A) Photosynthetic red algae
B) Photosynthetic green algae
C) Photosynthetic blue-green algae
D) Photosynthetic bacteria
Correct Answer: D
Solution :
Cvanobacteria use two photosystems as in sreen plants. The purple photosynthetic bacterium Rhodospirillum rubrum has single photosystem and the electron donor is H2S which generates S. Several organic compounds and hydrogen gas can be used as electron donor by certain photosynthetic bacteria. Since \[{{H}_{2}}O\] is not used as electron donor, therefore, no oxygen is evolved.
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