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What is BOD?...

What is BOD?

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The amount of oxygen consumed by microorganisms is decomposing waste in a sample of sewage water is called BOD.
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Assertion: BOD indicates the extent of water pollution by organic wastes. Reason: Increase in BOD decreases dissolved oxygen of wastewater.

Assertion : The amount of BOD in the water is a measure of the amount of organic material in the water . Reason : Clear water has BOD less than 5 ppm whereas highly polluted water can have BOD value of 17 ppm or more .