. Free living bacteria present in the soil which can fix atmospheric nitrogen.

(a)       Methanomonas        

(b)       Myobacterium           

(c)       Clostridium    

(d)      Azotobacter

Best Answer

(d)       These bacteria utilize atmospheric nitrogen for their protein synthesis. These proteins are then mineralized after the death of Azotobacter cells thereby contributing towards the nitrogen availability of the crop plants. Azotobacter also produces some substances which check some plant pathogens.

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