Nitrogen Cycle

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10 Terms

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first step

Nitrogen Fixation

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second step

Nitrification

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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.