Chapter 10 Photosynthesis The production of organic fuel from energy Carbon dioxide + water + energy organic compounds + oxygen Is a redox reaction Water is split and electrons transferred with H+ from H2O to CO2, reducing it to sugar Autotrophs: ?producers? able to produce their own organic compounds Produce their own organic molecules from CO2 and other inorganic raw materials obtained from the environment Heterotrophs: ?consumers? who must obtain organic compounds from other organisms or substances Where does photosynthesis occur? Chloroplasts in the leaves of plants Chloroplasts are found mainly in mesophyll cells forming the tissues in the interior of the leaf O2 exits and CO2 enters the leaf through microscopic pores called stomata in the leaf