Our Environment — Flashcards
Karnataka Board · Class 10 · Science
20 flashcards for Our Environment (Karnataka Board Class 10 Science) to test yourself on key terms and facts. Sample: "What is an ecosystem? Give two.
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What is an ecosystem? Give two examples.
Answer
An ecosystem is a system where all living organisms (biotic components) interact with each other and with non-living components (abiotic components) like temperature, rainfall, soil, etc. Examples: A …
Why do food chains generally have only 3-4 trophic levels?
Answer
Only 10% of energy is transferred from one trophic level to the next (10% rule). The remaining 90% is lost as heat, used in metabolism, or for movement. After 3-4 levels, very little usable energy rem…
A farmer notices his crops are being damaged by insects. He uses pesticides. Trace how these chemicals might affect a food chain: Crop → Grasshopper → Frog → Snake → Eagle.
Answer
Pesticides accumulate in crops → Grasshoppers consume pesticides → Frogs eat many grasshoppers (higher concentration) → Snakes eat frogs (even higher) → Eagles have maximum concentration. This is biol…
What happens when you leave dead fish and plants in an aquarium without cleaning?
Answer
Decomposer bacteria and fungi break down dead organisms into simpler substances. Without proper cleaning, these accumulate, making water toxic for living fish. In nature, decomposers recycle nutrients…
How does ozone (O₃) form in the upper atmosphere?
Answer
UV radiation splits oxygen molecules (O₂) into free oxygen atoms: O₂ → O + O. These free atoms then combine with other O₂ molecules to form ozone: O + O₂ → O₃. This ozone shields Earth from harmful UV…
A plastic bag takes 400-1000 years to decompose, while a banana peel takes 3-5 weeks. Explain why.
Answer
Banana peel is biodegradable - bacteria have enzymes that can break down its organic compounds. Plastic is non-biodegradable - bacteria lack specific enzymes to break down synthetic polymers, so only …
What are the three main groups of organisms in any ecosystem based on nutrition?
Answer
1. Producers (autotrophs) - green plants that make food through photosynthesis 2. Consumers (heterotrophs) - animals that depend on producers directly or indirectly 3. Decomposers - bacteria and fungi…
Why is energy flow in ecosystems called 'unidirectional'?
Answer
Energy flows in one direction only - from sun to producers to consumers to decomposers. Energy cannot flow backward to previous trophic levels. Once used by an organism, energy is lost as heat and can…
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Sources & Official References
- Karnataka SSLC — kseeb.kar.nic.in
- Dept of Pre-University Education, Karnataka
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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