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Following curve represents 3 entities in a following river in which sludge was added.Curve X & Z represent (respectively)

$\begin{array}{1 1}(a)\;\text{ Sludge & Nitrogen } \\ (b)\;\text{Oxygen & Nitrogen} \\(c)\;\text{Oxygen & Microbes} \\(d)\;\text{Nitrogens & Microbes}\end{array}$
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As sludge is added,microbial growth follows and due to aerobic degradation,$O_2$ content decreases.
Hence (c) is the correct answer.
answered Mar 24, 2014 by sreemathi.v

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