Question

Biochemical oxygen demand(BOD) value can be a measure of water pollution caused by the organic matter. Which of the following statements is correct?

• A. Polluted water has BOD value higher than 10 ppm
• B. Aerobic bacteria decreases the BOD value
• C. Anaerobic bacteria increases the BOD value
• D. Clean water has BOD value higher than 10 ppm

Answer 1

Answer: (A)

Clean water has BOD value less than 5 ppm. Polluted water has BOD value higher than 10 ppm.