Biogeochemical Cycles Quiz

Which statement best explains why carbon is considered the basis of life?

• Carbon is found only in the atmosphere

• Carbon forms large molecules used by living organisms

• Carbon cycles faster than all other elements

• Carbon is only found in fossil fuels

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In the carbon cycle, which process removes carbon dioxide from the atmosphere?

• Cellular respiration

• Combustion

• Photosynthesis

• Decomposition

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Which process releases carbon dioxide into the atmosphere as a waste product?

• Photosynthesis

• Cellular respiration

• Nitrogen fixation

• Weathering

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Why can plants NOT use nitrogen directly from the atmosphere?

• Nitrogen gas is toxic to plants

• Nitrogen gas is too heavy to enter leaves

• Nitrogen gas must first be changed into a usable form

• Plants do not need nitrogen

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Which living organisms are most important for changing nitrogen into different usable forms?

• Plants

• Animals

• Fungi

• Bacteria

Which nitrogen process changes nitrogen gas into a form plants can use?

• Denitrification

• Nitrification

• Nitrogen fixation

• Decomposition

Excess nitrogen or phosphorus entering water systems can cause:

• Acid rain

• Climate change

• Eutrophication

• Fossilization

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Which statement correctly compares the cycles?

• All three cycles move through the atmosphere

• Only carbon and nitrogen move through the atmosphere

• Only phosphorus moves through the atmosphere

• All three cycles depend equally on bacteria

Plants take in carbon dioxide during the process of​ ​ (a)   .

• decomposition
• plants
• carbon dioxide (CO2)
• atmosphere
• photosynthesis

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The process where organisms like bacteria and fungi break down dead organisms and return nutrients to the soil is called (a)   .

• photosynthesis

• decomposition
• plants

• carbon dioxide (CO2)

• atmosphere

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