Nitrogen Cycle
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Last updated 3:11 AM on 12/22/25
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10 Terms
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first step
Nitrogen Fixation
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second step
Nitrification
3
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third step
Assimilation
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fourth step
Ammonification
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fifth step
Denitrification
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what is Nitrogen Fixation
Nitrogen gas (N₂) from the air is changed into ammonia (NH₃) by bacteria or lightning.
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What is Nitrification
Ammonia is converted into nitrites (NO₂⁻) and then nitrates (NO₃⁻) by bacteria.
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What is Assimilation
Plants absorb nitrates from the soil to make proteins and DNA.
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What is Ammonification
Decomposers turn dead plants and animals back into ammonia.
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What is Denitrification
Bacteria convert nitrates back into nitrogen gas (N₂) that goes into the atmosphere.
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