When excess of sewage is dumped in the river, its BOD:
Correct answer: B. Increases
- A. Slightly decreases
- B. Increases
- C. Remains unchanged
- D. Decreases drastically
Explanation
Sewage supplies biodegradable organic matter, so microorganisms consume more dissolved oxygen while decomposing it. This raises the biochemical oxygen demand, or BOD, of the river water.
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