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AP Biology Practice Questions

Category - Biology

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In the carbon cycle, carbon dioxide is returned to the atmosphere immediately following:

I. Photosynthesis
II. Death
III. Respiration
  1. I only
  2. II only
  3. III only
  4. I and II only
  5. II and III only
Explanation
Answer: E, II and III only. Photosynthesis uses carbon dioxide, not releases it.

Key Takeaway: In the carbon cycle, carbon dioxide is released into the atmosphere after two occasions. First, respiration in plants and animals released carbon dioxide directly into the atmosphere. Also, the decay of organisms after death also releases carbon dioxide into the atmosphere.
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