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# The amount of oxygen required for healthy growth of plants and animals in water is

$\begin{array}{1 1}(a)\;1-2mg/ml&(b)\;4-6g/ml\\(c)\;1-2g/100ml&(d)\;4-6mg/lit\end{array}$

Can you answer this question?

4-6mg/lit
Hence (d) is the correct answer.
answered Jan 20, 2014