practice exam 2 answers-444

practice exam 2 answers-444 - Practice Exam 2 answers...

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Practice Exam 2 answers Multiple choice 1. a 2. e 3. d 4. c 5. b 6. b 7. e 8. b 9. a 10. a 11. c 12. a 13. d 14. a 15. e 16. b 17. b 18. d 19. a 20. e 21. d 22. d 23. e 24. a 25. e 26. e 27. a 28. d 29. d 30. a
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31. This figure, shown in lecture, represents data on four species (kelp, sea urchins, sea otters, and killer whales) that form a food chain in an Alaskan kelp forest. a) What is the difference between the structure of the community in 1972 vs. its structure in 1997 (1)? A tertiary (higher trophic level) consumer has been added (i.e. killer whales) b) Describe the effects, both direct and indirect, of this change in community structure (6) Killer whales have the direct effect of lowering sea otter populations. This has the indirect effect of increasing sea urchin populations, which in turn reduce kelp density.
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c) Which species in this community would be referred to as a keystone species (1)? The sea otter d) The kelp forest community contains many more species than are shown in this food chain. Explain the likely effect of the change in kelp density on the diversity of this community (2)? Strong reduction in kelp density will have negative effects on primary consumers feeding on kelp, which will, in turn, reduce the populations of the secondary consumers that feed on the primary consumers.
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32. This experiment, described in lecture and your textbook was designed to test aspects of altruistic behavior in prairie dog colonies (coteries). a) Describe the results of this experiment with respect to the relative proportion of alarm
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practice exam 2 answers-444 - Practice Exam 2 answers...

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