Class 8 Science Chapter 13 Our Home : Earth, a Unique Life Sustaining Planet (New Course)

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I. Chapter Summary

This chapter focuses on Earth’s uniqueness as a life-sustaining planet. It explains the geological features, the essential characteristics that make Earth habitable (such as atmosphere, water, and suitable temperature), and its location in the solar system. The chapter also highlights Earth’s natural resources, biosphere, and the importance of environmental conservation in maintaining the planet’s life-sustaining capabilities.

II. Key Concepts Covered

1. The Solar System

   • Earth’s place in the solar system, its distance from the Sun, and why it supports life.

2. Atmosphere

   • Composition of Earth’s atmosphere: nitrogen, oxygen, carbon dioxide, and other gases.

   • Importance of oxygen and ozone layer for life on Earth.

3. Water

   • Water cycle and availability of water on Earth.

   • Ocean, rivers, lakes, and their role in sustaining life.

4. Temperature and Climate

   • The Earth’s temperature range and how it supports life forms.

   • Factors influencing climate and weather patterns.

5. Earth’s Surface

   • Geological features: mountains, plains, oceans, deserts, etc.

   • Earth’s tectonic plates and their role in shaping the surface.

6. Biosphere

   • The relationship between living organisms and their environment.

   • Ecosystems and food chains.

7. Natural Resources

   • Renewable vs. non-renewable resources.

   • Importance of conservation and sustainable use of resources.

8. Human Impact

   • How human activities (deforestation, pollution, over-exploitation) affect Earth’s life-sustaining features.

   • Environmental conservation efforts like recycling, reducing carbon footprint, and protecting biodiversity.

III. Important Questions

(A) Multiple Choice Questions (1 Mark)

1. Which layer of the Earth’s atmosphere protects us from harmful UV rays?
   (a) Stratosphere
   (b) Troposphere
   (c) Ozone layer ✅
   (d) Mesosphere

2. What percentage of Earth’s surface is covered by water?
   (a) 50%
   (b) 70% ✅
   (c) 80%
   (d) 60%

3. Which planet is known as the “Blue Planet”?
   (a) Venus
   (b) Mars
   (c) Earth ✅
   (d) Jupiter

4. The Earth’s natural resources are:
   (a) Limited ✅
   (b) Unlimited
   (c) Never-ending
   (d) Constant

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

1. Explain why Earth is called the “Goldilocks planet”.

2. How do tectonic plates influence the Earth’s surface?

3. What is the significance of the ozone layer for life on Earth?

4. Define biodiversity and explain its importance.

(C) Long Answer Questions (5 Marks)

1. Describe the water cycle with a diagram.

2. Discuss the importance of Earth’s atmosphere for sustaining life.

3. Explain the impact of human activities on Earth’s environment.

4. What are natural resources? Classify them and explain how they should be conserved.

(D) HOTS (Higher Order Thinking Skills)

1. How would life on Earth change if there were no ozone layer?

2. Imagine you are an environmental scientist. How would you address the issue of global warming on Earth?

IV. Key Formulas/Concepts

• Earth’s position: The third planet from the Sun.

• Solar System Composition: 8 planets, with Earth as the 3rd planet, and Earth’s perfect distance from the Sun (149.6 million km).

• Water cycle: Evaporation → Condensation → Precipitation → Collection.

• Atmosphere: Comprised mainly of 78% nitrogen, 21% oxygen, and traces of other gases.

• Natural Resources:

  • Renewable (solar energy, wind)

  • Non-renewable (coal, oil, natural gas).

V. Deleted Portions (CBSE 2025–2026)

No portions have been deleted from this chapter as per the rationalized NCERT textbooks (ncert.nic.in).

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

VII. Previous Year Questions (PYQs)

1 Mark

• Name the layer of the atmosphere that protects Earth from harmful ultraviolet rays. (2020)

2/3 Marks

• Explain the significance of Earth’s location in the solar system for supporting life. (2021)

• What are natural resources? Classify them. (2022)

5 Marks

• Discuss the geological features of Earth and how they contribute to life on the planet. (2019)

• Draw a labeled diagram to explain the water cycle. (2023)

VIII. Real-World Application Examples

• Space Exploration → The study of Earth’s atmosphere helps in space missions and understanding other planets.

• Agriculture → The availability of water and suitable temperatures for crop growth.

• Climate Change → Understanding the Earth’s temperature and how global warming affects agriculture, wildlife, and human health.

IX. Student Tips & Strategies for Success

Time Management

• Make a study schedule to cover all aspects of this chapter (focus on Earth’s atmosphere, water cycle, and geological features).

• Take time to revise previous year questions for better preparation.

Exam Preparation

• Understand concepts like the water cycle and human impact on Earth in-depth.

• Practice MCQs and diagram-based questions regularly.

Stress Management

• Take frequent breaks while studying to avoid burnout.

• Practice mindfulness and meditation to stay calm before exams.

X. Career Guidance & Exploration

For Classes 9–10

• Explore streams like Science (Biology, Chemistry, Physics), Environmental Science, and Geography.

• Look into Environmental Engineering or Sustainability Careers in both government and private sectors.

For Classes 11–12

• Careers related to climate science, sustainability, conservation biology, and meteorology.

• Prepare for entrance exams like NEET, JEE, and CLAT (for Environmental Law).

• Top institutions: IITs, NITs, and universities offering Environmental Science programs.

XI. Important Notes

• Focus on Earth’s atmosphere, natural resources, and the water cycle for conceptual clarity.

• Always refer to the CBSE website for the latest updates and exam pattern.

• Practice exam-oriented questions with special attention to diagrams (e.g., water cycle and Earth’s layers).