The plant organ that absorbs the most light for photosynthesis is the leaf. Leaves are specially adapted with a large number of chloroplasts, particularly in the mesophyll cells, where the majority of photosynthesis takes place. The chloroplasts contain chlorophyll pigments that capture light energy efficiently. The leaf surface allows light to pass to palisade mesophyll cells, which are densely packed with chloroplasts, making the leaf the main site for light absorption in plants.