✨ Flashcards — Our Environment 🌏
Here is a set of flashcards for quick revision of 📗 Our Environment — Class 10 CBSE.
You can even copy these into slides, apps like Quizlet, or print them!
🔷 Flashcard 1
Q: What is an ecosystem?
An ecosystem is the interaction of living (biotic) and non-living (abiotic) components in a specific area.
Example: Pond, forest, desert.
🔷 Flashcard 2
Q: What is a food chain?
A sequence of organisms where one is eaten by the next.
Example: Grass → Grasshopper → Frog → Snake → Hawk
🔷 Flashcard 3
Q: What is a food web?
A network of interconnected food chains in an ecosystem.
🔷 Flashcard 4
Q: Define trophic level.
The position an organism occupies in a food chain.
🔷 Flashcard 5
Q: What is the 10% Law?
Only 10% of energy is transferred from one trophic level to the next; rest is lost as heat.
🔷 Flashcard 6
Q: Why is energy flow in an ecosystem unidirectional?
Because energy comes from the Sun, flows through organisms, and is lost as heat — it doesn’t return to the Sun.
🔷 Flashcard 7
Q: What is the role of decomposers?
Decomposers break down dead organisms and recycle nutrients back to the environment.
🔷 Flashcard 8
Q: What is ozone and why is it important?
Ozone (O₃) in the stratosphere protects Earth from harmful UV rays.
🔷 Flashcard 9
Q: What are CFCs and why are they harmful?
Chlorofluorocarbons are chemicals that destroy the ozone layer.
🔷 Flashcard 10
Q: What is the difference between biodegradable and non-biodegradable waste?
Biodegradable: Decomposed by microbes (e.g., food, paper).
Non-biodegradable: Cannot decompose easily (e.g., plastics, metals).