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GCSE Combined Science · key term
A nitrogen-containing mineral ion, , absorbed by plant roots and used to make amino acids and proteins.
Used by Edexcel
Paper 1, Paper 2
Revise: The nitrogen cycle and nitrate availabilityAnother group, nitrifying bacteria, converts ammonium compounds into nitrites and then nitrates. This process is called nitrification. It makes nitrogen available in a form that plant roots can absorb.
Distinguish nitrogen-fixing bacteria, which use atmospheric nitrogen, from nitrifying bacteria, which convert ammonium compounds into nitrates.
Denitrifying bacteria reduce nitrate availability: they convert nitrates into nitrogen gas, especially in oxygen-poor, waterlogged soil.
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