The Nitrogen Cycle Flashcards

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What is the nitrogen cycle?

The nitrogen cycle is the process by which nitrogen is converted into different chemical forms and moves through the environment.

How is nitrogen fixed into a usable form for plants?

Nitrogen-fixing bacteria in leguminous plants and lightning convert nitrogen gas (N2) into nitrates, which plants can absorb.

What is the Haber process?

The Haber process converts nitrogen gas into ammonia, used in fertilisers, which nitrifying bacteria can then convert into nitrates for plants.

How do plants absorb and use nitrogen?

Plants absorb nitrates from the soil and convert them into proteins and essential compounds for growth.

What happens to nitrogen when animals eat plants?

Animals take in nitrogen from plant proteins, which they use to build their tissues.

How is nitrogen returned to the atmosphere?

Denitrifying bacteria in low-oxygen soil convert nitrates back into nitrogen gas, which returns to the air.

Revision Notes
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