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What is biological oxygen demand ?...

What is biological oxygen demand ?

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Biological Oxyen Demand is otherwise called as Biochemical Oxygen Demand (BOD).
BOD refers to the amount oxygen, consumed for the complete oxidation of organic matter present in one liter of water by bacteria.
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Assertion: The Biological Oxygen Demand (BOD) is high in raw sewage. Reason: The greater the BOD in waste water, the lesser is its polluting potential.

High value of BOD (biochemical oxygen demand ) indicates that: