A River With High BOD Value Is (A) Highly Clean (B) Highly Polluted (C) Highly Productive (D) None Of These

The correct answer is (B) Highly Polluted

Biological Oxygen Demand (BOD) measures the oxygen used by microorganism to decompose the waste. Nitrates and phosphates contribute to a high level of BOD.

The river, which has a high level of BOD, indicates increased pollution in the river as the dissolved oxygen available in the water is being used by the microbes, resulting in a lesser oxygen level available to fish and other aquatic organisms.

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