With increasing water pollution, the BOD levels:
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Answer: B. Increases
Explanation
Increasing water pollution introduces large amounts of organic compounds into aquatic river and lake ecosystems. Microorganisms consume these organic pollutants rapidly through aerobic respiration processes that deplete dissolved oxygen supplies. Higher microbial activity directly corresponds to an elevated biochemical oxygen demand measured in polluted water samples. Biochemical oxygen demand measures the amount of dissolved oxygen needed by aerobic biological organisms to break down organic material. Untreated industrial effluent and municipal sewage are primary contributors to high organic pollution in waterways. Severe oxygen depletion resulting from high BOD levels can lead to massive fish kills and aquatic dead zones.
Decreasing BOD levels would indicate improving water quality with fewer organic pollutants for bacteria to consume. Remaining the same is impossible because decomposing organic waste continuously alters the oxygen consumption rate. Stating it is no measure of pollution contradicts standard environmental chemistry and water quality testing protocols.
- Subject
- Agriculture
- Category
- Forestry
- Topic
- —
- Difficulty
- medium
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