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Biofertilisers include

$\begin{array}{1 1}(A)\;\text{Cowdung manure and farmyard waste}\\(B)\;\text{A quick growing crop ploughed back}\\(C)\;\text{Anabaena and Azolla}\\(D)\;\text{All the above}\end{array} $

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Biofertilisers include Anabaena and Azolla
Hence (C) is the correct answer.
answered Jul 16, 2014 by sreemathi.v
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