The given graph shows changes in concentration of two substances X and Y in a river polluted by sewage. Which of the following options most appropriately identify X and Y ?

X - Carbon dioxide, Y - Nitrogen compounds

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X - Nitrogen compounds; Y - Carbon dioxides

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X - Nitrogen compounds; Y - Oxygen

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X - Oxygen; Y - Nitrogen compounds

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Solution

The correct option is D X - Oxygen; Y - Nitrogen compounds
When sewage is added to the river the conc. of X curve shows opposite bell curve to the conc. of Y curve which is bell shaped because sewage contains maximum amount of nitrogenous or ammonium compounds which is ingested slowly by the oxygen to decompose the sewage so the oxygen is consumed upstream to degrade nitrogenous compounds.

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