Class 10 Science Chapter 13: Our Environment — Important Questions & Mock Tests
Practice Our Environment topic-wise important questions, MCQs and 1, 2, 3 and 5 mark questions for CBSE revision.
300 Questions 27 Topics MCQs: 100 1 Mark: 50 2 Mark: 50 3 Mark: 50 5 Mark: 50
Topic-wise important and practice questions
Review question distribution across chapter topics for MCQs, 1 Mark questions, 2 Mark questions, 3 Mark questions, 5 Mark questions.
| Topic | MCQ | 1 Mark | 2 Mark | 3 Mark | 5 Mark | Total |
|---|---|---|---|---|---|---|
| Biodegradable Substances | 6 | 2 | 2 | 5 | 1 | 16 |
| Food Chains and Trophic Levels | 5 | 3 | 2 | 3 | 3 | 16 |
| Non-Biodegradable Substances | 4 | 2 | 4 | 2 | 3 | 15 |
| Environmental Effects of Biodegradable Waste | 4 | 1 | 3 | 2 | 4 | 14 |
| Natural and Human-Made Ecosystems | 5 | 3 | 2 | 2 | 2 | 14 |
| CFCs and Ozone Depletion | 4 | 3 | 2 | 2 | 2 | 13 |
| Ecosystem: Biotic and Abiotic Components | 5 | 3 | 2 | 0 | 3 | 13 |
| Limits on Food-Chain Length | 4 | 3 | 2 | 2 | 2 | 13 |
| Ozone Layer and UV Protection | 4 | 2 | 2 | 3 | 2 | 13 |
| Waste Segregation and Local Waste Management | 5 | 1 | 2 | 3 | 2 | 13 |
| Biological Magnification | 3 | 3 | 3 | 1 | 2 | 12 |
| Environment-Friendly Practices | 3 | 2 | 2 | 2 | 3 | 12 |
| Food Webs and Interdependence | 5 | 1 | 1 | 2 | 3 | 12 |
| International Action on Ozone-Depleting Substances | 4 | 1 | 2 | 2 | 2 | 11 |
| Removing a Trophic Level and Ecosystem Balance | 3 | 3 | 1 | 2 | 2 | 11 |
| Producers and Photosynthetic Autotrophs | 3 | 2 | 2 | 1 | 2 | 10 |
| Trophic Position and Pollutant Concentration | 3 | 2 | 2 | 2 | 1 | 10 |
| Environmental Effects of Non-Biodegradable Waste | 3 | 2 | 2 | 1 | 1 | 9 |
| Enzyme Specificity and Biodegradability | 3 | 3 | 1 | 2 | 0 | 9 |
| Formation of Ozone in the Upper Atmosphere | 4 | 2 | 1 | 0 | 2 | 9 |
| Lifestyle, Disposable Materials and Waste Generation | 4 | 0 | 1 | 3 | 1 | 9 |
| Unidirectional Flow of Energy | 3 | 3 | 1 | 1 | 1 | 9 |
| Decomposers and Nutrient Recycling | 3 | 1 | 1 | 1 | 2 | 8 |
| Energy Capture by Producers | 2 | 2 | 2 | 2 | 0 | 8 |
| Entry of Pesticides into Food Chains | 3 | 0 | 2 | 1 | 2 | 8 |
| Consumers: Herbivores, Carnivores, Omnivores and Parasites | 3 | 0 | 2 | 1 | 1 | 7 |
| Ten Percent Law of Energy Transfer | 2 | 0 | 1 | 2 | 1 | 6 |