Question

Which one of the following categories of organisms does not involve oxygen during photosynthesis?
A. Red algae
B. Photosynthetic bacteria
C. \[{C_4}\] plants with Kranz anatomy
D. Blue-green algae

Answer 1

Hint: Photosynthetic can be performed without involving the production of oxygen in some microorganisms. This is due to the presence of the proton and electron donor which is not water. During photosynthesis, oxygen is not produced.

Complete answer:
Photosynthetic bacteria are capable of entrapping solar energy and utilizing it for the synthesis of really complex food materials really due to the presence of pigments like bacteriochlorophyll and bacterioviridin, which specifically is quite significant. Bacterial photosynthesis is also known as an oxygenic photosynthesis, which is quite significant. In bacterial photosynthesis, water essentially is not the source of the electron that acts as a reducing agent to kind of convert carbon dioxide into glucose. The bacteria obtain reducing power from various compounds pretty such as hydrogen sulfide, thiosulphate, or even some organic compounds, definitely contrary to popular belief. No oxygen specifically is evolved as it does not for the most part involve splitting of water, demonstrating how no oxygen generally is evolved as it does not specifically involve splitting of water, generally contrary to popular belief. Hydrogen released by various compounds, for the most part, is generally picked up by \[NA{D^ +}\] which gets reduced to \[NAD{H_2}\]​acting as reducing power, showing how in bacterial photosynthesis, water generally is not the source of the electron that acts as a reducing agent to for all intents and purposes convert carbon dioxide into glucose in a big way. \[NAD{H_2}\]​along with \[ATP\], produced generally by entrapping solar energy kind of are used to reduce carbon dioxide ​to glucose, demonstrating that no oxygen is evolved as it does not generally involve splitting of water, demonstrating how no oxygen specifically is evolved as it does not subtly involve splitting of water. The byproduct of bacterial photosynthesis is sulfur, so the bacteria obtain reducing power from various compounds generally such as hydrogen sulfide, thiosulphate, or even some organic compounds in a pretty major way.

Hence, the correct answer is option (B).

Note: The ability to use water as an electron donor is not possessed by any of the oxygenic phototrophic bacteria. By using sulfide, hydrogen, or organic substrates basic photosynthesis is performed.