WARM-UP: Nitrogen Cycle

What percentage of the atmosphere is made up of nitrogen?

• 5%

• 10%

• 78%

• 21%

What is a key component of DNA and all proteins?

• Hydrogen

• Carbon

• Oxygen

• Nitrogen

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How do humans and animals primarily get nitrogen?

• By breathing it in

• From water

• Through skin absorption

• From food

What process converts atmospheric nitrogen into a form usable by plants?

• Nitrogen fixation

• Respiration

• Transpiration

• Photosynthesis

What compound is created when bacteria combine nitrogen with hydrogen?

• Carbon dioxide

• Methane

• Ammonia

• Nitrous oxide

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What process turns ammonia into compounds that plants can absorb?

• Photosynthesis

• Ammonification

• Nitrification

• Denitrification

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What happens to nitrogen compounds in the soil after plants and animals die?

• They evaporate

• They form new plants

• They are broken down to ammonia

• They turn into fossil fuels

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What is the final step that returns nitrogen to the atmosphere in the nitrogen cycle?

• Photosynthesis

• Nitrification

• Ammonification

• Denitrification

How can human activity impact the nitrogen cycle?

• By planting more trees

• By walking on the soil

• By using fertilizers and producing waste

• By drinking water

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NGSS.MS-LS2-3