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Azolla enriches rice fields with nitrogen due to its association with

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

1 Answer

Azolla enriches rice fields with nitrogen due to its association with anabaena
Hence (A) is the correct answer.
answered Jul 15, 2014 by sreemathi.v
 
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