Bacteria are generally divided into two types on the basis of types of nutrition. They are autotrophic and hetrotrophic. Beside these two bacteria has also been grouped into Photosynthetic and chemosynthetic on the basis of energy source they use for making food. Photosynthetic bacteria are those bacteria which utilize light as source of energy to manufacture food.
Chemsynthetic bacteria are those bacteria which uses energy evolved from oxidation of chemicals that are either or organic or inorganic chemicals as source of energy to manufacture food.
Bacteria can be divided into following four types on the basis of source of carbon and energy they use. They are
1) Photo autotrophs
2) Chemo autotrophs
3) Photo hetrotrophs
4) Chemohetrotrophs
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