Biology A-Level
nitrogen fixation
What nitrogen fixation means in Biology A-Level, as defined for AQA.
Definition of nitrogen fixation
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Reference: AQA
Nitrogen-fixing bacteria, free-living or mutualistic in legume root nodules, reduce atmospheric nitrogen gas to ammonia.
Topics that use nitrogen fixation
- Nutrient cycles (A-level only) (AQA A-Level)
Related terms
- algal bloom
- ammonification
- artificial fertilisers
- decomposers
- denitrification
- eutrophication
- extracellular digestion
- ion availability
Using nitrogen fixation in the exam
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