The diagram below shows the effect of polluting a river with untreated whey. What does graph X represent ?

Number of Zooplanktons

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Bacterial count

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Mass of curds

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Concentration of rennet

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Solution

The correct option is B Bacterial count
Following is the labelled diagram of the given diagram-

Since the BOD is varying in the graph X, which needs bacteria or oxidizing microbes to oxidize the organic matter.
Hence, the graph X represents the bacterial count.

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