Autotroph

An autotroph is an organism that is capable of making nutritive organic molecules from inorganic sources through photosynthesis (involving light energy) or chemosynthesis (involving chemical energy). Autotrophs are the producers in a food chain. Autotrophs can either be photoautotrophs or chemoautotrophs. The reason why this picture contains an autotroph is because it is a plant which creates nutritive organic molecules through sunlight (photosynthesis) and is a producer of a food chain.

Source:
Autotroph. biology-online.org. Retrieved on August 30, 2011, from
http://www.biology-online.org/dictionary/Autotroph