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photorespiration. In a plant cell, the breakdown of a two-carbon compound produced by the Calvin cycle. The Calvin cycle produces the two-carbon compound, instead of its usual three-carbon product G3P, when leaf cells fix O2, instead of CO2. Photorespiration produces no sugar molecules or ATP.
Confidence votes 4. sugar (usually glucose) is broken into 3 carbon sugars which are oxidized to make carbon dioxide. The remaining atoms form 2 pyruvate molecules per every one glucose molecule. This process is called glycolysis and produces a net gain of 2 ATP's (ATP=energy).hotosynthesis, which is the process of using the energy of sunlight to power the production of sugar (glucose), takes place in the chloroplast of the plant cell. 10 people found this useful. Edit.