Carbon and Nitrogen Cycles

What can "Fix" nitrogen during nitrogen fixation

• plants and animals

• lightning and plants

• nitrogen-fixing bacteria & lightning

• animals and nitrogen-fixing bacteria

When nitrogen gas is turned in to a form that plants and animals can use is called 

• Combustion
• Photosynthesis
• Decomposition
• Nitrogen Fixation

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Photosynthesis is the process by which plants

• release CO₂ to the atmosphere.

• turn CO₂ into sugars.

• turn sugars into energy.

• none of the above

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Which of the following removes carbon from the atmosphere?

• Combustion

• Respiration

• Photosynthesis

• Death

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When oil, gas, wood, or coal is burned, the process is called _____.

• combustion

• decomposition

• the organic pathway

• the geologic pathway

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Which statement is true about the carbon dioxide-oxygen cycle?

• animals breathe in nitrogen and release oxygen which is used by plants
• animals breathe in oxygen and release carbon dioxide which is used by plants
• animals breathe in nitrogen and release carbon dioxide which is used by plants
• animals breathe in carbon dioxide and release oxygen which is used by plants

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Where can nitrogen fixing bacteria be found (2 right answers)

• Free living in the soil

• under the leaves of flowering plants

• in the atmosphere

• living on the nodules of certain plants

How do animals get the nitrogen they need? (2 right answers)

• From the air they breathe

• From the water they drink

• From the plants they eat

• From the meat they eat

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How do plants get the nitrogen they need?

• from the air
• from the soil or water in which they live
• from the Sun
• from broken-down rocks

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The process by which waste and dead organisms release nitrogen back into the soil to be used again.

• Decomposition
• Fixation
• Denitrification
• Sublimation

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