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When huge amount of sewage is dumped into a river, its B.O.D. will

1. increase
2. decrease
3. sharply decrease
4. remain unchanged

Correct answer: increase

Solution

When a large amount of sewage is dumped into a river, the organic matter in the sewage increases the activity of decomposers, which consume more oxygen, thereby increasing the Biological Oxygen Demand (B.O.D.).

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