IMPORTANT QUESTIONS:
- Why is improper disposal of waste a curse to environment?
- Write the common food chain of a pond ecosystem.
- What are the advantages of cloth bags over plastic bags during shopping?
- Why are crop fields known as artificial ecosystems?
- Differentiate between biodegradable and non-biodegradable substances. Cite examples.
- Suggest one word for each of the following statements/ definitions
- (a) The physical and biological world where we live in
- (b) Each level of food chain where transfer of energy takes place
- (c) The physical factors like temperature, rainfall, wind and soil of an ecosystem
- (d) Organisms which depend on the producers either directly or indirectly for food
- Explain the role of decomposers in the environment?
- Select the mis-matched pair in the following and correct it.
- (a) Biomagnification — Accumulation of chemicals at the successive trophic levels of a food chain
- (b) Ecosystem — Biotic components of environment
- (c) Aquarium — A man-made ecosystem
- (d) Parasites — Organisms which obtain food from other living organisms
- We do not clean ponds or lakes, but an aquarium needs to be cleaned. Why?
- Indicate the flow of energy in an ecosystem. Why is it unidirectional? Justify.
- What are decomposers? What will be the consequence of their absence in an ecosystem?
- Suggest any four activities in daily life which are eco-friendly.
- Give two differences between food chain and food web.
- Name the wastes which are generated in your house daily. What measures would you take for their disposal?
- Suggest suitable mechanism (s) for waste management in fertiliser industries.
- What are the by-products of fertiliser industries? How do they affect the environment?
- Explain some harmful effects of agricultural practices on the environment.