From chapter Our Environment
1. What is the role of decomposers in the ecosystem? Give two examples.
Answer: Decomposers break down dead organisms and recycle nutrients into the soil, maintaining ecosystem balance.
Examples: Bacteria, fungi.
2. Why is the ozone layer important? Name one chemical responsible for its depletion.
Answer: The ozone layer absorbs harmful UV rays, protecting life on Earth.
Chemical responsible: Chlorofluorocarbons (CFCs).
3. What will happen if all the herbivores are removed from an ecosystem?
Answer:
Plant population will increase uncontrollably.
Carnivores will starve and may become extinct.
The ecosystem will become imbalanced.
4. What is a food chain? Explain with an example.
Answer: A food chain is a sequence showing energy flow between organisms.
Example: Grass → Grasshopper → Frog → Snake → Eagle.
5. Why is it difficult to dispose of plastic waste? Suggest two eco-friendly alternatives.
Answer: Plastic is non-biodegradable and pollutes soil and water.
Alternatives:
1. Cloth or jute bags.
2. Metal or glass containers.
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