Nitrogen Cycle

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

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

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Which plant is an example of a legume?

• strawberries

• carrots

• peanuts

• corn

What is the process of combining nitrogen gas with other elements to make nitrogen into usable compounds?

• nitrogen composition
• ammonia 
• nitrogen fixation
• denitrification

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Organisms require nitrogen to make which of the following?

• glucose and starch
• lipids and nucleic acids
• proteins and nucleic acids
• carbohydrates and proteins

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Process where excess nutrients enter body of water causing overgrowth of aquatic plants and algae...

• Eutrophication
• Acid Precipitation
• Nitrogen Fixation
• Decomposition

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How much of the atmosphere is composed of nitrogen gas?

• 87%
• 38%
• 78%
• 21%

What can excess amounts of nitrogen cause in ecosystems? 

• Disrupts the equilibrium of ecosystem, causing number of species to decline

• Leads to improvement of an ecosystem due to healthy plant growth

• Leads to high oxygen content in aquatic ecosystems

• Increases the speed of decomposition of plants and animals 

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

• mutualism

• parasitism

• commensalism

• competition

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Organisms that break down dead plants & animals and release nitrogen back into atmosphere...

• bacteria
• plants
• animals
• producers

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Plants absorb ______ to produce proteins and nucleic acids.

• nitrates

• nitrogen fixing bacteria

• animals

• decomposers

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