Question

High value of BOD (Biochemical Oxygen Demand) indicates that

• A. Water is pure
• B. Water is less polluted
• C. Consumption of organic matter in the water is higher by the microbes
• D. Water is highly polluted

Answer 1

The correct option is D Water is highly polluted

Biochemical oxygen demand (BOD) is the amount of dissolved oxygen required by aerobic bacteria to oxidise the organic matter present in the sample water at a specific period of time and temperature.

If the BOD level of a water sample is more than the limit, the organic matter present is more, indicating more pollution.

If the BOD level is less, the pollution levels are less.

Final answer

(d) Water is highly polluted