Article Reflection- The Nitrogen Cycle

Read the "Introduction."

What percent of the atmosphere is made up of nitrogen gas (N₂)?

Read "Bacteria play a key role in the nitrogen cycle."

What process removes nitrogen gas (N₂) from the atmosphere and converts it into other forms of nitrogen which can be used by living things?

• Eutrophication

• Nitrogen Fixation

• Denitrification

• Ammonification

Look at the diagram labeled "Prokaryotes in the nitrogen cycle."

Prokaryotes are bacteria. Match the following.

• Nitrifying Bacteria

• Ammonia to nitrites to nitrates.

• Denitrifying Bacteria

• Nitrogen gas to ammonia.

• Nitrogen Fixing Bacteria

• Nitrates to nitrogen gas.

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Read "Nitrogen cycling in marine ecosystems."

What type of rock is nitrogen stored in at the bottom of the oceans?

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Read "Nitrogen as a limiting nutrient."

What will happen to plants when given a limiting nutrient such as nitrogen?

• Plant growth will be unaffected.

• Plant growth will increase.

• Plant growth will decrease.

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Read "Nitrogen as a limiting nutrient."

Besides nitrogen, what is the other most common limiting nutrient in both natural ecosystems and agriculture?

Read "Human activity affects the cycling of nitrogen."

What is the name of the industrial process that people use to fix nitrogen?

Read "Human activity affects the cycling of nitrogen."

What product does most industrially-made nitrogen get used in?

• Fertilizer

• Fossil Fuels

• Cooking Oils

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Read "Human activity affects the cycling of nitrogen."

What is it called when runoff containing nutrients like nitrogen and phosphorus enter into bodies of water, causing algae blooms?

Read "Human activity affects the cycling of nitrogen."

TRUE OR FALSE: Eutrophication from excess nitrogen can create dead zones by causing oxygen depletion in the water.

• TRUE

• FALSE

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