mid term review

Mid term review - be absorbed by animals and plants This complex process can be carried out by bacteria in the ground in association with

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28) Air is about 78% nitrogen, but plants cannot directly use the nitrogen from the air. Explain why not in layperson’s terms. Then describe two ways in which plants do get nitrogen Nitrogen from the atmosphere cannot be used directly for animals and plants because it exist in form of N 2, which is impossible for any living things to absorb a. One way that involves humans: People can use commercial fertilizer in which atmospheric nitrogen is combined with hydrogen to form ammonia. Then ammonia can be applied directly to crop for it to get nitrogen. The process of making nitrogen requires methane and coal, so it is not very ideal to the environment. b. One way that does not involve humans: Nitrogen-fixation is one way to convert atmospheric nitrogen in to “fixed” nitrogen that can
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Unformatted text preview: be absorbed by animals and plants. This complex process can be carried out by bacteria in the ground in association with “legumes-nitrogen fixing” plants like fava beans, clover to enrich the soil with nitrogen. 53) Explain and put in context Yoram’s statement that “I’m not worried that we might be running out of coal, I’m worried that we might not be running out of coal.” • Yoram used the class metaphor of the invisible hand for “ not worried that we might be running out of coal ”. It means that the ‘invisible hand” will tell us that we will never run out of coal. • Yoram used the class metaphor of the tragedy of the commons for “ worried that we might not be running out of coal”...
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This note was uploaded on 02/13/2010 for the course ENG 189 taught by Professor Welbeck during the Spring '10 term at Eastern Oregon.

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