Measuring Biochemical Oxygen Demand (BOD) is a method used for: A Estimating the amount of organic matter in sewage water B Working out the efficiency of oil driven automobile engines C Measuring the activity of Saccharomyces cerevisae in producing curd on a commercial scale D Working out the efficiency of RBCs about their capacity to carry oxygen
Correct option is A) Degree of pollution or impurities in water due to organic matter is measured in terms of 'Biological Oxygen Demand' or BOD. Biological oxygen demand or BOD is the oxygen in milligrams required for five days in one litre of water at 20 degree centigrades for the microorganisms to metabolise organic waste. Low pollution level is indicated by below 1500 mg/lit, medium pollution level is indicated by 1500 to 4000 mg/lit and high organic pollution level is indicated by above 4000 mg/lit.
