______________Fixes Atmospheric Nitrogen Useful To Plants.
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Solution
Nitrogen-fixing bacteria:
Nitrogen-fixing bacteria are primarily prokaryotic microorganisms that cannot be seen with the naked eye.
These nitrogen-fixing microorganisms could be either free-living or symbiotic in nature.
Nitrogen-fixing bacteria contain the enzyme nitrogenase, which is capable of nitrogen reduction.
Free-living Azotobacter, Beijernicika, and Clostridium are nitrogen-fixing aerobic bacteria.
Rhizobium, which is connected with leguminous plants, Frankia, which is linked with actinorhizal plants, and Azospirilum, which is associated with cereal grasses, are examples of symbiotic nitrogen-fixing bacteria.
Final answer: Nitrogen-fixing bacteria fixes atmospheric nitrogen useful to plants.