What are the starting materials of photosynthesis What are the starting materials of of cellular respiration?

The starting materials of photosynthesis are carbon dioxide (CO2) and water (H2O), which, in the presence of sunlight and chlorophyll, produce glucose (C6H12O6) and oxygen (O2). In contrast, the starting materials of cellular respiration are glucose (C6H12O6) and oxygen (O2), which are used to produce carbon dioxide (CO2), water (H2O), and energy in the form of ATP. Thus, these two processes are interconnected, with photosynthesis providing the glucose and oxygen needed for cellular respiration.