Nitrogen Cycle

how is Nitrogen fixed naturally ?

• Volcanic activity

• Lighting

• Greenhouse gases

• bacteria

• Fungs

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Nitrogen fixing bacteria, lives in nodules on the root of a plant called

• Broccoli

• Legumes

• Beats

• Soybeans

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What is nitrogen fixation

• making nitrogen usable

• destroying nitrogen

• using nitrogen

• excreting nitrogen

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True or False...The nitrogen in the atmosphere is in a usable form and can be absorbed by living things.

• True

• False

What part of the water cycle does this picture show?

• condensation
• precipitation
• evaporation

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Nitrification...

• animals eat the plants and other animals that contain nitrogen and release it through their waste

• Bacteria in the soil and lightning in the atmosphere “fix” the nitrogen

• Once in the ground, bacteria in the soil also nitrify the nitrogen

• plants absorb nitrogen through their roots and return it back to the atmosphere

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How much of the atmosphere is composed of nitrogen gas?

• 87%
• 38%
• 78%
• 21%

The process of lightning changing atmospheric nitrogen into a more usable form is known as ____.

• ammonification

• assimilation

• lighting fixation

• denitrification

What is the most abundant gas in our atmosphere?

• oxygen

• carbon dioxide

• water vapor

• nitrogen

What is denitrification?

• Conversation of nitrite back to nitrogen gas

• Conversation of ammonia back to nitrogen gas

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