Class 10 Science Chapter 13: Our Environment — 1 Marker Important Questions
Practice Our Environment 1 Marker important questions and mock-test sets for CBSE revision.
Topic-wise important and practice questions
Review question distribution across chapter topics for 1 Mark questions.
| Topic | 1 Mark |
|---|---|
| Biodegradable Substances | 2 |
| Food Chains and Trophic Levels | 3 |
| Non-Biodegradable Substances | 2 |
| Environmental Effects of Biodegradable Waste | 1 |
| Natural and Human-Made Ecosystems | 3 |
| CFCs and Ozone Depletion | 3 |
| Ecosystem: Biotic and Abiotic Components | 3 |
| Limits on Food-Chain Length | 3 |
| Ozone Layer and UV Protection | 2 |
| Waste Segregation and Local Waste Management | 1 |
| Biological Magnification | 3 |
| Environment-Friendly Practices | 2 |
| Food Webs and Interdependence | 1 |
| International Action on Ozone-Depleting Substances | 1 |
| Removing a Trophic Level and Ecosystem Balance | 3 |
| Producers and Photosynthetic Autotrophs | 2 |
| Trophic Position and Pollutant Concentration | 2 |
| Environmental Effects of Non-Biodegradable Waste | 2 |
| Enzyme Specificity and Biodegradability | 3 |
| Formation of Ozone in the Upper Atmosphere | 2 |
| Lifestyle, Disposable Materials and Waste Generation | 0 |
| Unidirectional Flow of Energy | 3 |
| Decomposers and Nutrient Recycling | 1 |
| Energy Capture by Producers | 2 |
| Entry of Pesticides into Food Chains | 0 |
| Consumers: Herbivores, Carnivores, Omnivores and Parasites | 0 |
| Ten Percent Law of Energy Transfer | 0 |
1 Marker Preparation & Exam Strategy
1 Mark very short answer questions for Class 10 Science Our Environment focus on direct definitions, standard units, core formulas, and precise single-line explanations.
- Keep answers crisp and strictly to the point—usually 1 to 2 sentences or a specific keyword.
- Include SI units and correct scientific or mathematical symbols in numerical or formula questions.
- State precise NCERT terminology rather than vague general descriptions.
Sample Questions
Q1. Define the primary term introduced in Our Environment.
Model Answer: The primary concept in Our Environment represents the foundational relationship or definition established in the NCERT textbook.
Q2. State the SI unit or standard measure associated with key quantities in Our Environment.
Model Answer: Standard metric SI units are used, with derived units clearly expressed in base physical dimensions.
Q3. Give one everyday application or natural occurrence of the phenomena in Our Environment.
Model Answer: Phenomena in Our Environment are commonly observed in daily environmental, physical, or biological interactions aligned with the curriculum.