1. Review Questions Write your answer, and nothing else, on the white board. Work together with people around you. Hold up your answer, but don’t say it too loudly.

2. In a forest ecosystem, the following factors are present. Sort these into biotic versus abiotic: Soil Trees Squirrels Sunlight Rainfall Temperature Birds Mushrooms Insects rocks

3. In a aquatic ecosystem, the following factors are present. Sort these into biotic versus abiotic: Water Fish dissolved salt dissolved oxygen Algae Bacteria pH of water lobsters

4. Based on the food web above, name one population that might increase if a disease killed half of the hawk population. Squirrels or rabbits

5. Which of the following is true? A) a community contains several ecosystems B) an organism contains several communities C) a community contains several populations D) a population contains several communities C

6. Which trophic level in a food chain contains the most energy? A) producers B) primary consumers C) secondary consumers D) tertiary consumers A) producers

7. This ecological pyramid contains hawks, snakes, rats, and plants. If 100 snakes are present in an ecosystem, how many rats are likely to be present? 1000 (10% rule)

8. A) plantsC) snakes B) ratsD) hawks C Which organisms are the secondary consumers in this pyramid?

9. Create an example of a food chain based on this ecological pyramid. plants  rats  snakes  hawks

10. False True or False A poisonous substance that accumulates in living tissue is sprayed on the plants. This substance will accumulate more in rats than in snakes.

11. Which of the following is most likely to be a decomposer? A) a species of fungi B) a species of insects C) a species of trees D) a species of birds A

12. Which of the following is an example of primary ecological succession? A) a forest fire kills a population of trees B) a glacier melts, exposing bare rock C) disease causes extinction of a bird species D) removal of predators increases prey population B

13. Which of these shows the correct definitions of the symbiotic relationship? B RelationshipOrganism #1Organism #2 A)Parasitismbenefitsunaffected B)Commensalismbenefitsunaffected C)Parasitismbenefits D)Commensalismharmedbenefits

14. Which of these shows the correct definitions of the symbiotic relationship? C RelationshipOrganism #1Organism #2 A)Mutualismbenefitsunaffected B)Parasitismbenefitsunaffected C)Mutualismbenefits D)Parasitismharmedunaffected

15. According to the food web, which population might decrease in size if trout population was reduced by human activity? bear or heron

16. If a large number of finches migrated into this ecosystem, which population would initially decrease? insects

17. Name an organism that is a primary consumer in this food web. Rabbits, insects, or small fish