Science 7 Final Review

1. Science 7 Final Review Part A Unit 1 Interactions & Ecosystems

2. Unit 1: Interactions & Ecosystems • What are the 4 needs of living things?

3. Food, water, suitable habitat, gas exchange

4. What are adaptations? Example?

5. Inherited characteristics that help an organism survive and reproduce in their environment. • Example: long bill, robin’s feet, tiger’s stripes

6. 3 types of symbiosis

7. Mutualism ex. Shark & • Commensalism ex. Orchid & tree trunk • Parasitism ex. Tapeworm & human

8. Human impacts on Ecosystems • What are natural resources?

9. Materials and products that are found in nature

10. What is the difference between needs and wants?

11. Need- must have it to survive • Want- a luxury you could live without

12. Environmental choices • What is an ecological footprint?

13. Total area of land and water needed to supply what we use and absorb our wastes

14. What are the 3 R’s?

15. Reduce • Reuse • Recycle

16. Interactions of Organisms • What is the difference between Abiotic and Biotic?

17. Abiotic- non-living • Biotic- living

18. What is the difference between food webs and food chains?

19. A food web is more complex than a food chain • A food chain starts with a producer

20. Describe the difference between producers, consumers, and decomposers

21. Producers- produce food energy for themselves • Consumers- eat food made by consumers • Decomposers- break down dead or waste material

22. What are herbivores, omnivores, and carnivores?

23. All are consumers • Herbivores only eat plants • Omnivores eat plants and animals • Carnivores only eat animals

24. What is a pyramid of numbers?

25. Shows the biomass or number of organisms at each level of the food chain. Producers form the base.

26. What is biomass?

27. Biomass is the total mass of all the organisms in an ecosystem.

28. What is the difference between scavengers and decomposers?

29. Scavengers eat dead or decaying plants or animals • Decomposers live inside dead or decaying plants or animals

30. Carbon Cycle

32. Water Cycle

34. What is pollution?

35. The different types of harmful materials that are released into the environment through human activities

36. What is bioaccumulation?

37. The movement of pollutants through levels of a food chain so that greater quantities are retained with movement up the food chain

38. Changes in the Ecosystem • How does primary succession differ from secondary?

39. Primary is from bare rock • Secondary from where there was organisms before

40. When should we do Biological instead of chemical pest control?

41. When we only want to kill some organisms

42. Why are introduced species a big problem in North America?

43. They can kill native species (take over habitat and food)

44. Monitoring • What are the 4 types of ecosystem monitoring?

45. Physical • Environmental • Chemical • Biological

46. Why are indicator species important?

47. They help monitor overall health of the environment

48. Why is it necessary to get good baseline data?

49. To know changes that are happening

50. What is an Environmental Impact Assessment?