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If BOD of river is high

$\begin{array}{1 1}(a)\;\text{The river is polluted with pesticides}\\(b)\;\text{Not polluted}\\(c)\;\text{Very much polluted with inorganic chemicals}\\(d)\;\text{Very much polluted with organic chemicals which are decomposed by micro-organisms}\end{array}$

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Very much polluted with organic chemicals which are decomposed by micro-organisms.
Hence (d) is the correct answer.
answered Jan 20, 2014 by sreemathi.v
 
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