Photosynthetic organisms always produce oxygen gas as a metabolic byproduct.

Name: Photosynthetic organisms always produce oxygen gas as a metabolic byproduct.
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Not all photosynthetic organisms produce oxygen as a byproduct. Oxygenic photosynthesis, found in plants, algae, and cyanobacteria, splits water molecules to produce oxygen. However, some bacteria perform anoxygenic photosynthesis, where they use substances other than water (like hydrogen sulfide) and do not produce oxygen.

Photosynthetic Organisms Always Produce Oxygen Gas as a Metabolic Byproduct