bio ch 41 bs

bio ch 41 bs - Forms of carbon in ecosystem o CO2-...

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09/12/2007 01:16:00 A field contains approximately 1000 kilocalories of energy in grass, which is  eaten by crickets which  are eaten by birds. Approximately how many kilocalories could  be in the crickets which live in this field? 1. 10 2. 90 3. 100 answer 4. 900 5.10000 Nutrient  Cycling Same pool of nutrients supports all life o Past, present and future Cycles move nutrients o From nonliving to living o From environment to organisms Carbon and Nitrogen Cycles Majority of these nutrients found in the atmosphere and oceans Atomospheric nutrients get incorporated into living organisms o Carbon- photosynthesis o Nitrogen- nitrogen fixation Nutrients are returned to the environment o Carbon- respiration (all organisms) o Nitrogen-decomposers and denitrifying bacteria Carbon Cycle
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Unformatted text preview: Forms of carbon in ecosystem o CO2- atmosphere o Bicarbonate H2CO3 Dissolved in the ocean CaCo3- Shells, limestone Organic matter o Carbohydrates, proteins, lipids. . o Fossil Fuels Figure 41-8 Greenhouse Effect Figure41-5 Global qwarming Parallels CO2 Increases (Figure 41-6) Co2 levels Through times Nitrogen Cycle Forms of nitrogen in ecosystems o N2-atmosphers o NO3 and NH3-oceans lakes soils- nitrate and amonia o Organic matter-amino acids proteins and nucleic acids The nitrogen Cycle (Figure 41-9) The Dead Zone Region where I2 levels drop below range that can support life N fertilizes producers Producers die Decomposers eat and use up O2 09/12/2007 01:16:00 09/12/2007 01:16:00...
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bio ch 41 bs - Forms of carbon in ecosystem o CO2-...

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