AICE Environmental Management Paper 2 Practice Exam

Which process in the carbon cycle returns carbon dioxide to the atmosphere?

Photosynthesis Erosion Respiration Absorption by oceans

Correct Answer:

Respiration

Explanation:

Respiration releases carbon dioxide back into the atmosphere. During cellular respiration, organisms break down glucose with oxygen to release energy, and carbon dioxide is produced as a waste product. This returns CO2 to the air and helps balance the amount taken up during photosynthesis, which uses CO2 to build sugars. Absorption by oceans removes CO2 from the atmosphere, so it doesn’t return it. Erosion affects rocks and carbon storage in the long term, but it isn’t a direct, immediate source of CO2 to the atmosphere.

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