Final answer:
The process of photosynthesis represented by the equation CO2 + H2O --> C6H12O6 + O2 requires sunlight and chlorophyll, which are not listed in the equation but are essential for the process to occur.
Step-by-step explanation:
The equation CO2 + H2O → C6H12O6 + O2 represents the overall process of photosynthesis. To facilitate this process in plants, two critical components not listed in the equation are required: sunlight and chlorophyll. Sunlight provides the energy necessary for photosynthesis, while chlorophyll, found in chloroplasts of plant cells, absorbs this energy and initiates the chemical reactions. These two components enable the conversion of carbon dioxide (CO2) and water (H2O) into glucose (C6H12O6) and oxygen (O2).