Nitrogen Cycle

Both plants and animals use nitrogen to make _________ and __________

• nitrates and lightning

• proteins and DNA

• water and air

• gas and liquids

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What would happen to the animals in this aquarium if all the bacteria died?

• They would live longer because the bacteria couldn't harm them

• They would die because there would be excess ammonia in the tank.

• They would just move to another tank

• They would start eating their own poop to clean the tank

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Dead plants, animals, and animal waste are converted to ammonium by _____________________

• plant roots

• lightning

• bacteria and fungi decomposers

• denitrifying bacteria

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 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.

• True

• False

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According to this diagram, plants absorb

• nitrates

• nitrogen fixing bacteria

• animals

• decomposers

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What happens when organisms die and decay? 

• Their bodies are lifted up
• Their nitrogen returns to the soil
• they keep their nitrogen
• They stay on earth forever

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