Nitrogen Cycle Mind Map

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  • The Nitrogen Cycle.
    • Nitrogen Fixation
      • These have  a mutualistic relationship with the plant, the plant gains nitrogen cmpounds in the form of ammonia, the bacteria gets carbohydrates and oxygen is controlled.
      • The enzyme nitrogenase is used synthesise ammonia from N2 + H. 16 ATP is needed for this, which comes from NADPH. The bacteria needs oxygen for respiration, however Oxygen is also a competitve inhibitor for nitrogenase, meaning it must be limited and controlled (by the nodule.)
      • Bacteria such as Rhizobium live in the root nodules of plants (e.g. pea)
      • Other processes such as the Haber Process, fertilisers, and lightning can also "fix" Nitrogen from the atmosphere.
    • Decompostition (Ammonification)
      • Saprobiotic.
      • At each trophic level, organic compounds return to the environment, mainly by excretion.
      • The decompsers then break down the waste products into ammonia using extracellular digestion- they excrete enzymes onto the waste and the digest it.
    • Nitrification
      • Bacteria of the genus nitrosomonas oxidise ammonia to nitrites (NO2-)
      • Nitrosomonas and nitrobacter.
      • Nitrifying bacteria.
      • Bacteria of the genus nitrobacter oxidise the nitrites to nitrates (NO3-)
    • Denitrification
      • Pseudomonas - anaerobic bacteria.
      • Closes the cycle and reduces nitrates to nitrogen gas which returns to the atmosphere.
      • Pseudomonas live deep in the soil, and like waterlogged conditions. They use Nitrogen instead of Oxygen as the final electron acceptor in respiration.
  • Decompostition (Ammonification)
    • Saprobiotic.
    • At each trophic level, organic compounds return to the environment, mainly by excretion.
    • The decompsers then break down the waste products into ammonia using extracellular digestion- they excrete enzymes onto the waste and the digest it.
  • Nitrification
    • Bacteria of the genus nitrosomonas oxidise ammonia to nitrites (NO2-)
    • Nitrosomonas and nitrobacter.
    • Nitrifying bacteria.
    • Bacteria of the genus nitrobacter oxidise the nitrites to nitrates (NO3-)

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