sentences: a plant requires sunlight for photosynthesis
docs: photosynthesis is process. sunlight is energy. photosynthesis_in_plants is general_photosynthesis. photosynthesis is photo_chemical_process. photosynthesis_in_plants is physiological_process. photosynthesis is chemical_process. sunlight is solar_radiation. plants has leaves_to_gather_light general_photosynthesis is production. photosynthesis is process_by_which_leaf_makes_food.