Biochemical Oxygen Demand (BOD) value can be a measure of water pollution caused by the organic matter. Which of the following statements is correct ?
- AAerobic bacteria decrease the BOD value.
- BAnaerobic bacteria increase the BOD value.
- CClean water has BOD value higher than 10 ppm.
- DPolluted water has BOD value higher than 10 ppm.
✓ Correct answer: D
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