Question

Which one of the following categories of organisms does not evolve oxygen during photosynthesis?

• A. Photosynthetic bacteria
• B. Blue green algae
• C. $C_4$ plants with Kranz anatomy
• D. Red algae

Answer 1

The correct option is A Photosynthetic bacteria

Some photosynthetic bacteria such as green sulphur bacteria use hydrogen sulphide as the electron donor in place of water. This makes them produce sulphur gas instead of oxygen as a byproduct of photosynthesis.