Chloroplasts are the organelles within plant and algal cells where photosynthesis occurs.The oxidation-reduction reactions involved in oxidation of water, reduction of NADP+, and synthesis of ATP via a chemiosmotic mechanism are located in the thylakoid membranes of the chloroplast. The soluble enzymes involved in the synthesis of glucose from carbon dioxide and water, and utilizing the ATP and NADPH produced during the light reactions are in the stroma compartment of the chloroplast.