Class 8 Science Chapter 3 Health: The Ultimate Treasure (New Course)

Class 8 -> Science -> Chapter 3: Health – The Ultimate Treasure (New Course)

I. Chapter Summary:

This chapter explains the importance of health as a valuable asset for a happy and productive life. It highlights the meaning of good health, which includes physical, mental, and social well-being. The chapter discusses nutrients, balanced diet, diseases, and ways to maintain good health through proper habits like exercise, hygiene, and rest. It also explains the role of healthcare services, immunization, and awareness in preventing diseases.

II. Key Concepts Covered:

What is Health?

• Health is a state of complete physical, mental, and social well-being, not just the absence of disease.
• Good health helps in:
  • Proper growth
  • Efficient work
  • Better quality of life

Types of Health:

1. Physical Health:
   • Healthy body and proper functioning of organs.
   • Maintained through proper nutrition and exercise.
2. Mental Health:
   • Ability to think clearly and handle stress.
   • Includes emotional stability.
3. Social Health:
   • Ability to interact and maintain relationships.

Balanced Diet:

• A balanced diet contains all essential nutrients:
  • Carbohydrates: Provide energy
  • Proteins: Help in growth and repair
  • Fats: Provide energy and insulation
  • Vitamins: Protect against diseases
  • Minerals: Help in body functions
  • Water: Essential for all processes
• Importance:
  • Maintains energy
  • Prevents diseases
  • Supports growth

Diseases:

1. Communicable Diseases:
   • Spread from one person to another.
   • Examples: cold, flu, tuberculosis
2. Non-Communicable Diseases:
   • Do not spread.
   • Examples: diabetes, heart disease

Causes of Diseases:

• Poor hygiene
• Unhealthy food
• Lack of exercise
• Infection by microorganisms

Prevention of Diseases:

• Maintain personal hygiene:
  • Regular bathing
  • Washing hands
• Clean environment:
  • Proper waste disposal
  • Clean water
• Vaccination:
  • Protects against diseases
• Healthy lifestyle:
  • Balanced diet
  • Regular exercise
  • Adequate rest

Role of Exercise and Rest:

• Exercise:
  • Keeps body fit
  • Improves blood circulation
• Rest and Sleep:
  • Helps body recover
  • Keeps mind fresh

Healthcare Services:

• Hospitals, clinics, and health centers provide treatment.
• Government programs help improve public health.

III. Important Questions:

(A) Multiple Choice Questions (MCQs) (1 Mark):

1. Health includes:
   • a) Only physical well-being
   • b) Only mental well-being
   • c) Physical, mental, and social well-being
   • d) Only absence of disease
   • Answer: c) Physical, mental, and social well-being
2. Which nutrient helps in body growth?
   • a) Carbohydrates
   • b) Proteins
   • c) Fats
   • d) Vitamins
   • Answer: b) Proteins
3. Which is a communicable disease?
   • a) Diabetes
   • b) Cancer
   • c) Tuberculosis
   • d) Heart disease
   • Answer: c) Tuberculosis
4. Vaccination helps to:
   • a) Cure diseases
   • b) Prevent diseases
   • c) Increase weight
   • d) Improve taste
   • Answer: b) Prevent diseases

(B) Short Answer Questions (2/3 Marks):

1. What is meant by balanced diet?
2. Define health.
3. What are communicable diseases?
4. Why is exercise important?

(C) Long Answer Questions (5 Marks):

1. Explain the components of a balanced diet.
2. Describe different types of health.
3. Explain the causes and prevention of diseases.
4. Discuss the importance of hygiene in maintaining health.

(D) HOTS (Higher Order Thinking Skills) Questions:

1. Why is health called the ultimate treasure?
2. How can lifestyle changes improve health?

IV. Key Formulas/Concepts:

• Health: Physical + Mental + Social well-being
• Balanced Diet: Proper mix of nutrients
• Communicable Diseases: Spread from person to person
• Non-Communicable Diseases: Do not spread

V. Deleted Portions (CBSE 2025-2026 as per rationalization of NCERT books):

No portions have been deleted from this chapter as per the rationalized NCERT textbooks.

VI. Chapter-Wise Marks Bifurcation (Estimated – CBSE 2025-2026):

VII. Previous Year Questions (PYQs):

• 2019 (1 Mark): What is a balanced diet?
• 2020 (3 Marks): Explain types of health.
• 2021 (5 Marks): Discuss disease prevention methods.

VIII. Real-World Application Examples to Connect with Topics:

• Daily Exercise Routine: Keeps body healthy.
• Vaccination Programs: Prevent diseases like polio.
• Healthy Eating Habits: Improve immunity.

IX. Student Tips & Strategies for Success (Class-Specific):

• Time Management: Focus on diet, diseases, and prevention.
• Exam Preparation: Learn definitions and examples.
• Tip: Use charts for nutrients.

X. Career Guidance & Exploration (Class-Specific):

For Class 8, awareness level:

• Related fields:
  • Medicine
  • Nutrition
  • Health Sciences
• Future careers:
  • Doctor
  • Nutritionist
  • Health Worker

XI. Important Notes:

• Health is the greatest wealth.
• Follow healthy habits daily.
• Maintain cleanliness and hygiene.
• Refer to NCERT/CBSE for updates.