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Important Questions Chapter 3 Class 8 Science Curiosity CBSE Board

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Health: The Ultimate Treasure


Short Questions

1. What is health according to WHO?
Answer: Health is complete physical, mental, and social well-being, not just the absence of disease.

2. What is a communicable disease?
Answer: A disease caused by pathogens like bacteria or viruses that can spread.

3.Name one non-communicable disease.
Answer: Diabetes.

4.How do pathogens spread?
Answer: Through air, water, food, or direct contact.

5.What is a symptom?
Answer: Something you feel, like pain or tiredness.

6.What is a sign of a disease?
Answer: Something measurable, like fever or rash.

7.What is the immune system?
Answer: The body’s system to fight diseases.

8.What does a vaccine do?
Answer: Trains the immune system to fight germs.

9.Name one way to prevent communicable diseases.
Answer: Washing hands with soap.

10.What is a vector?
Answer: An insect that spreads pathogens, like mosquitoes.

11.Why is clean air important?
Answer: It prevents breathing problems like asthma.

12.What causes non-communicable diseases?
Answer: Lifestyle, diet, or environmental factors.

13.What is antibiotic resistance?
Answer: When bacteria stop responding to antibiotics.

14.Who discovered the smallpox vaccine?
Answer: Edward Jenner.

15. What is Ayurveda?
Answer: A traditional Indian system using herbs and lifestyle for health.


Long Questions

1. Why do some people get sick more during disease outbreaks?
Answer: Some people have weaker immunity or live in crowded, unclean areas. Poor nutrition and lack of hygiene also increase risk.

2.How did the boy’s habits affect his health in Activity 3.1?
Answer: Spending too much time on his phone caused loneliness and stress. This led to headaches, weight loss, and poor sleep.

3.How can you prevent communicable diseases at home?
Answer: Wash hands, keep surroundings clean, and cover your mouth when coughing. Avoid sharing personal items like towels.

4.Why are non-communicable diseases like diabetes increasing in India?
Answer: People eat more processed food and exercise less. Longer lifespans and unhealthy lifestyles also contribute.

5.How do vaccines help protect us from diseases?
Answer: Vaccines train the immune system to recognize and fight germs. They prevent serious diseases without causing illness.

6.What is the difference between a symptom and a sign?
Answer: A symptom is what you feel, like pain or tiredness. A sign is what others can see or measure, like fever.

7.How does air pollution affect our health?
Answer: It can cause coughing, asthma, or other breathing problems. Clean air, monitored by AQI, helps us stay healthy.

8.Why should antibiotics not be used for viral infections?
Answer: Antibiotics only work on bacteria, not viruses. Using them for viral infections can lead to antibiotic resistance.

9.How did Edward Jenner’s smallpox vaccine work?
Answer: He used cowpox to protect against smallpox. This trained the immune system to fight the related smallpox virus.

10.What steps can a community take to reduce dengue cases?
Answer: Remove standing water to stop mosquito breeding. Use mosquito nets and repellents to prevent bites.

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