section19_review

section19_review - MIT Department of Biology 7.014...

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MIT Department of Biology 7.014 Introductory Biology, Spring 2005 Recitation Section 19 April 20-21, 2005 Quiz III Review Biogeochemical Cycles 1. What three things do all organisms need to live? How is each used? 2. Could life in the biosphere exist if one of the biogeochemical cycles is disrupted or becomes severely unbalanced? Why or why not? 3. What evidence do we have that at an earlier time in Earth’s timeline, synthesis was greater than respiration? 4. We stated that earlier on Earth S>R, and now R>S. Could life as we know it be sustained under the conditions where R>S from the beginning? Why or why not? 5. How does the NPP determine the number of trophic levels an ecosystem can support? 6. For each efficiency, choose the most likely value and justify your choice. What trends do you expect to see for each efficiency? Choose from: 5% 10% 20% 40% 60% 80% 90% can’t tell Note that below H means herbivore and C means carnivore. a.
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This note was uploaded on 01/19/2012 for the course BIOL 7.014 taught by Professor Walker during the Spring '05 term at MIT.

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section19_review - MIT Department of Biology 7.014...

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