Health: The Ultimate Treasure
Class 8 Science Curiosity Chapter 3 Answers
1. Group the diseases shown in the images as communicable or non-communicable.
๐ฆ Disease Classification
๐ See Answer:
๐ด Communicable diseases (spread from one person to another):
1. ๐คง Cold and flu
2. ๐ฆ Typhoid
3. ๐ด Chickenpox
๐ข Non-communicable diseases (do not spread, caused by lifestyle, environment or body conditions):
1. ๐ฌ Diabetes
2. ๐ฌ️ Asthma
✔️ Conclusion:
๐ 3 are communicable & 2 are non-communicable
❓ 2. Diseases can be broadly grouped into communicable and non-communicable diseases. From the options given below, identify the non-communicable diseases.
(i) Typhoid (ii) Asthma (iii) Diabetes (iv) Measles
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (ii) and (iv)
๐ See Answer:
✔️ Correct answer: (b) (ii) and (iii)
๐ก Explanation:
- ๐ฆ Typhoid → Communicable (spreads through contaminated food/water)
- ๐ฌ️ Asthma → Non-communicable (allergy/respiratory issue)
- ๐ฌ Diabetes → Non-communicable (lifestyle/metabolic)
- ๐คง Measles → Communicable (spreads through air/droplets)
❓ 3. There is a flu outbreak in your school...
(i) What immediate actions should the school take to prevent further spread?
๐ See Answer:
๐ซ Immediate actions by the school:
• ๐ Tell sick students to stay at home and take rest
• ๐ท Cover mouth and nose while coughing/sneezing
• ๐งผ Provide sanitizers & ensure handwashing
• ๐ฌ️ Keep classrooms clean and ventilated
• ๐ข Inform parents and take cooperation
(ii) If your classmate... how can you respond?
๐ See Answer:
๐ค My response:
• ❌ I will not laugh or make rude comments
• ๐ฌ “You don’t look well, maybe tell the teacher and rest”
• ๐งป Offer tissue / remind politely
• ❤️ Show care without hurting feelings
(iii) How can you protect yourself and others?
๐ See Answer:
๐ก️ Protection steps:
• ๐งผ Wash hands regularly
• ๐ท Wear mask
• ๐
Avoid touching face
• ↔️ Maintain distance politely
• ๐ฅ Eat healthy + drink warm water
๐ฆ 4. Travel to Malaria-Prone Area
(i) What precautions should you take...
๐ See Answer:
๐งณ Before trip:
• ๐จ⚕️ Doctor advice
• ๐ฆ Mosquito nets & repellents
• ๐ Full-sleeved clothes
๐ During trip:
• ๐️ Use mosquito nets
• ๐งด Apply repellents
• ๐ซ Avoid water collection
• ๐ Wear full sleeves
๐ After trip:
• ๐ก️ Watch for fever/chills
• ๐ฅ Visit doctor if symptoms
(ii) Explain importance of mosquito nets
๐ See Answer:
๐ฌ “Mosquitoes spread malaria when they bite. Nets and repellents act like a ๐ก️ shield — they protect us just like armor protects a soldier.”
(iii) What happens if advisories ignored?
๐ See Answer:
⚠️ Risks:
• ๐ค Malaria infection
• ๐ฅ Hospitalization
• ๐ Spread to others
๐ญ 5. Smoking Awareness
(i) What would you say to your uncle?
๐ See Answer:
๐ฌ “Uncle, I care for you ❤️. Smoking may look cool, but it damages lungs ๐ซ, causes cancer and shortens life. Saying NO shows real strength ๐ช.”
(ii) If friend offers cigarette
๐ See Answer:
๐ซ Response:
• “No, thanks”
• “I don’t want to spoil my health”
• ๐ถ Walk away if needed
✔️ Real friends don’t force bad habits
(iii) How can schools help prevent such habits?
๐ See Answer:
๐ซ Schools can:
• ๐ข Awareness campaigns
• ๐จ⚕️ Invite doctors/counsellors
• ๐ฅ Show films & posters
• ๐ Encourage sports, yoga, debates
Class 8 Science Curiosity 3 Question 6 and 7
6. Saniya claims to her friend Vinita that “Antibiotics can cure any infection, so we don’t need to worry about diseases.” What question(s) can Vinita ask her to help Saniya understand that her statement is incorrect?
See Answer• Do antibiotics work against viruses like flu, cold or measles?
• If antibiotics cured every disease, then why do we still need vaccines?
• Why do doctors say not to take antibiotics for coughs and colds?
• Have you heard about antibiotic resistance — when germs stop responding to medicines?
These questions will make Saniya think and understand that antibiotics only work against bacterial infections, not viral or other diseases.
7. The following table contains information about the number of dengue cases reported in a hospital over a period of one year:
Make a bar graph of the number of cases on the Y-axis and the month on the X-axis. Critically analyse your findings and answer the following:
(i) In which three months were the dengue cases highest?
See Answer July, August, September (65 cases each).
(ii) In which month(s) were the cases lowest?
See Answer January (10 cases).
(iii) What natural or environmental factors during the peak months might contribute to the increase in dengue cases?
See Answer Natural/environmental factors during peak months:
• These months fall in the monsoon season.
• Rainwater often collects in puddles, tanks or containers.
• Stagnant water becomes a breeding ground for mosquitoes (Aedes aegypti), which spread dengue.
(iv) Suggest a few preventive steps that the community or government can take before the peak season to reduce the spread of dengue.
See Answer Preventive steps before peak season:
• Clean and cover water tanks; don’t let water stagnate.
• Regular fogging and spraying of insecticides by authorities.
• Encourage people to use mosquito nets and repellents.
• Awareness campaigns in schools, colonies and markets.
• Community cleanliness drives to remove tyres, bottles or open containers where water can collect.
Class 8 Curiosity Chapter 3 Question 8 and 9
❓ 8. Imagine you are in charge of a school health campaign. What key messages would you use to reduce communicable and non-communicable diseases?
๐ See Answer:
๐ฆ For Communicable Diseases:
• ๐งผ Wash hands with soap regularly
• ๐ท Always cover your mouth and nose while coughing or sneezing
• ๐ง Drink only clean and safe water
• ๐งน Keep classrooms and surroundings clean to avoid mosquito breeding
• ๐ Get vaccinated on time
• ๐ Stay home and rest if you are sick to prevent spreading infections
๐ For Non-Communicable Diseases:
• ๐ฅ Eat a balanced diet with fruits, vegetables and less junk food
• ๐ Exercise, play outdoor games or do yoga every day
• ๐ฑ Limit screen time and get enough sleep ๐ด
• ๐ญ Avoid harmful habits like smoking, alcohol or drugs
• ๐ง Manage stress with relaxation, hobbies and talking to family or friends
๐ฏ Slogan idea for the campaign:
๐ “Healthy Habits Today, Strong Future Tomorrow!”
❓ 9. It is recommended that we should not take an antibiotic for a viral infection like a cold, a cough or flu. Can you provide the possible reason for this recommendation?
๐ See Answer:
• ๐ Antibiotics work only against bacteria (kill or stop bacterial growth)
• ๐ฆ Cold, cough and flu are caused by viruses → antibiotics do NOT work
• ⚠️ Wrong use of antibiotics leads to antibiotic resistance
• ❌ Later medicines may not work when actually needed
✔️ Conclusion:
๐ Take antibiotics only when prescribed by a doctor ๐จ⚕️
❓ 10. Which disease(s) among the following may spread if drinking water gets contaminated by the excreta from an infected person?
Hepatitis A, Tuberculosis, Poliomyelitis, Cholera, Chickenpox.
๐ See Answer:
• ๐ Hepatitis A → spreads through contaminated food and water
• ๐ฆ Poliomyelitis (Polio) → spreads through contaminated food/water
• ๐ง Cholera → spreads through contaminated water and food
❓ 11. When our body encounters a pathogen for the first time, the immune response is generally low but on exposure to the same pathogen again, the immune response by the body is much more compared to the first exposure. Why is it so?
๐ See Answer:
๐ฆ First time infection:
• Body is not familiar with pathogen
• ⏳ Takes time to make antibodies
• Response is slow and weak
๐ง Second time infection:
• Body has memory cells
• ⚡ Quickly recognizes pathogen
• ๐ช Produces more antibodies faster
๐ Important:
๐ This is the reason vaccines work — they prepare the body in advance
๐ฏ Final Line
๐ Strong Immunity = Strong Life
๐ Stay healthy, stay safe ๐
