a leaf absorbs sunlight to perform photosynthesis
photosynthesis is not chemical_process. photosynthesis is process. leaf is device_for_absorbing_light. photosynthesis is not process. photosynthesis is chemical_process. photosynthesis is process_by_which_leaf_makes_food. photosynthesis is photo_chemical_process. simple_leaf is leaf. leaf is not device_for_absorbing_light. plants has leaves_to_gather_light