the nitrogen cycle
- Created by: Faolan
- Created on: 07-11-14 17:50
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- Nitrogen Cycle
- Nitrogen is present in living organisms in Proteins. these are made up of smaller molecules called amino acids
- Plants use Nitrates from the soil to make proteins
- When animals eat plants the proteins are passed on to the animal
- Waste material such as Faeces and Ureu contain nitrogen compounds
- Nitrogen fixing- The nodules in which the nitrogen fixing bacteria live are on plants called legumes
- Nitrogen fixation allows the plants to grow in soil which does not contain much nitrates
- Denitrifying Bacteria- actually lower the nitrate level of the soil by converting nitrates to ammonia and nitrogen gas. these prefer anaerobic soils (No O) conditions (water logged soil marshy or wet fields
- Nitrifying Bacteria- Convert ammonia to the useful product nitrate (In a process called nitrification) which can be absorbed by nitrogen
- Decay Bacteria and fungi- break down dead plants and animals to produce ammonia
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