Photosynthesis3

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Photosynthesis3

  1. 1. Photosynthesis The Big Picture
  2. 2. Carbon cycle <ul><li>Process by which carbon moves from organic t inorganic compounds and back </li></ul><ul><li>Producers convert inorganic carbon (CO2) into organic carbon compounds (glucose) </li></ul><ul><li>Primary Consumers obtain organic compounds by eating producers </li></ul><ul><li>Secondary consumers obtain organic carbon by eating primary consumers </li></ul><ul><li>Cellular Respiration by producers and consumers return CO2 to atmosphere </li></ul>
  3. 3. <ul><li>In the natural carbon cycle, there are two main processes which occur </li></ul><ul><ul><li>Photosynthesis </li></ul></ul><ul><ul><li>metabolism </li></ul></ul><ul><li>  </li></ul>
  4. 8. Carbon in Ocean and Sediments <ul><li>CO2 is slightly soluble </li></ul><ul><li>Can be absorbed into water </li></ul><ul><li>Some of the dissolved CO2 remains in the water, the warmer the water the less carbon dioxide remains in the water </li></ul><ul><li>Some CO2 is used by algae and phytoplankton through the process of photosynthesis  </li></ul><ul><li>Coral and shelled marine organisms take up CO2 from the water and convert it into calcium carbonate </li></ul><ul><ul><li>When these organisms die pieces of shells/coral fall to ocean floor and make sediments </li></ul></ul><ul><li>The carbonate sediments are constantly being formed and redissolved in the bottom of the ocean </li></ul><ul><li>Over long periods of time, the sediments may be raised up as dry land or into mountains </li></ul><ul><li>This type of sedimentary rock is called limestone </li></ul><ul><li>The carbonates can redissolve releasing carbon dioxide back to the air or water </li></ul>
  5. 11. Humans and the Carbon Cycle <ul><li>Combustion of any type of fossil fuel, which may include oil, coal, or natural gas </li></ul><ul><li>Fossil Fuels  formed thousands of years ago from plant or animal remains that were buried, compressed, and transformed into oil, coal, or natural gas </li></ul><ul><li>This carbon is said to be &quot;fixed&quot; in place and is essentially locked out of the natural carbon cycle </li></ul><ul><li>Humans intervene during by burning the fossil fuels </li></ul><ul><ul><li>During combustion in the presence of O2, CO2 and water molecules are released into the atmosphere </li></ul></ul>
  6. 12. Photosynthesis and Global Climate <ul><li>CO2 makes up 0.03 percent of Earth’s atmosphere </li></ul><ul><ul><li>300 parts per million </li></ul></ul><ul><li>Greenhouse Effect </li></ul><ul><ul><li>CO2 traps heat from sun in Earth’s atmosphere (otherwise it would escape into space) </li></ul></ul><ul><ul><li>Not a bad thing </li></ul></ul><ul><ul><li>Keeps world climate warm enough to sustain life </li></ul></ul><ul><ul><li>Keeps Earth 10% warmer than it would be without CO2 </li></ul></ul><ul><li>Currently CO2 in atmosphere is rising </li></ul><ul><ul><li>360 parts per million </li></ul></ul><ul><li>Burning fossil fuels </li></ul><ul><li>Deforestation </li></ul><ul><li>Natural Causes </li></ul><ul><ul><li>Photosynthesis </li></ul></ul><ul><ul><li>Cellular respiration </li></ul></ul><ul><ul><li>Decomposition </li></ul></ul><ul><ul><li>Volcanic eruptions </li></ul></ul><ul><ul><li>Ocean/limestone </li></ul></ul><ul><li>Global Warming </li></ul><ul><ul><li>Overall rise in Earth’s average temperature over a period of time </li></ul></ul>
  7. 13. Class Work: Due at 8:20 am TODAY!!! <ul><li>NEAT </li></ul><ul><li>Skip lines between questions </li></ul><ul><li>p. 174 #1-6 Q&A </li></ul><ul><li>p. 174-175 #7-24 complete sentence answers </li></ul><ul><li>STUDY for PHOTOSYNTHESIS TEST </li></ul>

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