On The basis of nutrition bacteria are divided into two groups
1) Autotrophs
2) Heterotrophs
Bacteria that can synthesise all their organic compounds are called Autotrophs

Some bacteria are unable to synthesise their own food. They depends in the performed organic compounds. They are called heterotrophs.
Autotrophs are divided into 2 types
A) Photoautotrophs
B) Chemoautotrophs
Heterotrophs are divided into three types
A) Saprophytic bacteria
B) parasitic bacteria
C) symbiotic bacteria

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