Question

In which of the following, oxygen does not evolve during photosynthesis?

• A. Photosynthetic red algae
• B. Photosynthetic greem algae
• C. Photosynthetic blue-green algae
• D. Photosynthetic bacteria

Answer 1

The correct option is D Photosynthetic bacteria

Like green plants and algae, some purple and green sulphur bacteria are capable of synthesising their organic food in presence of light, which is known as bacterial photosynthesis. This process is anoxygenic, that is they do not produce or evolve $O_2$. This is because the photosynthetic bacteria use hydrogen sulphide, hydrogen or some other substance as the proton donor instead of water as is used by plants.