Biol152 Spring 2015 Quiz #7 Key Please choose the one best answer for each question. 1) Which characteristic MUST an exotic species have to consider it an invasive species? a) High population growth rate b) High dispersal rate c) Negative impacts on populations of native species. d) None of the above. 2) Invasive species populations tend to grow at a fast rate because: a) They lack competitors. b) Parasites do not recognize them. c) They have higher genetic diversity then in their native habitat. d) Both a and b e) Both a and c 3) What factors were responsible for the extinction of 75% of the terrestrial snails in the Hawaiian Islands? a) The introduction of European type agricultural systems. b) The introduction of the African Giant Snail. c) The introduction of the Rosy Wolf Snail. d) Both a and c. e) All of the above. 4) What is the correct order, from highest to lowest, of stressors on the populations of endangered species? i. Pollution ii. Disease iii. Invasive Species iv. Habitat Degradation/Loss v. Overexploitation a) iv, v, iii b) iv, iii, v c) v, iii, i d) iii, iv, v e) i, iii, ii 5) With the exception of the last 150 years, for the last 800,000 years the CO2 level in the atmosphere has fluctuated between: a) 0 and 390 ppm b) 210 and 530 ppm c) 170 ppm and 280 ppm d) 170 ppm and 390 ppm6) At any given moment the greatest amount of carbon is cycling between the a) Terrestrial living components and the atmosphere b) The oceans and the atmosphere c) The oceans and geological sinks. d) The oceans and terrestrial sinks. 7) If fossil fuel burning only accounts for a small fraction of the carbon compared to the amount that is cycling between the oceans and atmosphere or the terrestrial sinks and the atmosphere, how does fossil burning contribute to increasing the level of CO2 in the atmosphere? a) The carbon in fossil fuels is different chemically. b) The rate at which fossil fuel burning inputs CO2 into the atmosphere is greater than how quickly it leaves the oceans. c) The rate at which fossil fuel burning inputs CO2 into the atmosphere is greater than how quickly the terrestrial, ocean, and geological sinks can absorb it. d) None of the above. Use you knowledge of the terrestrial part of the Carbon cycle to help you answer the following question. 8) Over the long-term (100 years) burning forests only contributes to increasing CO2 levels in the atmosphere if: a) The fires burn the entire tree. b) The fires burn at very high temperatures. c) The forests do not grow back d) All of the above. Extra Credit 9) Who is indirectly responsible for the introduction of European Starlings to North America? a) Europeans b) William Shakespeare c) Edgar Degas d) Robin Williams e) Charles Darwin