Carbon and Nitrogen Cycle Review

In the carbon cycle, this type of organism breaks down organic (living) matter into nutrients in the soil, which can be used by plants.

• Producers

• Consumers

• Decomposers

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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.

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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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The nitrogen cycle has many key processes, including nitrogen fixation, nitrification, assimilation, ammonification, and denitrification. Which type of organism is involved in almost all of these processes?

• Plants

• Animals

• Bacteria and decomposers

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Why is decomposition 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 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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pH levels in a pond

• abiotic

• biotic

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bacterial parasites

• Abiotic

• Biotic

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