carbon dioxide reacts with ribulose bisphosphate (RuBP) to form two molecules of glycerate 3-phosphate (GP). This reaction is catalysed by the enzyme rubisco;
reduced NADP from the light-dependent reaction is used to reduce GP to triose phosphate; energy for this process is provided by ATP.
some of the triose phosphate is used to regenerate RuBP in the Calvin cycle;
Energy from ATP hydrolysis is also needed to regenerate RuBP.
some of the triose phosphate is converted to useful organic substances e.g. glucose.
