Question

Biochemical Oxygen Demand (BOD) may not be good index for pollution for water bodies receiving effluents from

• A. sugar industry
• B. domestic sewage
• C. dairy industry
• D. petroleum industry

Answer 1

The correct option is D petroleum industry

Biochemical oxygen demand (BOD), the amount of dissolved oxygen used by microorganisms in the biological process of metabolizing organic matter in water. The more organic matter there is (e.g., in sewage, sugar industry, dairy industry), the greater the BOD.
Biochemical Oxygen Demand (BOD) is not a good index for checking the pollution levels of water bodies receiving effluents from petroleum industry. This is because such effluents contain waste which is non-biodegradable.