Multiple choice

Which of the following enhances BOD of water?

  1. Algae

  2. Sand

  3. Moss

  4. Sugar mill

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

BOD (Biochemical Oxygen Demand) measures how much oxygen microorganisms need to decompose organic matter in water. Sugar mills discharge large amounts of organic waste that increases BOD, potentially depleting oxygen levels for aquatic life. Higher BOD indicates more severe pollution.