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SAT Biology Subject Test Practice Questions

Category - Biology

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Which of the following is a byproduct of photosynthesis?

Water
Carbon monoxide
Oxygen
Nitrogen
Carbon monoxide

Explanation

Answer: C, Oxygen. Oxygen is released as a byproduct of photosynthesis in plants.

Key Takeaway: Photosynthesis is a process that converts carbon dioxide and water into organic compounds such as sugars using sunlight as energy. Oxygen is released as a byproduct of this process, in the same way that carbon dioxide is released by humans as a byproduct of aerobic respiration. Nitrogen and carbon monoxide are not involved in either process.

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