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Which of the following is free-living aerobic and nonphotosynthetic nitrogen fixing bacterium

$\begin{array}{1 1}(A)\;\text{Rhizobium}\\(B)\;\text{Nostoc}\\(C)\;\text{Azospirillum}\\(D)\;\text{Azotobacter}\end{array} $

1 Answer

Azotobacter
Hence (D) is the correct answer.
answered Jul 16, 2014 by sreemathi.v
 
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