Oxygen is only produced

Oxygen is only produced from the photosynthesis of water, instead of carbon dioxide. This was first revealed by C.B. Neil van who studied photosynthetic bacteria in the 1930's. Photosynthetic bacteria, in addition to cyanobacteria, use does not produce oxygen as it uses ionization or hydrogen sulfide.At the same time the ionization photosystem II, photosystem I light also ionizes, releasing electrons are transferred along the electron transport chain which ultimately reduces NADP into NADPH.
Dark Reaction
ATP and NADPH produced by the photosynthetic process triggers a variety of biochemical processes. In plants, the biochemical triggers is the Calvin cycle that binds the carbon dioxide to form ribulose (and then into sugar such as glucose). This reaction is called the dark reactions because it does not depend on the presence or absence of light so that it can occur even in the dark (without light). (Hardianto, 30: 2004)