1. KEY CONCEPT Life in an ecosystem requires a source of energy.

2. Prefixes Auto- ? Hetero- ? Homo- ? Photo- ? Chemo- ? Herbi- ? Carni- ? Omni- ? Hydro- ?

3. Prefixes Auto- Self Hetero- Different Homo- Same Photo- Light Chemo- Chemical Herbi- Plants Carni- Meat Omni- All Hydro- Water

4. Producers provide energy for other organisms in an ecosystem. Name three producers. Producers get their energy from non-living resources. Producers are also called autotrophs because they make their own food.

6. KEY CONCEPT Food chains and food webs model the flow of energy in an ecosystem.

7. DESERT COTTONTAIL GRAMA GRASS HARRIS’S HAWK A food chain is a model that shows a sequence of feeding relationships. Why does “chain” fit this idea? A food chain links species by their feeding relationships. A food chain follows the connection between one producer and a single chain of consumers within an ecosystem.

8. Create your own food chain Beginning with a producer and including at least three organisms, give an example of a food chain.

10. Carnivores eat only animals.

11. Omnivores eat both plants and animals.

12. Detritivores eat dead organic matter.

14. Secondary consumers are carnivores that eat herbivores. Name one example.

15. Tertiary consumers are carnivores that eat secondary consumers. Name one example.

17. A food web shows a complex network of feeding relationships.

18. KEY CONCEPT Matter cycles in and out of an ecosystem.

19. precipitation condensation transpiration evaporation surface runoff lake water storage in ocean groundwater seepage Water cycles through the environment. Explain how. The hydrologic, or water, cycle is the circular pathway of water on Earth. Organisms all have bodies made mostly of water.

20. Elements essential for life also cycle through ecosystems. Name one. A biogeochemical cycle is the movement of a particular chemical through the biological and geological parts of an ecosystem.

22. Carbon is emitted by the burning of fossil fuels.

25. Phosphorus moves through the food web and returns to the soil duringdecomposition.

26. Phosphorus leaches into groundwater from the soil and is locked in sediments.

29. How do the activities of a keystone species affect the biodiversity of an ecosystem? A. They increase biodiversity. B. They decrease biodiversity. C. They have no effect on biodiversity. D. Biodiversity remains the same but the species change. Correct Answer = A Which is a characteristic of an ecosystem in approximate equilibrium? A. The kinds of organisms do not change. B. Biotic factors do not change. C.Abiotic factors do not change. D. The total number of organisms do not change.

30. How do the activities of a keystone species affect the biodiversity of an ecosystem? A. They increase biodiversity. B. They decrease biodiversity. C. They have no effect on biodiversity. D. Biodiversity remains the same but the species change. Correct Answer = A Which is a characteristic of an ecosystem in approximate equilibrium? A. The kinds of organisms do not change. B. Biotic factors do not change. C.Abiotic factors do not change. D. The total number of organisms do not change. Correct Answer = D

32. Consumers are organisms that must consume other organisms for energy.

33. A food chain links organisms by their feeding relationships connecting a producer to a single line of consumers.

34. A food web shows complicated feeding relationships

35. Water, nitrogen, oxygen, phosphorous, and carbon all cycle through ecosystems.