Photosynthesis is the process carried out by the plants to convert light energy into chemical energy, which later on released to other organisms from the plant. Synthesis of each molecule of glucose in photosynthesis involves 18 ATP units. The reaction occurs during photosynthesis is as follows 6CO2+18ATP+12NADPH───▸C6H12O6+18P+12NADP++18ADP.6H2O