Which of the following is a waste product of photosynthesis? 

  1. Molecular Oxygen
  2. Glucose
  3. Water
  4. Carbon

The waste product of photosynthesis is 1. molecular oxygen.

While all the other options play a role in photosynthesis:

  • Glucose is the main product of photosynthesis, used by plants for energy and growth.
  • Water is used as a reactant in photosynthesis, split to provide electrons and hydrogen ions.
  • Carbon is absorbed as carbon dioxide (CO2) and incorporated into glucose molecules.

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