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: The two main methods of nutrition are autotrophic and heterotrophic. These are further divided into different types as follows:

Autotrophic nutrition
In this type, the organisms synthesize their own food. It is of two types:
1) Photoautotrophic - The source of energy is sunlight.
2) Chemoautotrophic - The source of energy are the chemicals.

Heterotrophic nutrition
In this type, the organisms are directly or indirectly dependant on the autotrophs. It is of the following types:

1) Holozoic - The organisms ingest food and then digest, absorb and assimilate it.
2) Saprotrophic - The orgainsms feed on dead plants and animals digesting them before feeding.
3) Symbiotic - The association between dissimilar individuals. May be
4) Mutualistic - where both the partners benefit.
5) Parasitic - where one partner benefits and the other is harmed.
6) Commensalism - where one partner benefits and the other is not affected

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