Introduction of Photoautotrophs with its types

Phptoautotrophs are such types of bacteria which synthesize their own food in presence of sunlight . They use CO₂ of nature to prepare their food . They use hydrogen from water,H₂S and hydrogen toreduce carbondioxide . These bacteria have the pigment bacterioviridin, bacteriochlorophyll or chlorobium chlorophyllthat trap the light for synthesize. Photoautotrophs are of following types.

1) Purple sulphur bacteria

2) Purple non sulphur bacteria

  3) Green sulphur bacteria