Nitrogen Cycle Mind Map
- Created by: Chloe
- Created on: 29-11-12 12:22
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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.
- Nitrogen Fixation
- 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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