End products of photosynthesis is glycerate-3-phosphate which is used to make sugar and RuBP.

C02 + ribulose biphosphate ------>(catalyst by riubisco) -----> 6C compound(unstable) -----> glycerate-3-phosphate ---->(ATP->ADP+P)---->(NADPH->NADP + H)----> trise phosphate ----->sucrose

Light independent stage. During Calvin cycle, RuBP used with Co2 to form glycerate-3-phosphate which can be used to form sugar(food).

Yes. During glycolysis, arsenate which has a similar structure to phosphate replaces it from glyceraldehyde-3-phosphate to form an unstable arsenate anhydride( 1-arsenato-3-phospho-d-glycerate) that hydrolyzes to form arsenate and 3-phosphoglycerate. In the absence of phosphate, ATP is not formed in the reaction. ADP-arsenate is formed from ADP and arsenate in the presence of succinate. The formation of easily hydrolyzable ADP-arsenate complex uncouples oxidative phosphorylation and causes arsenolysis.

Light-independant reactions(Dark Reactions) use Carbon Dioxide and other compounds to create Glucose.