A) biological oxide demand
B) biological oxygen deduction
C) basic oxygen demand
D) biological oxygen demand
Correct Answer: D
Solution :
BOD stands for Biological Oxygen Demand, which is defined as the amount of oxygen required for biological oxidation by microbes in any unit volume of water. As it gives the amount of oxidisable organic matter, thus it is used as a measure of degree of water pollution and waste level. Its value is proportional to the amount of organic wastes present in water. Water quality can also be measured by COD. In COD (Chemical Oxygen Demand), organic compounds are oxidised chemically instead of biologically. Thus, it takes less time. In this, potassium dichromate is used as oxidizing agent.
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