Carbon and Nitrogen Cycle Review

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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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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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 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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Which is a process that does NOT introduce carbon into the atmosphere?

• cellular respiration

• burning fossil fuels

• decomposition

• photosynthesis

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Ammonia is converted to nitrates by ___________________bacteria and then the plant absorbs the nitrates

• rhizobium

• denitrifying

• nitrifying

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bacteria turns nitrates back into atmospheric nitrogen

• rhizobium

• nitrifying

• denitrifying

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

• bacteria

• rain

• fungi

• car exhaust

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Carbon is stored in

• trees and other living things

• oceans

• underground in soil and fossil fuels

• all are correct

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