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.he Monera Kingdom (which is divided into two kingdoms, the Eubacteria and Archeobacteria) are microscopic, single-celled organisms that are the simplest known forms of life.