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💚 Health: The Ultimate Treasure Class 8 Science Chapter 3 Solutions | Curiosity Book

 

 


💚 Health: The Ultimate Treasure


🌟 1. What is Health?

📌 Definition

Health is not just absence of disease.

WHO Definition:

Health = Complete physical, mental and social well-being


A Healthy Person

A healthy person:

  • Works efficiently
  • Adjusts well with family, friends, society
  • Can handle difficult situations (cope with stress)

🧠 Real-Life Example

  • A boy felt lonely
  • Used too much phone & social media
  • Developed:
    • headaches
    • sleep problems

👉 Shows mental health affects physical health


🌿 Ayurveda Concept of Health

Health = Balance of body, mind and surroundings

Key Practices:

  • Dinacharya (daily routine)
  • Ritucharya (seasonal routine)
  • Fresh food 🍎
  • Yoga 🧘‍♂️
  • Meditation & mindfulness

🏃 2. How Can We Stay Healthy?


🥗 2.1 Healthy Lifestyle

✔️ Do’s:

  • Eat balanced diet
    (fruits, vegetables, whole grains)
  • Stay physically active
    (sports, walking, cycling)
  • Sleep properly
  • Practice:
    • Yoga
    • Pranayama
    • Meditation

Avoid:

  • Junk food 🍔
  • Oily & sugary food
  • Excess screen time
  • Tobacco, alcohol, drugs

🌳 Extra Tip:

  • Spend time in nature & outdoors

🌍 2.2 Clean Environment

📌 Importance:

  • Clean surroundings prevent diseases
  • Dirty places mosquitoes, flies infections

🌫️ Air Pollution

  • Causes:
    • cough
    • asthma

👉 Measured by:

AQI (Air Quality Index)


💧 Safe Water

  • Prevents water-borne diseases

🧠 Mental Health Matters

Negative:

  • Loneliness
  • Stress

Positive:

  • Family time ❤️
  • Friendship 🤝
  • Laughter 😄

🤒 3. How Do We Know We Are Unwell?

When body does not function normally, we feel unwell.


🔍 Symptoms vs Signs

🧠 Symptoms (felt)

  • Pain
  • Tiredness
  • Dizziness

👀 Signs (observed/measured)

  • Fever
  • Rash
  • Swelling
  • High blood pressure

👉 Doctors use both to diagnose disease


🦠 4. Diseases: Causes and Types


📌 4.1 What is Disease?

Disease = Condition that disturbs normal functioning of body or mind


🔄 4.2 Types of Diseases


🦠 1. Communicable Diseases

📌 Meaning:

  • Spread from person to person

Cause:

  • Pathogens:
    • Bacteria
    • Viruses
    • Protozoa
    • Fungi
    • Worms

📍 Examples:

  • Cold, Flu
  • Chickenpox
  • Measles
  • TB
  • Cholera
  • Typhoid
  • Malaria
  • Dengue
  • COVID-19

🔁 Modes of Spread:

  • Air (cough/sneeze)
  • Direct contact
  • Indirect contact (sharing items)
  • Contaminated food/water
  • Vectors (mosquitoes, flies)

🚫 2. Non-Communicable Diseases (NCDs)

📌 Meaning:

  • Do not spread person to person

Causes:

  • Lifestyle
  • Poor diet
  • Environment

📍 Examples:

  • Diabetes
  • Cancer
  • Asthma
  • Obesity
  • High BP

🧪 Deficiency Diseases:

  • Anaemia Iron deficiency
  • Goitre Iodine deficiency
  • Scurvy Vitamin C deficiency

👉 Many are chronic (long-lasting)


🌬️ 5. Communicable Diseases – Examples


🌫️ 5.1 Airborne Diseases

Disease

Cause

Symptoms

Prevention

Cold/Flu

Virus

Runny nose, fever

Handwash, cover mouth

Chickenpox

Virus

Rash, fever

Isolation, vaccine

Measles

Virus

Red rash

Hygiene, vaccine

TB

Bacteria

Cough, weight loss

Hygiene, vaccine


💧 5.2 Food & Waterborne Diseases

Disease

Cause

Prevention

Hepatitis A

Virus

Boiled water, vaccine

Cholera

Bacteria

Clean food/water

Typhoid

Bacteria

Hygiene, vaccine

Ascariasis

Worms

Cooked food, hygiene


🦟 5.3 Vector-Borne Diseases

Disease

Spread by

Prevention

Malaria

Mosquito

Nets, repellents

Dengue

Mosquito

Avoid stagnant water


⚠️ 6. Non-Communicable Diseases – Examples


🍔 Obesity

  • Cause: overeating + no exercise
  • Prevention: diet + activity

🍬 Diabetes

  • Symptoms:
    • Frequent urination
    • Tiredness
  • Prevention:
    • Controlled diet
    • Exercise

❤️ High Blood Pressure

  • Called silent disease
  • Controlled by lifestyle

🫁 Others:

  • Cancer
  • Asthma
    👉 Caused by pollution, smoking, environment

🛡️ 7. Prevention and Control of Diseases


💪 7.1 Immunity

📌 Meaning:

Body’s natural defense system

👉 Strong immunity = less disease


💉 7.2 Vaccination

📌 Definition:

Provides acquired immunity

Made from:

  • Weak/dead germs
  • Harmless parts of germs

📍 Examples:

  • Polio
  • Measles
  • Tetanus
  • Hepatitis

👨‍🔬 Scientist:

  • Edward Jenner First vaccine (smallpox)

🇮🇳 India’s Role:

  • Earlier method: Variolation
  • Today: Major vaccine producer
  • Important role in COVID-19 vaccines

💊 7.3 Treatment

Antibiotics:

  • Kill bacteria
  • Do NOT work on viruses

👨‍🔬 Discovery:

  • Alexander Fleming (1928) Penicillin

⚠️ Warning:

Misuse Antibiotic Resistance

👉 Bacteria survive even after treatment


🌿 7.4 Traditional Medicine

Systems:

  • Ayurveda
  • Siddha
  • Unani

Focus:

  • Natural herbs
  • Diet & lifestyle
  • Prevention

👨‍🔬 8. Important Scientists

  • Edward Jenner First vaccine
  • Alexander Fleming First antibiotic
  • Dr. Kamal Ranadive Cancer research
  • Dr. Maharaj Kishan Bhan Rotavirus vaccine

📌 9. Snapshots (Quick Revision)


One-Line Points

  • Health = physical + mental + social well-being
  • Lifestyle + environment affect health
  • Diseases:
    • Communicable
    • Non-communicable

  • Symptoms = what we feel
  • Signs = what we see/measure

  • Immunity protects us
  • Vaccines make immunity stronger

  • Antibiotics:
    • Work on bacteria
    • Not on viruses

  • Misuse resistance

🎯 Golden Line:

Prevention is better than cure


🏁 Final Conclusion

Health is our greatest wealth (सबसे बड़ा धन) 💰

To stay healthy:

  • Eat well
  • Stay active
  • Keep surroundings clean
  • Maintain mental peace
  • Take vaccines
  • Follow hygiene

🌟 Final Formula:

Healthy Lifestyle + Clean Environment + Strong Immunity = Good Health


 

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