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Microbes in Human Welfare — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYMicrobes in Human Welfare2 Marks
Question
Study the graph given below. Explain how is oxygen concentration affected in the river when sewage is discharged into it.
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Answer

Oxygen is used up by microorganisms involved in biodegradation resulting in sharp decline at the point of sewage discharge, the concentration of oxygen increases as we move farther from the point of sewage discharge.

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