What is the relation between dissolved oxygen,BOD, water pollution. state a relation with reason.

BOD  refers to biological oxygen demand. when BOD increases water pollution also increses.also when BOD increases dissolved oxygen decreses.

when water gets pollutred it contains a large amount of organic matter .microbes will grow there and they start consuming the organic matter.this process requires oxygen and the dissolved oxygen gets utilised .so the ​dissolved oxygen decreses and othe aquatic organisms die.

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