Carbon Cycle

When humans burn fossil fuels, most of the carbon quickly enters the                       as carbon dioxide.

• Water
• Atmosphere
• Sun
• Air

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Which one of these does not add CO2 to the atmosphere?

• cooking with gas
• planting trees
• burning wood
• riding in a bus

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What does not produce carbon dioxide?

• Photosynthesis
• Burning Fossil Fuels
• Animal respiration
• Plants decaying

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

• respiration and photosynthesis
•  decomposition and respiration

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In the carbon cycle, producers take in the gas __

• carbon dioxide
• oxygen
• nitrogen
• carbon monoxide

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How does the carbon in grass become part of a lion?

• The lion eats the grass
• Carbon from grass doesn't end up in a lion. 
• The carbon ends up in the lion's food chain. 
• The lion breathes in carbon given out by the plant

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All of the carbon in existence is continually recycled in the carbon cycle

• True
• False

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Which of the following removes carbon from the atmosphere?

• Combustion
• Respiration
• Photosynthesis
• Death

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Organisms that do not decompose can be buried and become what?

• water
• nutrients
• air
• fossil fuels

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If the plant population decreased, the amount of carbon would _________.

• Stay the same
• Increase
• Decrease

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