Nitrogen Cycle

Identify the processes in the nitrogen cycle.

a

b

c

d

e

f

Ingestion

Nitrification

Nitrogen Fixation

Denitrification

Assimilation

Ammonification

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Nitrogen Cycle

How much of the atmosphere is composed of nitrogen gas?

• 87%
• 38%
• 78%
• 21%

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Nitrogen Cycle

If the atmosphere is 78% N₂, why can't we just get our nitrogen by breathing?

• We have no mechanism to break the triple bond of nitrogen between the atoms.
• Our lungs would be damaged by the N2.
• We need Oxygen for cellular respiration.
• The legumes take it up first.

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Nitrogen Cycle

Match the following steps of the nitrogen cycle to how they move bacteria.

• Ammonification

• Atmosphere to Geosphere

• Assimilation

• Geosphere to Atmosphere

• Nitrogen Fixation

• Biosphere to Geosphere

• Denitrification

• Geosphere to Biosphere

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Nitrogen Cycle

Match the following steps of the nitrogen cycle to how they move bacteria.

• Biosphere to Geosphere

• Denitrification

  (Soil to the air)

• Geosphere to Biosphere

• Ammonification

  (Decaying organisms to the soil)

• Geosphere to Atmosphere

• Assimilation

  (Soil to plants)

• Atmosphere to Geosphere

• Nitrogen Fixation

  (Atmospheric nitrogen to ammonia in the soil)

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Nitrogen Cycle

Plants and animals cannot use nitrogen directly from the air.

• True

• False

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Nitrogen Cycle

What converts nitrogen gas into a usable form for plants and animals?

• bacteria

• rain

• fungi

• car exhaust

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Nitrogen Cycle

According to this diagram, plants use nitrogen to make _________________________

• bacteria

• animals

• proteins

• decomposers

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Nitrogen Cycle