Class 8 Science Chapter 13 Our Home: Earth, a Unique Life Sustaining Planet is a high-frequency chapter in the CBSE Class 8 Science exam. These class 8 science handwritten notes chapter 13 Our Home: Earth, a Unique Life Sustaining Planet follow the 2026-27 NCERT and cover why earth is a unique planet, planets of the solar system, greenhouse.
- CBSE Class 8 Weightage: a scoring chapter in the Science paper, asked in short and long answers.
- What the notes cover: why earth is a unique planet, planets of the solar system, greenhouse effect, position and habitable zone.
- Best for: quick revision before Class 8 exams and a strong base for Class 9.
You can read the complete class 8 science handwritten notes for Our Home: Earth, a Unique Life Sustaining Planet, with key terms, boxed definitions, and quick revision points, in the PDF below.
These handwritten notes are written by subject teachers, mapped to the 2026-27 NCERT, and checked against the last five years of CBSE Class 8 Science papers.
What the Our Home: Earth, a Unique Life Sustaining Planet Handwritten Notes Cover
This chapter puts together the whole book to explain why Earth is a special planet that supports life. It looks at the conditions that make Earth habitable, how life is sustained and continued, and the threats it faces today.
- Why Earth is a unique planet
- Planets of the solar system
- Greenhouse effect
- Position and habitable zone
- Size, atmosphere and ozone layer
- Magnetic field of the Earth
- Air, water, soil and the Earth systems
- Reproduction and continuity of life
- Asexual and sexual reproduction
- Threats to life and the triple planetary crisis
Our Home: Earth, a Unique Life Sustaining Planet Self-Assessment Quiz
Try these quick questions after you read the notes. Tap each question to check your answer. They cover the points CBSE asks most often.
The range of distances where water can stay liquid is called the?
(a) ozone layer (b) habitable zone (c) magnetic field (d) biosphere
Answer: (b) habitable zone - also called the Goldilocks zone
The gas layer that blocks harmful ultraviolet rays is the?
(a) hydrosphere (b) geosphere (c) ozone layer (d) greenhouse
Answer: (c) ozone layer - it acts like a shield against UV rays
In asexual reproduction, the offspring are?
(a) different from the parent (b) exact copies of the parent (c) from two parents (d) always male
Answer: (b) exact copies of the parent - a single parent is involved
Why is Venus hotter than Mercury even though it is farther from the Sun?
(a) it is bigger (b) its thick atmosphere traps heat (c) it has water (d) it has a magnetic field
Answer: (b) its thick atmosphere traps heat - this is the greenhouse effect
Climate change, biodiversity loss and pollution together are called the?
(a) habitable zone (b) greenhouse effect (c) triple planetary crisis (d) Goldilocks zone
Answer: (c) triple planetary crisis - the biggest challenges facing life today
Our Home: Earth, a Unique Life Sustaining Planet Topic-wise Weightage for CBSE Class 8 Science
Some parts of this chapter are asked more often than others. The table below shows which sub-topics to revise first, based on recent CBSE Class 8 question trends.
| Sub-topic | Weightage | CBSE Frequency |
|---|---|---|
| Conditions that make Earth habitable | High | asked often |
| Habitable zone and position of the Earth | High | asked often |
| Asexual and sexual reproduction | High | asked often |
| Earth systems: atmosphere, hydrosphere, geosphere, biosphere | Medium | asked sometimes |
| Greenhouse effect and magnetic field | Medium | asked sometimes |
| Threats to life and the triple planetary crisis | Low | asked rarely |
Key Terms and Ideas in Our Home: Earth, a Unique Life Sustaining Planet
These are the terms and ideas the exam asks about most. Learn each one so you can define it and use it in your answers.
| Term / Idea | What it means |
|---|---|
| Habitable zone | the range of distances from a star where water can stay liquid, also called the Goldilocks zone |
| Greenhouse effect | the trapping of heat by gases like carbon dioxide that keeps a planet warm |
| Ozone layer | a layer of ozone in the atmosphere that blocks harmful ultraviolet rays |
| Magnetic field | the shield around Earth that pushes away harmful particles from space |
| Atmosphere | the layer of gases surrounding the Earth that supports life |
| Hydrosphere | all the water on Earth in ponds, rivers, seas and groundwater |
| Geosphere | the solid parts of Earth, such as rocks, soil and minerals |
| Biosphere | all living beings and the places where they live |
| Asexual reproduction | a single parent produces offspring that are exact copies of itself |
| Sexual reproduction | two parents produce offspring that share traits of both but are not identical |
How Collegedunia's Handwritten Notes Help You Revise Our Home: Earth, a Unique Life Sustaining Planet
These notes are made for the night before the exam. They keep the facts short and easy to scan. Collegedunia maps every point to the 2026-27 NCERT.
- Clear handwriting: each topic is written in neat, easy-to-read handwriting.
- Boxed key terms: the main terms and definitions are boxed by hand for fast recall.
- Diagrams and tables: simple hand-drawn tables and charts make ideas clear.
- Colour-coded headings: new sub-topics stand out, so you find any section in seconds.
How to Use These Handwritten Notes for Class 8 Science Revision
Use these class 8 science handwritten notes in two passes. Read them slowly once for the full chapter. Then, near the exam, read only the boxes and key terms for a fast recall.
- Read the notes once with the NCERT chapter open beside you.
- Say each key term and idea in your own words.
- Practise one long-answer question from a past paper.
- On the last day, revise only the key terms and the boxes.
Class 8 Science Handwritten Notes for All Chapters
The table below links the class 8 science handwritten notes for every chapter. Use it to jump to any other chapter's notes.
Our Home: Earth, a Unique Life Sustaining Planet Class 8 Science Handwritten Notes FAQs
Ques. Where can I download Our Home: Earth, a Unique Life Sustaining Planet Class 8 Science Handwritten Notes PDF?
Ans. You can download the Our Home: Earth, a Unique Life Sustaining Planet Class 8 Science Handwritten Notes PDF directly from this page. Both the Normal and HD versions are free.
Ques. Are these handwritten notes aligned with the 2026-27 NCERT?
Ans. Yes. These notes follow the current 2026-27 syllabus for Class 8 Science. what makes Earth suitable for life
Ques. How many pages is the Class 8 Science Our Home: Earth, a Unique Life Sustaining Planet Handwritten Notes PDF?
Ans. The notes run about 20 pages. They cover the full chapter with key terms, hand-drawn boxes, and a short self-assessment quiz.
Ques. What is the main idea of the 8th standard Science chapter Our Home: Earth, a Unique Life Sustaining Planet?
Ans. The chapter explains that Earth is unique because a rare mix of conditions supports life, including its distance from the Sun, its size, its atmosphere, the ozone layer and its magnetic field. It also shows how reproduction keeps life going and how human actions now threaten this delicate balance.
Ques. Are these Our Home: Earth, a Unique Life Sustaining Planet notes enough for the CBSE Class 8 exam?
Ans. Yes, for revision. The Collegedunia handwritten notes cover every key point and exam term. Read them with the NCERT chapter and practise past questions.
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