Which one of the following is <strong>NOT</strong> a requirement for photosynthesis?

  1. A. Chlorophyll
  2. B. CO_{2}
  3. C. Water
  4. D. O_{2}

Correct Answer: D. O_{2}

Explanation

Oxygen (O_{2}) is a byproduct of photosynthesis, not a raw material or requirement for the process.

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