Biology CLEP Prep Practice Exam

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Which type of photosynthesis produces oxygen as a by-product?

  1. C3

  2. C4

  3. CAM

  4. H3

The correct answer is: C3

C3 photosynthesis produces oxygen through a process known as photolysis. During this process, the energy from sunlight is used to split water molecules into oxygen and hydrogen ions, which are then used to produce energy through the Calvin cycle. Other types of photosynthesis, such as C4 and CAM, may produce oxygen but it is not their main function. H3 is not a type of photosynthesis and does not produce oxygen as a by-product.

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