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The aquatic fern,which is an excellent biofertilizer is

$\begin{array}{1 1}(A)\;\text{Salvinia}\\(B)\;\text{Azolla}\\(C)\;\text{Marsilea}\\(D)\;\text{Pteridium}\end{array} $

1 Answer

The aquatic fern,which is an excellent biofertilizer is azolla
Hence (B) is the correct answer.
answered Jul 16, 2014 by sreemathi.v
 
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