Carbon Cycle

What is the backbone of biomolecules?

What happens to the dissolved organic matter from marine organisms?

• It is used for photosynthesis

• It forms carbonate ions for shells and exoskeletons

• It is released as a gas

• It becomes part of the ocean floor

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NGSS.HS-LS2-6

What happens to carbon in the food chain?

• It moves up as primary consumers eat producers.

• It moves down as primary consumers are eaten by producers.

• It stays at the same level in the food chain.

• It is released as a gas during respiration.

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NGSS.HS-LS2-5

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What happens to the shells of organisms like crustaceans?

• They float on the ocean surface

• They sink to the ocean floor

• They become part of the atmosphere

• They are used for photosynthesis

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NGSS.MS-LS2-3

What is the largest sink for carbon in the carbon cycle?

• Rocks and sediments

• Plants

• Ocean

• Atmosphere

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NGSS.HS-ESS2-6

What is the effect of increasing hydrogen ions on the ocean?

• They increase the pH of seawater

• They help form shells and exoskeletons

• They release CO₂ into the atmosphere

• They lower the pH of seawater

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NGSS.HS-ESS3-5

What is the process by which carbon dioxide is converted to carbonate ions?

• Conversion to carbonic acid, then bicarbonate, then to carbonate ions

• Direct conversion to bicarbonate, then to carbonate ions

• Formation of carbonic acid and carbonate ions

• Direct formation of carbonate ions

What is the process by which carbon is sequestered in the ocean?

• Through photosynthesis by marine plants

• Through the formation of carbonate shells

• Both photosynthesis and formation of carbonate shells

• None of the above

Tags

NGSS.HS-LS2-5

After photosynthesis, what do producers do?

• They are eaten by consumers, then organisms die, and detritus sinks to the ocean floor forming fossil fuel deposits which are later burned to release carbon dioxide.

• They are eaten by consumers, then organisms die, and detritus is consumed, forming reservoirs of fossil fuels, which are later burned to release carbon dioxide.

• They break down their food by metabolism and release oxygen in the process.

• They are eaten by consumers, then organisms die, and carbon dioxide is absorbed during decomposition.

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NGSS.MS-LS2-3

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In the carbon cycle, what fundamental role do animals play?

• Decreasing the amount of dissolved carbon dioxide due to shell formation

• Increasing the amount of dissolved carbon dioxide as a result of respiration

• Increasing the amount of dissolved carbon dioxide as a result of photosynthesis

• Decreasing carbon levels as a result of photosynthesis

Tags

NGSS.HS-LS2-5

NGSS.HS-LS2-3