Biogeochemical Cycles Lesson

Carbon dioxide is added to the atmosphere by

• Burning fossil fuels 

• Cellular respiration

• Decomposing organic matter

• All answers are correct

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NGSS.MS-ESS3-4

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The main way nitrogen is removed from the atmosphere and changed into a form plants can use is

• Nitrogen Fixation

• Nitrification

• Ammonification

• Denitrification

Nitrification is the process by which bacteria

• Make ammonium

  NH₄⁺

• Create Nitrate

  NO₃^-

• Create Nitrite

  NO₂^-

• Return nitrogen gas to the air

  N₂

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Biogeochemical Cycles are important because

• matter in an ecosystem is finite and must be recycled

• living things need Nitrogen, Carbon, and Phosphorus to make the building blocks of cells

• they aren't important and it is a waste of time learning about them

• If matter didn't cycle, organisms would eventually run out of materials to build new cells

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NGSS.MS-LS1-6

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Which of the following are true of biogeochemical cycles?

• They ensure that nutrients are used only once by organisms.

• The create new materials to replace lost ones.

• They increase the total amount of matter over time.

• They can be affected by human activity.

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NGSS.MS-ESS3-4

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Which of the following is an example of how biogeochemical cycles are important in sustaining life?

• The atoms of water molecules are destroyed during a drought.

• Oxygen atoms are converted into carbon during cellular respiration.

• Nitrogen in wastes are converted into useable nutrients for other organisms.

• New carbon atoms are created during the carbon cycle.

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NGSS.MS-LS2-3

Decomposition is found during which of the following cycles? Choose all the apply.

• Phosphorus

  Cycle

• Carbon

  Cycle

• Nitrogen

  Cycle

• Water Cycle

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The Phosphorus cycle is important because phosphorus is contained in

• sugars

• DNA

• proteins

• starches

Carbon Dioxide (CO₂) is released in which of the following processes?

• photosynthesis

• decomposition

• combustion

• cellular respiration

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In the carbon cycle, the only process that removes CO2 from the atmosphere is

• combustion

• cellular respiration

• decomposition

• photosynthesis

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