicable diseases are usually caused by lifestyle, diet, and environmental factors. Lack of exercise, unhealthy eating habits, obesity, pollution, stress, and poor sleep may increase the risk of such diseases.
62. Why are diabetes and heart diseases becoming more common?
Answer: Diabetes and heart diseases are becoming more common because of unhealthy lifestyle habits such as eating processed food, lack of physical activity, stress, obesity, and longer life expectancy.
63. What is antibiotic resistance?
Answer: Antibiotic resistance is a condition in which bacteria that were earlier killed by an antibiotic survive and multiply despite treatment. This makes infections harder to treat.
64. How can antibiotic resistance be reduced?
Answer: Antibiotic resistance can be reduced by using antibiotics only when prescribed by a doctor, taking the correct dose, completing the full course, and avoiding unnecessary use.
65. Who discovered the first vaccine?
Answer: Edward Jenner discovered the first vaccine. He found that people who had cowpox did not get smallpox, which led to the development of the smallpox vaccine.
66. Who discovered penicillin?
Answer: Penicillin was discovered by Alexander Fleming in 1928. He observed that a mould stopped harmful bacteria from growing.
67. What is the role of the immune system?
Answer: The immune system protects the body from harmful pathogens. It helps the body fight diseases and supports recovery from infections.
68. What happens when the body meets the same pathogen again?
Answer: When the body meets the same pathogen again, the immune response is faster and stronger because memory cells recognise the pathogen and help the body fight it more effectively.
69. Why should students maintain a health diary?
Answer:
A health diary helps students track food, hygiene, exercise, sleep, screen time, and emotional state. It helps them understand their habits and improve their overall health.
70. What is the main message of Chapter 3: Health – The Ultimate Treasure?
Answer: The main message of the chapter is that health is a complete state of physical, mental, and social well-being. To stay healthy, we should follow good habits, maintain hygiene, keep our surroundings clean, prevent diseases, use medicines responsibly, and take care of our mind and body.
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Students can get Health: The Ultimate Treasure Class 8 Questions and Answers on Infinity Learn. These questions are written in simple language and help students revise important topics such as health, hygiene, diseases, immunity, vaccination, antibiotics, and prevention.
Yes, students can download the Health the ultimate treasure class 8 important question answer PDF from Infinity Learn for offline study. The PDF is useful for quick revision, homework practice, class tests, and annual exam preparation.
Yes, the Class 8 Science Chapter 3 important question answer PDF CBSE is useful for exams because it includes exam-focused questions with clear answers. It helps students practice MCQs, short answers, long answers, assertion-reason questions, and case-based questions
Class 8 science chapter 3 question answer PDF includes important questions and answers from Health: The Ultimate Treasure. It covers physical, mental, and social health, communicable and non-communicable diseases, symptoms, signs, sanitation, immunity, vaccines, and antibiotics.
Students should practice Class 8 Science Chapter 3 Important Questions to understand key concepts clearly and prepare better for exams. These questions help improve answer writing, strengthen revision, and build confidence before school tests.
Students can choose Infinity Learn because the answers are written in a student-friendly and syllabus-based format. The important questions help learners revise Chapter 3 easily and understand how to write accurate answers in exams.