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 identifies X and Y?

X-Carbon dioxide, Y-Nitrogen compounds

X-Nitrogen compounds; Y-Carbon dioxide

The given graph shows changes in concentration of two substances X and

1.	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 identifies X and Y?
A.	X-Carbon dioxide, Y-Nitrogen compounds
B.	X-Nitrogen compounds; Y-Carbon dioxide
C.	X-Nitrogen compounds; Y-Oxygen
D.	X-Oxygen; Y-Nitrogen compounds
Answer» E.

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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 identifies X and Y?

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