B1 Weak Topics- Nitrogen cycle

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How is nitrogen converted into nitrate compounds?
Nitrogen gas is converted to nitrate compounds by nitrogen-fixing bacteria in soil or root nodules. Lightning also converts nitrogen gas to nitrate compounds.
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How is Ammonia converted to nitrates?
Ammonia is converted to nitrates by nitrifying bacteria in the soil.
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What happens in the nitrogen cycle after nitrogen is converted into nitrate compounds for plants?
Plants absorb nitrates from the soil and use these to build up proteins. The plant may be eaten by an animal, and its biomass used to produce animal protein.
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What happens to urea and egested materials?
Urea and egested material is broken down by decomposers. This results in nitrogen being returned to the soil as ammonia.
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How does nitrogen return to the atmosphere after an animal dies?
Decomposers also break down the bodies of dead organisms resulting in nitrogen being returned to the soil as ammonia. In some conditions denitrifying bacteria in the soil break down nitrates and return nitrogen to the air.
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Other cards in this set

Card 2

Front

How is Ammonia converted to nitrates?

Back

Ammonia is converted to nitrates by nitrifying bacteria in the soil.

Card 3

Front

What happens in the nitrogen cycle after nitrogen is converted into nitrate compounds for plants?

Back

Preview of the front of card 3

Card 4

Front

What happens to urea and egested materials?

Back

Preview of the front of card 4

Card 5

Front

How does nitrogen return to the atmosphere after an animal dies?

Back

Preview of the front of card 5

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