Photosynthesis makes the glucose that is used in cellular respiration to make ATP. The glucose is then turned back into carbon dioxide, which is used in photosynthesis. While water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.
Photosynthesis is in plants and the formula is 6CO2 + 6H2O ----> C6H12O6+6O2
and cellular respiration is C6 H12 O6 + 602 ------> 6O2 + 6H2O so its switched, another difference is that photosynthesis is only for plants and some bacteria, while cellular is in all living organisms.
