Single correct option
A very high value of Biochemical Oxygen Demand (BOD) in a water sample indicates
- A. clean and fresh water
- B. high level of dissolved oxygen
- C. presence of only heavy metals
- D. heavy pollution by organic matter
Show answer and solution
Answer: (D) heavy pollution by organic matter
BOD is the oxygen consumed by microbes to break down the organic waste in water. A high value shows plenty of such waste and so the water is polluted, with little oxygen left for fish. Clean water has a low BOD. Heavy metals are not measured by BOD.
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