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Measuring Biochemical Oxygen Demand (BOD) is a method used for:

1. estimating the amount of organic matter in sewage water.
2. working out the efficiency of oil driven automobile engines.
3. measuring the activity of Saccharomyces cerevisiae in producing curd on a commercial scale.
4. working out the efficiency of RBCs about their capacity to carry oxygen.

Correct answer: estimating the amount of organic matter in sewage water.

Solution

Biochemical Oxygen Demand measures the oxygen used by microorganisms while decomposing organic material in water. A higher BOD indicates more organic pollution, which is why it is used to estimate organic matter in sewage water.

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