Environmental chemistry online 2018 mains
Q.15. Biochemical Oxygen Demand (BOO) value can be a measure of water pollution caused by the organic matter. Which of the following statements is correct ?
1. Clean water has BOD value higher than 10 ppm.
2. Aerobic bacteria decrease the BOD value.
3. Polluted water has BOD value higher than 10 ppm.
4. Anaerobic bacteria increase the BOD value.