The Nitrogen Cycle

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  • The Nitrogen Cycle
    • Nitrogen is recycled in the air
    • The atomosphere contains 78% nitrogen gas
    • Nitrogen is needed for making proteins for growth
    • Plants get their nitrogen from the soil
      • Nitrogen in the air has to be turned into nitrates before the plant can use it
    • Nitrogen compounds are passed along food chains and webs
    • Decomposers break down proteins into ammonia
      • This returns the nitrogen compounds to the soil
    • Nitrogen fixation is the process of turning N2 in the air ointo nitrogen compounds which plants can use
      • Lightning - The energy allows nitrogen to react with oxygen
      • Nitrogen fixing bacteria in the soil
        • Some live in soil but others live in nodules on the roots of legume plants
          • They have a mutualistic relationship
            • Bacteria gets food from the plant
            • The plant gets nitrogen compounds
    • 4 Types of Bacteria involved in the Nitrogen Cycle:
      • Decomposers
        • Decompose proteins and urea and turn them into ammonia
      • Nitrifying bacteria
        • Turns ammonia into nitrates
      • Nitrogen - fixing bacteria
        • Turns N2 into nitrogen compounds that plants can use
        • Some live in soil but others live in nodules on the roots of legume plants
          • They have a mutualistic relationship
            • Bacteria gets food from the plant
            • The plant gets nitrogen compounds
        • Nitrogen fixing bacteria in the soil
        • Denitrifying bacteria
          • Turns nitrates into N2 gas

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