Class 9 Social Science — Chapter 11: Life on Earth
72 practice questions · 24 Easy · 24 Medium · 24 Hard
Practise the most important Class 9 Social Science questions from Chapter 11, "Life on Earth" — 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.
"Life on Earth" is one of the chapters where dates, cause-and-effect reasoning and map/source interpretation 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 Life on Earth, 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 9 Social Science mastery score. A sample question is shown below; sign in free to see its answer and practise all 72.
Key concepts: Life on Earth (Class 9 Social Science)
Life on earth is remarkably varied, and that variety is itself a resource. This chapter covers biodiversity and the ecosystems that sustain it, the forests that shelter much of it, the livelihoods that depend on them, and the case for conservation.
- Biodiversity
- The variety of living organisms in an area — the range of species, the genetic variation within them, and the ecosystems they form.
- Ecosystem
- A community of living organisms interacting with each other and with the non-living environment as a functioning unit.
- Flora and fauna
- The plant life and animal life of a region, shaped by its climate, relief and soil.
- Why biodiversity matters
- It supplies food, medicine, timber and fuel, keeps soil fertile, pollinates crops and regulates climate and water.
Try a sample question
One free sample from this chapter — sign in to check your answer and practise the rest.
Two tigers in the same forest look slightly different in size, colour and stripe pattern. This kind of variety is an example of:
Unlock the full chapter — free
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 →Life on Earth — FAQs
What are the key concepts in Class 9 Social Science Life on Earth?+
Life on earth is remarkably varied, and that variety is itself a resource. This chapter covers biodiversity and the ecosystems that sustain it, the forests that shelter much of it, the livelihoods that depend on them, and the case for conservation. Key ideas include Biodiversity, Ecosystem, Flora and fauna, Why biodiversity matters.
What does Class 9 Social Science Chapter 11 (Life on Earth) cover on XamBaaz?+
It covers 72 NCERT-aligned MCQs on "Life on Earth" — 24 Easy, 24 Medium and 24 Hard — each with a timed quiz and an instant explanation, suitable for CBSE Board exams.
Are these "Life on Earth" questions free to practise?+
Yes — sign in with Google to practise "Life on Earth" free. Full unlimited access is ₹999/year (limited-time launch price), with no per-chapter charges.
How should I revise "Life on Earth" 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 "Life on Earth" 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 "Life on Earth" 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 Life on Earth?+
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 "Life on Earth".