Carbon Cycle Quiz

The diagram shows a model that Peter made of the carbon cycle. Which mistake did Peter make in the model?

• Plants do not lose carbon through respiration.

• The burning of fossil fuel does not release carbon.

• Organisms that decay do not deposit carbon in the soil.

• Animals do not breathe carbon dioxide from the atmosphere.

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Carbon is essential for life. Every part of the food chain plays a part in the cycle that transfers carbon between living organisms and the environment. Which organisms take in carbon from the environment to make it available for living organisms?

• primary consumers

• decomposers

• producers

• secondary consumers

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Producers, consumers, and decomposers work together to conserve the carbon on Earth. Which statement is the correct model of the carbon cycle?

• Producers use carbon to make food, consumers take in carbon from the organisms they eat, and decomposers break down remains and release carbon.

• Producers produce carbon from the sun, consumers consume carbon from the organisms they eat, and decomposers break down remains and release carbon.

• Producers make organisms that produce carbon, consumers eat and release the carbon from their food, and decomposers make carbon from the producers.

• Producers take the carbon from carbon dioxide in the air, while consumers and decomposers use carbon to produce carbon-containing molecules like sugars.

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NGSS.MS-LS2-3

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Photosynthesis and cellular respiration demonstrate the conservation of mass and energy. What do chloroplasts produce that mitochondria use to make chemical energy?

• oxygen and carbon dioxide

• carbon dioxide and glucose

• oxygen and glucose

• water and oxygen

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What happens to light energy from the Sun when it reaches the surface of Earth?

• The light energy is multiplied when it reaches the plants on Earth.

• The light energy is destroyed when plants are eaten by herbivores.

• The light energy is transformed to chemical energy by photosynthesis.

• The light energy is converted to potential energy by cellular respiration.

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How does carbon dioxide enter the atmosphere?

• Carbon dioxide is only released into the atmosphere by human activities.

• Carbon dioxide is only released into the atmosphere by animals and bacterial decomposers.

• Carbon dioxide is only released into the atmosphere by plants, animals, and bacterial decomposers.

• Carbon dioxide is released into the atmosphere by plants, animals, bacterial decomposers, and human activities.

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A student is drawing a model of the carbon cycle. Which caption should he include to explain how herbivores contribute to the carbon cycle from the food they eat?

• Herbivores eat plants, producing carbon dioxide during cellular respiration that is released into the atmosphere.

• Herbivores eat plants, producing carbon dioxide during photosynthesis that is released into the atmosphere.

• Herbivores use carbon dioxide from the atmosphere to produce oxygen during cellular respiration.

• Herbivores use oxygen from the atmosphere to produce carbon dioxide during photosynthesis.

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Which statement about the carbon cycle is most true?

• Energy is destroyed when organic matter decays.

• The total mass of carbon on Earth is always increasing.

• Carbon is lost from the cycle when it enters the atmosphere.

• Carbon changes form, but the total amount on Earth remains the same.

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Which of the following statements is most accurate?

• A specific and limited amount of carbon exists on Earth, and it moves through living and nonliving materials through the carbon cycle.

• The amount of carbon in the universe cycles, gradually increasing as it moves up the food chain, and decreasing until the next phase of the cycle.

• Carbon flows through the food chain as animals eat it, then decomposes and is permanently removed from the system when the food chain is complete.

• Carbon enters Earth's atmosphere when animals exhale, then moves into space where its amount steadily increases, and finally moves back into Earth's atmosphere to be used again.

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During photosynthesis, plants absorb carbon dioxide and water, and produce oxygen and glucose. Which statement best describes how this process follows the law of conservation of mass?

• The volume of water used by this process is equal to the volume of water released from plant leaves at night.

• The amount of carbon dioxide gas absorbed by one plant is equal to the amount of oxygen and glucose it produces.

• The cells in the plant absorb the same amount of energy from the Sun that humans need when burning sugars during digestion.

• The number of oxygen atoms in the carbon dioxide and water used by this process equals the total number of oxygen atoms produced by the plant.

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