Creatas Images/Creatas/Getty Images. Photosynthesis is the process through which an organism internally makes food by breaking down sunlight. Organisms that make food through photosynthesis are classified as autotrophs, as opposed to heterotrophs, which must consume other organisms to make their food.The kingdoms which contain photosynthetic organisms are Monera, Protista and Plantae.TPs are then used to power reactions in the cell that produce glucose, the primary sugar used to fuel the cell's activities. The light used in the reaction for photosynthesis is absorbed by chlorophyll, an organelle in the cell, that is able to take in red or blue light.