WherStudy the diagram, which represents the general equation for photosynthesis. What do the letters Y and Z represent? Y - glucose Z - oxygen Y - glucose Z - carbon dioxide Y - carbon dioxide Z - hydrogen Y - carbon dioxide Z - oxygene in an equation for photosynthesis does oxygen belong? on the left side, because it is a product on the right side, because it is a product on the right side, because it is a reactant on the left side, because it is a reactant