Biogeochemical Cycles Quiz

What is the current percentage of carbon dioxide in our atmosphere?

• 0.04%

• 0.4%

• 4%

• 40%

During photosynthesis, what substance do plants use to produce glucose?

• Oxygen

• Nitrogen

• Carbon dioxide

• Water

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What happens to carbon when animals eat plants and algae?

• It is exhaled as carbon dioxide.

• It is stored in the animals as part of their body mass.

• It is converted into oxygen.

• It is released into the atmosphere as methane.

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What is the role of decomposers in the carbon cycle?

• They produce oxygen through photosynthesis.

• They consume carbon dioxide from the atmosphere.

• They release carbon dioxide back into the atmosphere during decomposition.

• They store carbon in the form of fossil fuels.

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How can carbon dioxide from the atmosphere end up in the ocean?

• By dissolving into seawater.

• Through photosynthesis by marine plants.

• By being absorbed by fish and other marine animals.

• Through evaporation of ocean water.

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What is one way that carbon can become fossilized?

• Through the process of photosynthesis.

• When living organisms die and are broken down by decomposers under certain conditions.

• When animals respire and release carbon dioxide.

• When plants absorb carbon dioxide from the atmosphere.

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What do humans do that releases carbon into the atmosphere?

• They extract and burn fossil fuels.

• They participate in the process of photosynthesis.

• They increase the absorption of carbon dioxide by oceans.

• They convert carbon dioxide into oxygen.

What do marine life such as molluscs and crustaceans use to build their shells?

• Calcium carbonate

• Carbon dioxide

• Glucose

• Nitrogen

What is the first step in the nitrogen cycle?

• Nitrification

• Nitrogen fixation

• Ammonification

• Denitrification

Which bacteria are involved in converting nitrogen into ammonium ions?

• Nitrosomonas

• Nitrobacter

• Free-living and symbiotic bacteria

• Denitrifying bacteria