Molecule by which oxygen atoms discharged by photosynthesis

Question

Photosynthesis is the most significant producer of molecular oxygen (O₂) on our earth. Name the molecule from which oxygen atoms discharged by photosynthesis come? From which other molecule could one suspect they have come? Write the destinations of those oxygen atoms?

Answer 1

The oxygen atoms liberated as molecular oxygen by the photosynthesis method come from water. One indeed could suspect that such oxygen atoms would come from carbon-dioxide. Oxygen atoms from carbon-dioxide though are incorporated into glucose molecules and into water molecules released in the chemical phase of photosynthesis.