Because of Biochemical Oxygen Demand (BOD), the dissolved oxygen (DO) of a…

2024

Because of Biochemical Oxygen Demand (BOD), the dissolved oxygen (DO) of a water body:

  1. A.

    Increases

  2. B.

    Decreases

  3. C.

    Remains unchanged

  4. D.

    Initially increases and then decreases

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Correct answer: B

Biochemical Oxygen Demand (BOD) measures the amount of oxygen consumed by microorganisms while decomposing organic matter in water. High BOD indicates significant organic pollution, stimulating microbial growth and activity. As these microorganisms respire, they consume dissolved oxygen (DO) from the water. Therefore, an increase in BOD leads to a decrease in dissolved oxygen levels.

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