Reviewing the Carbon & Nitrogen Cycles

How do living organisms return carbon to the atmosphere in the carbon cycle?

• respiration and photosynthesis
•  decomposition and respiration

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What is happening at 1?

• respiration: releasing CO2
• decomposing CO2 in the soil
• photosynthesis: absorbing CO2
• turning CO2 from the atmosphere into organic molecules

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Organisms that need nitrogen to survive

• only plants
• only animals
• only bacteria
• all living organisms

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Organisms that play a role in the nitrogen cycle

• only plants
• only animals
• only bacteria
• plants, animals, & bacteria

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Plants and animals need nitrogen to make __________.

• Protein
• Carbohydrates
• Lipids
• Nucleic Acids

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

• Combustion
• Photosynthesis
• Decomposition
• Nitrogen Fixation

How do  animals get nitrogen?

• the atmosphere 
• eating other organisms
• bacteria
• lightning 

What converts nitrogen into a useable form for plants and animals?

• bacteria
• fungi
• rain

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Identify the cycle pictured.

• The Water cycle
• The Carbon cycle
• The Nitrogen cycle
• The Phosphorus cycle

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Identify the cycle pictured.

• The Water cycle
• The Carbon cycle
• The Nitrogen cycle
• The Phosphorus cycle

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