Chemoautotrphic bacteria:

They do not contain photosynthetic pigments and therefore they can’t use sunlight energy. Rather they acquire energy in the form of ATP by oxidizing organic or inorganic compounds. The energy therefore obtained is utilized to decrease CO₂ to organic matter. Based on the kind of substance oxidized they might be:

1. Chemolithotrophs: 

Inorganic compound is oxidized to release energy. Example: Sulphur bacteria (example: Thiobacillus), Iron bacteria (example: Ferrobacillus), Hydrogen bacteria (example: Hyderogenomonas and Nitrifying bacteria (example: Nitrosomonas and Nitrobacter).

2. Chemo-organotrophs:

In this kind, it is an organic compound which is oxidized to liberate energy. Example: Methane bacteria (i.e., Methanococcus).

Acetobacteria and Lactobacillus are also illustrations for chemo-organotrophs.

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