section14_ak

section14_ak - MIT Department of Biology 7.014 Introductory...

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MIT Department of Biology 7.014 Introductory Biology, Spring 2005 Recitation Section 14 Answer Key March 30-31, 2005 Biogeochemical Cycles—Energy Flows A. Carbon and Energy in a Food Web. Steady State. Plants R A P gross 1 2 P B B = biomass D = detritus I = ingestion A = assimilation P = production R = respiration 3 4 5 6 7 8 9 10 R H R H R H D A I F B Herbivore Carnivore F B B D D D I A P P 11 12 14 15 16 F = feces I = A + F A = R + P Detritivore 13 1. What do the arrows in the diagram represent? The arrows in the diagram represent the flow of carbon and energy through the trophic levels of an ecosystem per unit time. 2. Why are the arrows of different sizes? The width of the arrow represents the amount of carbon (energy) in the ecosystem at a particular point. 3. How does the energy enter the ecosystem? Is it converted in any way before it is used in the ecosystem? Energy enters the ecosystem as sunlight which is converted to chemical energy by photosynthesis in plants.
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section14_ak - MIT Department of Biology 7.014 Introductory...

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