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B
oxygen
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C
carbon dioxide
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D
carbon monoxide
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Solution
The correct option is A oxygen
Photosynthesis is a process used by plants and other organisms to convert light energy, normally from the sun, into chemical energy that can be later released to fuel the organisms' activities. This chemical energy is stored in form of ATP which is used for fixation of carbon. During the light reaction, the water undergoes photolysis and produces oxygen which acts as a by-product of photosynthesis.