Nitrogen Cycle

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Nitrogen Cycle

  1. 1. Launch <ul><li>Reviewing what you know about the oxygen and carbon cycles, what sort of things might you guess you’ll find in the nitrogen cycle? </li></ul><ul><li>How did yesterday with the sub go? </li></ul><ul><li>“ There is never a penalty for guessing even if you have no idea what the answer might be….” </li></ul>
  2. 2. The Nitrogen cycle <ul><li>October 23, 2009 </li></ul>
  3. 3. Nitrogen. It’s Everywhere! <ul><li>About 78% of the Earth’s atmosphere is composed of nitrogen </li></ul>
  4. 4. Nitrogen Fixation Plants need nitrogen in order to grow, but they cannot use the N 2 in the atmosphere - It must be FIXED first
  5. 5. Bacteria do this Fixation Bacteria in the soil and water convert N 2 to NH 4 + (ammonia) = NITROGEN FIXATION
  6. 6. This fixed nitrogen can be used by plants to make DNA and Proteins We get our nitrogen by eating plants. We use this nitrogen to make our DNA and proteins
  7. 7. When bacteria detect there is too much nitrogen in the soil, they denitrify it = DENITRIFICATION DENITRIFICATION turns nitrogen back into a gas
  8. 8. Back to the soil When plants and animals die, they DECOMPOSE and are broken down by DECOMPOSERS (bacteria and fungi) DECOMPOSERS add nitrogen to the soil

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