Definition of Autotroph

An autotroph is an organism that is capable of producing its own food. They use inorganic sources and then convert them into useful substances that can further be utilized and assimilated by other organisms. Such organisms are not dependent on any other organisms. They are considered to be a very important entity of the atmosphere because all other lives are dependent upon them for food.


Plants are autotrophic entities which through the phenomenon of photosynthesis convert carbon dioxide and water into sugars and oxygen. The herbivores depend on these plants and the carnivores feed on these herbivores and hence, form food webs. They form the base of the energy pyramid and fix the energy that would be utilized by other organisms.

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