The Global Carbon Cycle

What is the primary role of carbon dioxide (CO2) in Earth's atmosphere?

• It provides oxygen for breathing.

• It is used by plants to produce nitrogen.

• It is the main component of ocean water.

• It acts as a principal greenhouse gas that traps heat.

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Which process converts inorganic CO2 into organic carbon compounds?

• Evaporation

• Photosynthesis

• Cellular respiration

• Combustion

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How does cellular respiration complement photosynthesis?

• By oxidizing organic carbon back to CO2 and releasing energy

• By producing oxygen and glucose

• By absorbing sunlight and converting it into energy

• By storing carbon in fossil fuels

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What happens to CO2 when it is absorbed by the oceans?

• It is released back into the atmosphere immediately.

• It reacts with water to form carbonic acid and bicarbonates.

• It turns into oxygen and hydrogen.

• It forms fossil fuels.

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What percentage of Earth's total carbon is stored in fossil fuels?

• 25%

• 0.006%

• 10%

• 50%

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Approximately how many gigatons of CO2 do humans emit annually?

• 5 gigatons

• 50 gigatons

• 10 gigatons

• 30 gigatons

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What is the main consequence of the surplus CO2 in the atmosphere?

• It intensifies the greenhouse effect, leading to global warming.

• It increases the amount of oxygen in the atmosphere.

• It causes the oceans to freeze.

• It decreases the Earth's temperature.

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Why is understanding CO2's chemistry important?

• To recognize its environmental impact and develop mitigation strategies.

• To increase the production of fossil fuels.

• To decrease the amount of oxygen in the atmosphere.

• To enhance the greenhouse effect.

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What role do oceans play in carbon sequestration?

• They absorb CO2 and contribute to marine life’s skeletal structures.

• They release CO2 into the atmosphere.

• They increase the Earth's temperature.

• They convert CO2 into fossil fuels.

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What is the significance of oxidation-reduction reactions in the carbon cycle?

• They help demystify the chemistry behind life and climate.

• They increase the amount of fossil fuels.

• They decrease the Earth's temperature.

• They convert oxygen into nitrogen.

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