The Nitrogen Cycle

How animals get the nitrogen they need

• from the air they breathe
• from the water they drink
• from the food they eat
• from the Sun

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Organisms that need nitrogen to survive

• only plants
• only animals
• only bacteria
• all living organisms

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Organism that breaks down dead plants & animals and releases nitrogen back into atmosphere

• bacteria
• plants
• animals
• producers

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How plants get the nitrogen they need

• from the air
• from the soil or water in which they live
• from the Sun
• from broken down rocks

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What converts nitrogen gas into a usable form for plants and animals?

• bacteria

• rain

• fungi

• car exhaust

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The process in which nitrogen circulates and is recycled is called

• The nitrogen cycle

• The carbon cycle

• The water cycle

• The phosphorus cycle

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Gas that makes up 78% of our atmosphere.

• Oxygen

• Nitrogen

• Hydrogen

• Carbon Dioxide

What is the formula for atmospheric nitrogen?

• N

• N₂

• NH₃

• NO₃

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According to this diagram, plants absorb

• nitrates

• nitrogen fixing bacteria

• animals

• decomposers

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A correct path that nitrogen could take would be

• air -> animals -> plants -> bacteria

• animals -> air -> bacteria -> plants

• bacteria -> air -> plants -> animals

• air -> bacteria -> plants -> animals

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