Across
- 4. steps or levels in a food chain.
- 5. accumulation of toxic substances in organisms in every successive trophic level.
- 8. class of organisms capable of producing own food.
- 11. animals obtaining energy from green plants.
- 12. a sequential Process of organisms feeding on one another.
- 13. microscopic aquatic plants.
Down
- 1. the non living components of an ecosystem.
- 2. a process of managing hospital wastes by burning them.
- 3. functional unit of environment.
- 6. an eye disease caused by ozone depletion.
- 7. the trivalent oxygen.
- 9. substances easily broken down by decomposers.
- 10. saprophytic microorganisms.