Nitrogen Cycle Quiz

Plants and animals need nitrogen to make __________.

• Protein
• Carbohydrates
• Lipids
• Minerals

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

• bacteria
• fungi
• rain
• car exhaust 

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What is an example of a legume?

• strawberries
• carrots
• peanuts
• corn

How nitrogen is "fixed" into  a useable form for plants...

• through action of bacteria only
• through lightning only
• through action of bacteria & lightning
• through photosynthesis

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The process where excess nutrients enter a body of water causing overgrowth of aquatic plants and algae...

• Eutrophication
• Acid Precipitation
• Nitrogen Fixation
• Decomposition

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Organisms that convert fixed nitrogen back into nitrogen gas and release nitrogen gas back into atmosphere...

•  denitrifying bacteria
• fungi
• maggots 
• all of the above

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The process in which Nitrogen circulates and is recycled is called ____________

• The nitrogen cycle
• The water cycle
• The carbon cycle
• The phosphorus cycle

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Organisms that need nitrogen to survive

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

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Bacteria fix nitrogen on plant roots. Plant roots provide sugar to bacteria. This is an example of

• mutualism
• parasitism
• commensalism
• competition

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Because nitrogen is required for growth, it is considered an essential...

• nitrate
• nutrient
• organism
• cell

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