Photoautotrophic organisms perform photosynthesis without the release of molecular oxygen.
A
always
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B
can
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C
never
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D
cannot
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Solution
The correct option is B can Photoautotrophic organisms may or may not perform photosynthesis with release of molecular oxygen. Molecular oxygen is released when a bacteria uses water molecule as the electron donor. Some bacteria use hydrogen sulphide as electron donor and release molecular sulphur gas as the byproduct.