Final answer:
The light energy in photosynthesis is converted into chemical energy that is stored in sugar molecules like glucose, which is utilized as ATP.
Step-by-step explanation:
The chemical reaction that occurs in a plant during photosynthesis can be summarized as water + carbon dioxide + light energy → sugar + oxygen. According to the law of conservation of energy, the light energy in the reaction is converted into chemical energy stored in the sugar (glucose). This stored chemical energy is primarily in the form of adenosine triphosphate (ATP), which is used as the primary energy currency of all cells.