Nitrogen Cycle Review

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

• bacteria on the roots of plants

• rain

• fungi

• car exhaust

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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Organisms that need nitrogen to survive.

• only plants

• only animals

• only bacteria

• all living things

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How is nitrogen "fixed" into a usable form for plants?

• Through action of bacteria only

• Through lightning only

• Through action of bacteria and lightning

• Through photosynthesis

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How do 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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Gas that makes up 78% of our atmosphere.

• Oxygen

• Nitrogen

• Hydrogen

• Carbon Dioxide

Plants and animals cannot use nitrogen directly from the air. It has to be converted first.

• True

• False

What do free living bacteria in the soil do?

• Make clouds

• Turn atmospheric nitrogen into nitrates

• Make carbon dioxide for plants to go through photosynthesis

• Help plants take in water

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In the nitrogen cycle, what does label A in the diagram represent?

• Gas

• Clouds

• Carbon dioxide in the atmosphere

• Nitrogen in the atmosphere

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The process by which waste and dead organisms release nitrogen back into the soil to be used again.

• Decomposition
• Fixation
• Denitrification
• Sublimation

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