Geochemical Cycles

Carbon dioxide (CO₂) is returned to the atmosphere primarily by

• Consumption

• Combustion and cellular respiration

• Waste elimination

• Photosynthesis

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Why are the water, carbon, nitrogen, and phosphorus cycles important within our biosphere?

• They have no significant impact on the environment

• They help regulate the Earth's climate and support life

• They only affect aquatic ecosystems

• They are only relevant to the study of geology

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According to this diagram, plants absorb

• nitrates

• nitrogen fixing bacteria

• animals

• decomposers

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What is the significance of nitrogen fixation in the nitrogen cycle?

• It has no significance in the nitrogen cycle

• It converts nitrogen gas into a form that plants can use

• It only affects aquatic ecosystems

• It only affects the atmosphere

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What is the role of decomposition in the carbon cycle?

• It has no role in the carbon cycle

• It releases carbon dioxide into the atmosphere

• It converts dead organic material into carbon dioxide

• It only affects soil quality

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Label the Carbon Cycle

a

b

c

d

e

f

food chain

Plant Respiration

Photosynthesis

Dead Organisms

Burning Fossil Fuels

Animal Respiration

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

• bacteria

• rain

• fungi

• car exhaust

This is NOT a part of the phosphorus cycle.

• Phosphate is incorporated into sedimentary rocks

• Phosphate bound to soil

• Atmospheric phosphate

• Phosphate is absorbed from the soil by plants

Which of the following processes is a key component of the carbon cycle?

• Photosynthesis

• Evaporation

• Condensation

• Precipitation

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What role do plants play in the carbon cycle?

• They release carbon dioxide during photosynthesis

• They absorb carbon dioxide during photosynthesis

• They convert carbon dioxide into nitrogen

• They have no role in the carbon cycle

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NGSS.MS-LS1-6

NGSS.MS-LS2-3