12. Consider the global water cycle depicted in the figure above. Which one of t
ID: 279174 • Letter: 1
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12. Consider the global water cycle depicted in the figure above. Which one of the reserves contains the smallest percentage of global water? A) rivers and lakes B) polar ice caps C glaciers Datmosphere 13. The goal of restoration ecology is to A) replace a ruined ecosystem with a more suitable ecosystem for that area B) return degraded ecosystems to a more natural state C) manage competition between species in human-altered ecosystems D) prevent further degradation by protecting an area with park status 14. Which of the following would be considered an example of bioremediation? ecosystem to increase nitrogen availability B) using a bulldozer to regrade a strip mine C) dredging a river bottom to remove contaminated sediments D) adding seeds of a chromium-accumulating plant to soil contaminated by chromium 15. Acid precipitation lowered the pH of soil in a terrestrial ecosystem that supported a diverse community of plants and animals. The decrease in pH eliminated all nitrogenfixing bacteria populations in the area. Which prediction most accurately reflects the impact this will have on the community? A) Since phosphorus can replace nitrogen as an essential nutrient, the impact will be minimal. B) Plants can obtain the nitrogen necessary for growth from the atmosphere, but bacterial communities will be negatively impacted. C) Primary producers will suffer from nitrogen deficiency and the entire community will experience a decrease in carrying capacity D) The decrease in pi actually increases the availability of soil nutrients, so other nutrients that were less available cause an increase in primary production and an increase in biomass at other trophic levelsExplanation / Answer
12.
D.atmosphere
Only thousandth of 1% of water on the earth is available in the atmosphere as a water vapour.
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