Nitrogen Cycle

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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What process occurs when dead plant and animal matter decomposes and nitrogen is released back into the atmosphere?

• Assimilation

• Fixation

• Ammonification

• Denitrification

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Bacteria fix nitrogen from the atmosphere into a form plants can use.

• True

• False

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Plants and animals need nitrogen to make __________.

• Protein
• Carbohydrates
• Lipids
• Minerals

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After plants and animals contain nitrogen, what puts it back into atmosphere and soil?

• decomposition
• precipitation
• condensation
• bacteria

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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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What is the process of combining nitrogen gas with other elements to make nitrogen into usable compounds?

• nitrogen composition
• ammonia 
• nitrogen fixation
• denitrification

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Organisms require nitrogen to make which of the following?

• glucose and starch
• lipids and nucleic acids
• proteins and nucleic acids
• carbohydrates and proteins

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