Carbon Cycle - year - 8

What is the primary way carbon enters the atmosphere?

• From respiration and combustion

• Through photosynthesis

• By decomposers breaking down dead organisms

• Absorption by producers

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What do producers do with carbon dioxide in the carbon cycle?

• Use it to make glucose in photosynthesis

• Convert it into methane

• Store it as fossil fuels

• Release it into the atmosphere

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How is most of the carbon that animals consume returned to the atmosphere?

• Through the process of photosynthesis

• By decomposers after the animals die

• Exhaled as carbon dioxide during respiration

• Absorbed by the soil

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What happens to carbon in dead organisms when decomposition is blocked?

• It is absorbed by living plants

• It may become fossil fuel in the future

• It remains in the soil indefinitely

• It is released into the atmosphere as methane

What is the role of decomposers in the carbon cycle?

• They convert carbon dioxide into oxygen

• They feed on living organisms

• They produce carbon dioxide through photosynthesis

• They break down dead organisms, returning carbon to the atmosphere

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Which process converts glucose back into carbon dioxide?

• Decomposition

• Respiration

• Combustion

• Photosynthesis

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What is the end product of combustion in the carbon cycle?

• Carbon dioxide

• Oxygen

• Glucose

• Water vapor

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How do animals contribute to the carbon cycle?

• By converting glucose into fuel

• By passing carbon compounds along the food chain

• Through the process of photosynthesis

• By absorbing carbon dioxide directly from the atmosphere

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What is the significance of fossil fuels in the carbon cycle?

• They are a primary source of oxygen

• They are created by the rapid decomposition of organic material

• They store carbon that can be released through combustion

• They absorb carbon dioxide from the atmosphere

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Which of the following is not a process in the carbon cycle?

• Transpiration

• Combustion

• Respiration

• Photosynthesis

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