Nitrogen and Phosphorus Cycles

Organisms that need nitrogen to survive

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

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Plants and animals need nitrogen to make __________.

• Protein
• Carbohydrates
• Lipids
• Nucleic Acids

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How do  animals get nitrogen?

• the atmosphere 
• eating other organisms
• bacteria
• lightning 

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

• Combustion
• Photosynthesis
• Decomposition
• Nitrogen Fixation

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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Which nutrient is not cycled through the atmosphere because it is rarely found in gas form?

• carbon

• nitrogen

• phosphorous

• water

This is released by the weathering of rocks.

• Carbon
• Oxygen
• Phosphorus
• Nitrogen

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T/F: Since plants cannot directly absorb atmospheric nitrogen, they depend on bacteria to convert compounds into nitrates and ammonia.

• True

• False

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