Class 8 Science — Chapter 13: Our Home: Earth, a Unique Life-Sustaining Planet
72 practice questions · 24 Easy · 24 Medium · 24 Hard
Practise the most important Class 8 Science questions from Chapter 13, "Our Home: Earth, a Unique Life-Sustaining Planet" — 72 NCERT-aligned multiple-choice questions with answers and explanations. The set is split into 24 Easy, 24 Medium and 24 Hard, so you can warm up on the fundamentals and then push into the exam-level problems that separate top scorers in CBSE Board exams.
"Our Home: Earth, a Unique Life-Sustaining Planet" is one of the chapters where concept clarity across physics, chemistry and biology basics really pays off. Each MCQ on this chapter is timed and uses exam-grade marking (+4 correct, −1 wrong, 0 skipped), training the same negative-marking accuracy-under-pressure that real papers demand. Every question carries a short explanation, so a wrong answer becomes a quick lesson rather than a dead end — the fastest way to close gaps before a test.
Use this chapter as targeted revision: attempt the Easy set first to confirm your basics on Our Home: Earth, a Unique Life-Sustaining Planet, then move to Medium and Hard to test application and problem-solving. Your accuracy, streaks and XP save automatically, and the chapter feeds into your overall Class 8 Science mastery score. A sample question is shown below; sign in free to see its answer and practise all 72.
Key concepts: Our Home: Earth, a Unique Life-Sustaining Planet (Class 8 Science)
This closing chapter asks what makes the Earth 'just right' for life. Its distance from the Sun places it in the habitable, or Goldilocks, zone where liquid water — essential for life — can exist. Its size gives it enough gravity to hold an atmosphere of mostly nitrogen and oxygen, whose natural greenhouse effect keeps the planet warm. The ozone layer blocks harmful ultraviolet rays and the magnetic field shields us from harmful particles from the Sun. But human activities — burning fossil fuels, releasing greenhouse gases, polluting and destroying habitats — are causing global warming, climate change and biodiversity loss, so protecting our unique home is urgent.
- Earth is unique for life
- As far as we know, Earth is the only planet that supports life, thanks to a rare combination of conditions working together.
- Right distance and liquid water
- Earth lies at the right distance from the Sun for moderate temperatures at which water stays liquid — and liquid water is essential for life.
- Habitable (Goldilocks) zone
- The region around a star where a planet is 'not too hot and not too cold' for liquid water; Mars lies at the edge of the Sun's habitable zone.
- Right size and the atmosphere
- Earth is large enough for its gravity to hold on to an atmosphere — the layer of gases around it; a small planet with weak gravity would lose its gases to space.
Try a sample question
One free sample from this chapter — sign in to check your answer and practise the rest.
If Earth were much closer to the Sun, its water would likely:
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See the answer and solution to this question, then practise all 72 questions (24 Easy · 24 Medium · 24 Hard) with timed scoring and instant feedback, plus the complete key-concept notes, formulas & exam tips. Sign in with Google — no card needed.
Start this chapter free →Our Home: Earth, a Unique Life-Sustaining Planet — FAQs
What are the key concepts in Class 8 Science Our Home: Earth, a Unique Life-Sustaining Planet?+
This closing chapter asks what makes the Earth 'just right' for life. Its distance from the Sun places it in the habitable, or Goldilocks, zone where liquid water — essential for life — can exist. Its size gives it enough gravity to hold an atmosphere of mostly nitrogen and oxygen, whose natural greenhouse effect keeps the planet warm. The ozone layer blocks harmful ultraviolet rays and the magnetic field shields us from harmful particles from the Sun. But human activities — burning fossil fuels, releasing greenhouse gases, polluting and destroying habitats — are causing global warming, climate change and biodiversity loss, so protecting our unique home is urgent. Key ideas include Earth is unique for life, Right distance and liquid water, Habitable (Goldilocks) zone, Right size and the atmosphere.
What does Class 8 Science Chapter 13 (Our Home: Earth, a Unique Life-Sustaining Planet) cover on XamBaaz?+
It covers 72 NCERT-aligned MCQs on "Our Home: Earth, a Unique Life-Sustaining Planet" — 24 Easy, 24 Medium and 24 Hard — each with a timed quiz and an instant explanation, suitable for CBSE Board exams.
Are these "Our Home: Earth, a Unique Life-Sustaining Planet" questions free to practise?+
Yes — sign in with Google to practise "Our Home: Earth, a Unique Life-Sustaining Planet" free. Full unlimited access is ₹999/year (limited-time launch price), with no per-chapter charges.
How should I revise "Our Home: Earth, a Unique Life-Sustaining Planet" for the exam?+
Start with the Easy quiz to confirm your fundamentals, then attempt Medium and Hard for application-level practice. Review each explanation, retry the questions you miss, and track your accuracy on this chapter until it is consistently high.
Are these "Our Home: Earth, a Unique Life-Sustaining Planet" MCQs available with answers?+
Yes. This page shows one sample question so you can see the format; sign in free with Google to reveal the correct option and a step-by-step "Why" explanation for it, then practise all 72 questions with instant scoring.
Is there negative marking in the "Our Home: Earth, a Unique Life-Sustaining Planet" quizzes?+
Yes — the timed quizzes use exam-grade marking: +4 for a correct answer, −1 for a wrong one and 0 for a skipped question, so you practise the same negative-marking discipline as CBSE Board exams.
Are these important questions for Our Home: Earth, a Unique Life-Sustaining Planet?+
The set is curated to the NCERT syllabus and weighted toward the question patterns that actually appear in CBSE Board exams, across Easy, Medium and Hard — so it doubles as an "important questions" revision list for "Our Home: Earth, a Unique Life-Sustaining Planet".