Class 10 Science Chapter 13: Our Environment — 2 Marker Important Questions
Practice Our Environment 2 Marker important questions and mock-test sets for CBSE revision.
Topic-wise important and practice questions
Review question distribution across chapter topics for 2 Mark questions.
| Topic | 2 Mark |
|---|---|
| Biodegradable Substances | 2 |
| Food Chains and Trophic Levels | 2 |
| Non-Biodegradable Substances | 4 |
| Environmental Effects of Biodegradable Waste | 3 |
| Natural and Human-Made Ecosystems | 2 |
| CFCs and Ozone Depletion | 2 |
| Ecosystem: Biotic and Abiotic Components | 2 |
| Limits on Food-Chain Length | 2 |
| Ozone Layer and UV Protection | 2 |
| Waste Segregation and Local Waste Management | 2 |
| Biological Magnification | 3 |
| Environment-Friendly Practices | 2 |
| Food Webs and Interdependence | 1 |
| International Action on Ozone-Depleting Substances | 2 |
| Removing a Trophic Level and Ecosystem Balance | 1 |
| Producers and Photosynthetic Autotrophs | 2 |
| Trophic Position and Pollutant Concentration | 2 |
| Environmental Effects of Non-Biodegradable Waste | 2 |
| Enzyme Specificity and Biodegradability | 1 |
| Formation of Ozone in the Upper Atmosphere | 1 |
| Lifestyle, Disposable Materials and Waste Generation | 1 |
| Unidirectional Flow of Energy | 1 |
| Decomposers and Nutrient Recycling | 1 |
| Energy Capture by Producers | 2 |
| Entry of Pesticides into Food Chains | 2 |
| Consumers: Herbivores, Carnivores, Omnivores and Parasites | 2 |
| Ten Percent Law of Energy Transfer | 1 |
2 Marker Preparation & Exam Strategy
2 Mark short answer questions require structured two-point answers, brief reasoning, simple differences, or short two-step calculations.
- Structure answers into two distinct, numbered points for clear evaluation.
- For distinction or comparison questions, provide at least two clear parameters of difference.
- Always show the primary formula and step-by-step substitution for calculations.
Sample Questions
Q1. Differentiate between two fundamental processes or classifications discussed in Our Environment.
Model Answer: State at least two clear points of contrast addressing definition, mechanism, or relevant conditions.
Q2. Explain why a specific condition is necessary for the mechanism in Our Environment to take place.
Model Answer: Provide scientific or mathematical reasoning showing the cause-and-effect relationship behind the required condition.
Q3. A student makes an observation related to Our Environment. State two factors that could influence this result.
Model Answer: Identify the two primary environmental, physical, or experimental factors that directly alter the outcome.