ch22_take_home

Living in the Environment: Principles, Connections, and Solutions (with CD-ROM and InfoTrac)

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Ch 22 Take Home Test Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. ____ 1. If there are 100 million different species, the background rate of extinction is about _____ species per year. a. 30 b. 100 c. 300 d. 1000 ____ 2. In 1996, conservation biologists estimate that the rate of extinction was _____ than the estimated natural background extinction rate. a. ten times lower b. ten times higher c. hundreds times higher d. thousands times higher ____ 3. Habitat loss may result in extinction over several generations. Which feature of a model is illustrated by this example? a. a positive feedback loop b. a negative feedback loop c. a delay d. an accumulation ____ 4. Mathematical models indicate that organisms most vulnerable to habitat loss may be the a. producers. b. herbivores. c. decomposers. d. top competitors. ____ 5. The blue whale is extinction prone for all of the following reasons except a. low reproduction rate. b. feeding at the top trophic level. c. specialized feeding habits. d. fixed migratory patterns. ____ 6. The timber wolf is extinction prone because of its a. large size.
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b. specialized breeding areas. c. fixed migratory patterns. d. preying on livestock. ____ 7. A population size dropping toward a critical population density increases the chances of a. a larger gene pool and inbreeding. b. a larger gene pool and outbreeding. c. a smaller gene pool and inbreeding. d. a smaller gene pool and outbreeding. ____ 8. If you eat cashews, avocados, or bananas, you can thank a a. bat. b. manatee. c. bee. d. hummingbird. ____ 9. Biologists claim that species have a. ecological value. b. economic value. c. medical and scientific value. d. all of these answers. ____ 10. Wild plant species have economic value as a. fiber. b. dyes. c. oils. d. all of these answers. ____ 11. Economic services performed by wild species include a. nitrogen-fixation. b. production of medicines. c. pollination of crops. d. all of these answers. ____ 12. The ecosystem service least likely to be provided by wild species is a. recycling nutrients and decomposition of organic wastes.
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b. diversifying the gene pool. c. balancing all the impacts of human activities. d. moderating Earth's climate. ____ 13. You are studying species diversity in the Caribbean islands. Which island would you expect to have the most number of species? a. a large island near the mainland b. a large island far removed from other sites c. a medium-sized island is the middle of an island chain d. a small island far removed from other sites ____ 14. Which of the following is false? Habitat islands a. are wildlife preserves set aside to sustain endangered species. b.
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This document was uploaded on 12/20/2010.

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ch22_take_home - Ch 22 Take Home Test Multiple Choice...

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