Bacteria are unicellular organism microorganisms.Based on how they how they process food, they are classified as autotrophic and heterotrophic bacteria.
Heterotrophic bacteria:These bacteria are not able to manufacture their own food, they depend on external source.They are further classified into three types:1.Saprophytic Bacteria 2.Symbiotic bacteria and parasitic bacteria.
Autotrophic bacteria: They are bacteria which can prepare their food themselves from inorganic substances like carbondioxide, hydroge and oxygen.Based on what kind of energy they use in preparing their food, they are again categorized as Photoautotrophic bacteria and Chemosynthetic bacteria.Photoautotrophic bacteria get energy from the sun.Chemosynthesis bacteria uses energy which is liberated from the oxidation of inorganic substances.
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