Question 1

Which of the following best describes the role of photosynthesis in the global carbon cycle?

Accepted Answer

Photosynthesis removes CO$$_2$$ from the atmosphere and incorporates it into organic molecules.

Question 2

Which equation correctly represents the process of cellular respiration as it relates to the carbon cycle?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\ \mathrm{O}_2 \rightarrow 6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2\mathrm{O}$$

Question 3

What is the primary way that carbon returns from living organisms to the atmosphere?

Accepted Answer

Through cellular respiration and decomposition.

Question 4

Which of the following human activities has most significantly increased atmospheric CO$$_2$$ levels?

Accepted Answer

Burning fossil fuels such as coal and oil.

Question 5

Why is the balance between photosynthesis and respiration important for atmospheric CO$$_2$$ levels?

Accepted Answer

It maintains a relatively stable concentration of CO$$_2 in $$the atmosphere.

Question 6

Which of the following best explains the role of decomposers in the carbon cycle?

Accepted Answer

They release carbon from dead organic matter back into the atmosphere as CO$$_2.$$

Question 7

A forest ecosystem is experiencing increased rates of respiration due to higher temperatures. What is the most likely effect on atmospheric CO$$_2$$ levels?

Accepted Answer

Atmospheric CO$$_2$$ levels will increase because more CO$$_2 is $$being released.

Question 8

Which of the following is a direct consequence of burning fossil fuels on the carbon cycle?

Accepted Answer

Increased atmospheric CO$$_2$$ due to the release of stored carbon.

Question 9

Which process is responsible for converting inorganic carbon (CO$$_2) $$into organic molecules in living organisms?

Accepted Answer

Photosynthesis

Question 10

If the rate of photosynthesis in a global ecosystem suddenly decreased, what would be the most likely long-term effect on atmospheric CO$$_2$$ levels?

Accepted Answer

Atmospheric CO$$_2$$ levels would increase.

Question 11

Which of the following best describes the relationship between producers and consumers in the carbon cycle?

Accepted Answer

Producers fix CO$$_2$$ into organic molecules, and consumers release CO$$_2$$ through respiration.

Question 12

Which of the following equations represents the process of photosynthesis?

Accepted Answer

$$6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\ \mathrm{O}_2$$

Question 13

A scientist measures the amount of CO$$_2 in a $$sealed terrarium over several days. During the day, CO$$_2$$ levels decrease, but at night, they increase. Which processes are responsible for these changes?

Accepted Answer

Photosynthesis during the day and respiration at night.

Question 14

Which of the following statements about the carbon cycle is correct?

Accepted Answer

Carbon cycles globally and locally through both biotic and abiotic reservoirs.

Question 15

Which of the following would most likely disrupt the balance between photosynthesis and respiration in an ecosystem?

Accepted Answer

A large-scale deforestation event.

Question 16

Which of the following is a major abiotic reservoir for carbon in the carbon cycle?

Accepted Answer

Atmosphere

Question 17

A farmer notices that the soil in his field is becoming less fertile over time. Which process in the carbon cycle could help restore soil fertility?

Accepted Answer

Enhancing decomposition of organic matter by soil microbes.

Question 18

Which of the following best explains why burning fossil fuels affects the carbon cycle?

Accepted Answer

It releases carbon that was previously stored underground into the atmosphere as CO$$_2.$$

Question 19

Which of the following scenarios would most likely result in a net increase in atmospheric CO$$_2$$?

Accepted Answer

A large-scale burning of fossil fuels.

The Carbon Cycle: Links Between Photosynthesis and Respiration

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