Class 10 Science Chapter 13: Our Environment — practice questions with answers
Free practice for Class 10 Science, Chapter 13: Our Environment. Try the solved questions below, then take a free test with instant marking and explanations.
47 questions24 easy, 16 medium, 7 hardNCERT · CBSE · State boards
Sample questions with solutions
Q1. All the interacting organisms in an area together with the non-living constituents form an ______.
- ecosystem
- food chain
- population
- atmosphere
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Answer: A. ecosystem
Why: It has biotic and abiotic components. [p.208]
Why: It has biotic and abiotic components. [p.208]
Q2. Organisms that make food using sunlight, such as green plants, are called ______.
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Answer: producers
Why: All other organisms depend on them. [p.209]
Why: All other organisms depend on them. [p.209]
Q3. Micro-organisms such as bacteria and fungi that break down dead remains are called ______.
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Answer: decomposers
Why: They return nutrients to the soil. [p.209]
Why: They return nutrients to the soil. [p.209]
Q4. Each step or level of a food chain forms a ______.
- trophic level
- food web
- habitat
- biome
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Answer: A. trophic level
Why: Producers form the first trophic level. [p.210]
Why: Producers form the first trophic level. [p.210]
Q5. Which gas forms a protective layer in the upper atmosphere against UV radiation?
- Ozone (O₃)
- Oxygen (O₂)
- Carbon dioxide
- Nitrogen
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Answer: A. Ozone (O₃)
Why: Ozone shields the Earth from UV rays. [p.212]
Why: Ozone shields the Earth from UV rays. [p.212]
Q6. Which chemicals are mainly responsible for depletion of the ozone layer?
- Chlorofluorocarbons (CFCs)
- Carbon monoxide
- Methane
- Sulphur dioxide
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Answer: A. Chlorofluorocarbons (CFCs)
Why: CFCs were used as refrigerants and in fire extinguishers. [p.213]
Why: CFCs were used as refrigerants and in fire extinguishers. [p.213]
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Frequently asked questions
How many practice questions are there for Class 10 Science Chapter 13: Our Environment?
47 questions (24 easy, 16 medium, 7 hard). A few are solved on this page; the free test shows the answer and explanation for every question after you submit.
Is this chapter from the NCERT book?
Yes — it follows the NCERT Class 10 Science syllabus, used by CBSE and many state boards.