Carbon and Nitrogen in the Ecosystem

Why is combustion an important process in the carbon cycle?

• It turns fossil fuels into carbon dioxide.

• It turns once living things and organic matter into fossil fuels.

• It turns carbon dioxide into glucose, so animals can eat the carbon.

• It turns glucose into carbon dioxide, which gets released into the air.

What is true about nutrients in the ecosystem (such as water, carbon, and nitrogen)?

• They are not affected by humans in the ecosystem.

• They cannot be recovered if they are lost in the ecosystem.

• They cycle through the ecosystem in different forms to support life.

• They are usually only found in one form in the ecosystem to support life.

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Why is respiration an important process in the carbon cycle?

• It turns fossil fuels into carbon dioxide.

• It turns once living things and organic matter into fossil fuels.

• It turns carbon dioxide into glucose, so animals can eat the carbon.

• It turns glucose into carbon dioxide, which gets released into the air.

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Why is photosynthesis an important process in the carbon cycle?

• It turns fossil fuels into carbon dioxide.

• It turns once living things and organic matter into fossil fuels.

• It turns carbon dioxide into glucose, so animals can eat the carbon.

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How does a lion obtain the carbon it needs from a grass plant?

• The lion breathes in carbon given off by the grass.

• The lion cannot obtain the carbon in a grass plant.

• The lion absorbs the carbon given off by transpiration.

• The lion eats the antelope that ate the grass.

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Within the carbon cycle, anything that absorbs more carbon from the atmosphere than it releases.

• carbon sink

• carbon source

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Within the carbon cycle, anything that releases more carbon into the atmosphere than it absorbs.

• carbon sink

• carbon source

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Carbon can be released into the atmosphere by...

• Cell respiration in plants and animals on land

• Combustion of fossil fuels

• Cell respiration in plants and animals in the ocean

• Photosynthesis

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

• bacteria

• rain

• fungi

• car exhaust

According to this diagram, plants use nitrogen to make _________________________

• carbohydrates

• cellulose

• proteins

• unsaturated fats

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