Carbon and Nitrogen Cycle

Which of the following add carbon dioxide to the atmosphere?

• volcanoes
• combustion of fossil fuels
• animal and plant respiration
• all of these

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How nitrogen is "fixed" into useable form for plants

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

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Why do all organisms need nitrogen?

• To live and grow 
• To build phosphorus
• To make oxygen levels grow
• To help blood circulate better

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Nitrogen fixing bacteria, lives in nodules on the root of a plant called

• Broccoli
• Legumes
• Beats
• Carrots

Where does Photosynthesis get the carbon dioxide it needs?

• from photosynthesis

• from the water cycle

• from cellular respiration

• from the nitrogen cycle

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Which gas dissolves in the ocean and is used in Photosynthesis for aquatic plants?

• water vapor

• nitrogen gas

• carbon dioxide

• glucose

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Where does nitrogen go once it is in the soil?

• stems of plants

• leaves of plants

• roots of plants

• flowers of plants

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What lives in the roots of plants that fix the nitrogen so that plants can use the nitrogen?

• bacteria

• viruses

• malaria

• protists

Animals get nitrogen by ____________.

• breathing air

• eating plants

• dying

• being struck by lightning

Algal blooms usually occur when nitrogen increases in the

• air.

• water.

• soil.

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