Class 10 Science — Chapter 13: Our Environment
66 practice questions · 22 Easy · 22 Medium · 22 Hard
Practise Class 10 Science Chapter 13, "Our Environment", with 66 NCERT-aligned multiple-choice questions. The set is split into 22 Easy, 22 Medium and 22 Hard questions, so you can warm up on the fundamentals and then push into the exam-level problems that separate top scorers in CBSE Board exams and the JEE & NEET foundation years.
"Our Environment" 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 (+2 correct, −1 wrong, 0 skipped), training the same 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 Environment, 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 10 Science mastery score. A few sample questions are shown below; sign in free to practise all 66.
Key concepts: Our Environment (Class 10 Science)
This chapter looks at how organisms interact with their surroundings through ecosystems and food chains, and at the impact of human activity on the environment.
- Ecosystem
- A community of organisms (biotic) and their physical surroundings (abiotic), interacting as producers, consumers and decomposers.
- Food chain and food web
- Energy flows from producers to consumers across trophic levels; interconnected food chains form a food web.
- Ten per cent law
- Only about 10% of the energy at one trophic level is passed on to the next, so chains are usually short (4–5 levels).
- Biological magnification
- Harmful, non-biodegradable chemicals become more concentrated at each higher trophic level.
- Ozone layer & waste
- Ozone shields us from UV rays; CFCs deplete it. Wastes are biodegradable or non-biodegradable, needing proper management.
Key formulas — Our Environment
💡 Exam tips for Our Environment
- Energy flow in an ecosystem is unidirectional — it does not cycle back.
- Top-level consumers accumulate the most toxins because of biomagnification.
Sample questions
In a food chain, plants are:
Plants make food via photosynthesis.
According to the 10% law, energy passed to next trophic level is:
Only ~10% energy transfers up; rest is lost as heat.
Ozone layer depletion is caused by:
CFCs release Cl atoms that destroy ozone.
Our Environment — FAQs
What are the key concepts in Class 10 Science Our Environment?+
This chapter looks at how organisms interact with their surroundings through ecosystems and food chains, and at the impact of human activity on the environment. Key ideas include Ecosystem, Food chain and food web, Ten per cent law, Biological magnification, Ozone layer & waste.
What does Class 10 Science Chapter 13 (Our Environment) cover on XamBaaz?+
It covers 66 NCERT-aligned MCQs on "Our Environment" — 22 Easy, 22 Medium and 22 Hard — each with a timed quiz and an instant explanation, suitable for CBSE Board exams and the JEE & NEET foundation years.
Are these "Our Environment" questions free to practise?+
Yes — sign in with Google to practise "Our Environment" free. Full unlimited access is ₹999/year (limited-time launch price), with no per-chapter charges.
How should I revise "Our Environment" 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.
Practise all 66 questions free
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