Carbon Cycle Quiz

Describe the journey that a carbon atom inside a volcano will take to become a carbon atom inside a plant.

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What do you think might happen to the carbon cycle if humans were to continue to combust vast areas of forests to make room for more factories?

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What is the main source of carbon for plants during photosynthesis?

• carbon dioxide in the atmosphere

• carbon dioxide dissolved in water

• carbon in the soil

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What happens to carbon during cellular respiration?

• It is converted into organic matter.

• It is released back into the atmosphere as carbon dioxide.

• It is absorbed by plants for respiration.

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How do oceans contribute to the carbon cycle?

• by releasing carbon dioxide into the atmosphere

• by absorbing carbon dioxide from the atmosphere

• by converting carbon dioxide into organic matter

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How do sedimentary rocks contribute to the carbon cycle?

• by absorbing carbon dioxide from the atmosphere

• by storing carbon over long periods of time

• by converting carbon into organic matter

What happens when fossil fuels are burned for energy?

• Carbon stored in them is released as carbon dioxide.

• Carbon is converted into sedimentary rocks.

• Carbon is absorbed by the oceans.

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How have human activities impacted the carbon cycle?

• by decreasing the levels of carbon dioxide in the atmosphere

• by increasing the levels of carbon dioxide in the atmosphere through the burning of fossil fuels

• by trapping carbon dioxide in sedimentary rocks

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What natural process contributes to the sudden release of large amounts of carbon dioxide into the atmosphere?

• photosynthesis

• volcanic activity

• oceanic uptake

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What is the main process by which carbon is returned to the soil as nutrients?

• photosynthesis

• decomposition

• sedimentation

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