BISC120_FinalExam_Fall05_page9 - Name TA 52 Which of the...

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Unformatted text preview: Name TA 52. Which of the following would a landscape ecologist consider in designing a nature reserve? A) patterns of landscape use by humans B) human economic concerns C) possible edge effects related to human activities D) A and B only E) A . B, and C 53. A biologist measures predation rates by crab spiders on flower-visiting insects in a particular field community. Then the biologist experimentally removes as many of the spiders as she can. She discovers that predation rates remain the same but that the major predators shift from spiders to ambush bugs. Which of the following community structure models is most consistent with her findings? A) individualistic B) integrated C) rivet D) redundancy E) manipulative 54. Extinction is a natural phenomenon. It is estimated that 99% of all species that ever lived are now extinct. Why then do we say that we are now in a biodiversity crisis? A) Humans are ethically responsible for protecting endangered species. B) Scientists have finally identified most of the species on Earth and are thus able to quantify the number of species becoming extinct. C) The current rate of extinction is as much as 1.000 times higher than at any other time in the last 100,000 years. D) Humans have greater medical needs than at any other time in history, and many potential medioinai compounds are being lost as plant species become extinct. E) Most biodiversity hot spots have been destroyed by recent ecological disasters. 55. How is habitat fragmentation related to extinction? A) Leas carbon dioxide is absorbed by plants. B) More soil is subject to erosion. C) Populations of organisms in fragments are smaller and. thus, more susceptible to extinction. D) Animals are forced out of habitat fragments. E) Fragments generate silt that negatively affects drainages. Tntai nnints this name....
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