Exam 1 2010 key

Exam 1 2010 key - 1 By 2045 the global human population is...

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1. By 2045, the global human population is predicted to be a) 25 billion. d) 1.5 billion. b) 9 billion. e) 400 million. c) 6 billion. 2. Sundews are insectivorous plants living in sunny sites on sandy soils. What factor is thought to be related to the evolution of insectivory in this plant? a) Insectivory is a defense against the herbivorous flies that are typically found to be associated with sandy soils. b) The xeric nature of sandy soils creates a need for supplemental water that is provided by insectivory. c) The insects provide the primary carbon source for the sundew. d) This interaction is a symbiosis between the sundew and the insects. e) Sundew growth is limited by nitrogen availability. 3. What ecological process was responsible for a thinning of shells of the eggs of predatory birds by DDT? a) succession d) nitrification b) calcification e) biomagnification c) eutrophication 4. Which of the following has not occurred as a result of human-derived nitrogen pollution? a) addition of the primary limiting nutrient to freshwater ecosystems b) increased potential for "blue-baby" syndrome (methemoglobinemia) c) acidification of soil d) leaching of important metal cations from soils e) a decline of species diversity in montane plant communities 5. The relationship between the number of species versus the number of individuals per species in most insect communities is best characterized as a) asymptotic where the number of species reaches a plateau. b) a log-log linear relationship with a slope between 0.2 and 0.35. c) triphasic. d) lognormal. e) a negative exponential. 1
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6. Which of the following food chains is the most efficient (has the greatest amount of energy available to consumers preying on the highest trophic level in each example)? a) birch tree– squirrel – bobcat b) algae – sardine – seal c) algae – carp - salmon d) corn– endothermic vertebrate – ecothermic vertebrate e) grass – homeothermic vertebrate – endothermic vertebrate 7. In a comparison of species richness on two islands of similar size that are located at different distances from the mainland, which line best describes the immigration rate of
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Exam 1 2010 key - 1 By 2045 the global human population is...

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