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

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Polluted water has BOD value higher than 10 ppm.

Aerobic bacteria decreases the BOD value.

Anaerobic bacteria increases the BOD value.

Clean water has BOD value higher than 10 ppm.

answer is A.

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Detailed Solution

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

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