ATP (adenosine triphosphate) in photosynthesis is the primary energy currency of cells. It is produced during the light-dependent reactions of photosynthesis, specifically in the process known as photophosphorylation. In this process, light energy is absorbed by chlorophyll molecules in the thylakoid membranes of chloroplasts, which then drives the synthesis of ATP from ADP (adenosine diphosphate) and inorganic phosphate (Pi). This ATP is subsequently used as an energy source in the Calvin cycle (light-independent reactions) to convert carbon dioxide into glucose and other carbohydrates.
In summary, ATP in photosynthesis serves as the energy carrier that powers the synthesis of organic molecules from carbon dioxide and water using light energy.
