Nitrogen Cycle Worksheet

Which process in the nitrogen cycle converts atmospheric nitrogen (N₂) into a form usable by plants?

• Nitrogen fixation

• Denitrification

• Decomposition

• Assimilation

What is the role of nitrifying bacteria in the nitrogen cycle?

• Convert ammonium (NH₄⁺) to nitrates (NO₃⁻)

• Convert nitrates (NO₃⁻) to nitrogen gas (N₂)

• Fix nitrogen from the atmosphere

• Decompose organic matter

Tags

NGSS.MS-LS2-3

Which organisms are responsible for returning nitrogen to the atmosphere in the nitrogen cycle?

• Denitrifying bacteria

• Nitrifying bacteria

• Plants

• Detritivores

Explain how nitrogen from dead plants and animals is returned to the soil in the nitrogen cycle.

• Through decomposition by detritivores and bacteria

• Through nitrogen fixation by plants

• Through assimilation by plants

• Through denitrification by bacteria

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NGSS.MS-LS2-3

A farmer wants to increase the nitrogen content in the soil for better crop growth. Which process or organism should the farmer encourage in the soil?

• Nitrogen-fixing bacteria

• Denitrifying bacteria

• Detritivores

• Herbivores

Tags

NGSS.MS-LS2-3

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What is the symbol for Nitrogen on the Periodic Table?

• N

• Ni

• Ne

• Ng

What percentage of air is made up of Nitrogen gas?

• 21%

• 50%

• 78%

• 10%

Why is Nitrogen considered a necessary building block in living things?

• It is used for breathing only

• It is a key component in the structure and function of living organisms

• It is only found in rocks

• It is not important for living things

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What does the term "Free Nitrogen" refer to?

• Nitrogen combined with oxygen

• Nitrogen combined with hydrogen

• Nitrogen not combined with any other element

• Nitrogen in water

Which process in the Nitrogen Cycle converts atmospheric nitrogen (N₂) into a form usable by plants?

• Denitrification

• Nitrogen fixation

• Assimilation

• Nitrification

Tags

NGSS.MS-LS2-3