Most photosynthesis in plants occurs in the leaves, specifically in the chloroplasts found within the leaf cells. The chloroplasts contain chlorophyll, a pigment that absorbs sunlight and helps convert carbon dioxide and water into glucose and oxygen. This process takes place primarily in the mesophyll cells, located in the middle layer of the leaf. The large surface area of the leaf allows it to capture maximum sunlight, making it the most efficient part of the plant for photosynthesis. Additionally, the stomata, small pores on the leaf surface, enable gas exchange, further supporting this vital process.