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What is an autotrophic bacterium?
Solution
Autotrophic Bacteria:
Autotrophic bacteria are prokaryotic unicellular organisms of kingdom monera.
Autotrophic bacteria use inorganic substances to make energy in the form of organic matter. Two
major types are photoautotrophs and chemoautotrophs.
Photoautotrophs obtain energy from sunlight and convert it into chemical energy. Few
phototrophic bacteria also have pigments (lamellae) known as cyanobacteria. The bacterial
photosynthesis is different from that of green plants. Unlike plants oxygen is not released. It is
known as anoxygenic photosynthesis. These bacterial species are useful to remove harmful
carbon dioxide from the atmosphere. The following reaction occurs in presence of light
CO2 +H2S ---------------------------.> Sugars + sulphur + water
Chemoautotrophs use chemical energy. Chemoautotrophs take inorganic raw material and get
energy by oxidation of inorganic substances. The major energy sources for bacteria are
carbohydrates and sugars. Nitrifying bacteria, sulphur bacteria, iron bacteria etc.

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What is an autotrophic bacteriumSolutionAutotrophic Bacteria.pdf

  • 1. What is an autotrophic bacterium? Solution Autotrophic Bacteria: Autotrophic bacteria are prokaryotic unicellular organisms of kingdom monera. Autotrophic bacteria use inorganic substances to make energy in the form of organic matter. Two major types are photoautotrophs and chemoautotrophs. Photoautotrophs obtain energy from sunlight and convert it into chemical energy. Few phototrophic bacteria also have pigments (lamellae) known as cyanobacteria. The bacterial photosynthesis is different from that of green plants. Unlike plants oxygen is not released. It is known as anoxygenic photosynthesis. These bacterial species are useful to remove harmful carbon dioxide from the atmosphere. The following reaction occurs in presence of light CO2 +H2S ---------------------------.> Sugars + sulphur + water Chemoautotrophs use chemical energy. Chemoautotrophs take inorganic raw material and get energy by oxidation of inorganic substances. The major energy sources for bacteria are carbohydrates and sugars. Nitrifying bacteria, sulphur bacteria, iron bacteria etc.