Multiple choice

Biochemical oxygen demand is __________ in polluted water and ____________ in potable water.

  1. more, less

  2. less, medium

  3. medium, more

  4. less, more

  5. more, more
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Biochemical oxygen demand is more in polluted water and less in potable water. A low BOD is an indicator of good quality water, while a high BOD indicates polluted water. There are generally no standards for an absolute BOD value of drinking water. However, a sample with a BOD between 1 and 2 mg/L indicates a very clean water.

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