Multiple choice

Biological oxygen demand (BOD) is the amount of oxygen consumed by microbes to decompose organic matter. It is least in

  1. sewage water

  2. municipal waste water

  3. polluted water

  4. pure water

  5. household waste water

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Biological oxygen demand (BOD) is the amount of oxygen consumed by microbes to decompose organic matter. It is least in pure water.