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What is required for nitrogen-fixation by Rhizobium

$\begin{array}{1 1}(A)\;\text{Potassium}\\(B)\;\text{Phosphorus}\\(C)\;\text{Nitrate}\\(D)\;\text{Sodium}\end{array} $

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