Question

What is Bio-chemical Oxygen Demand (BOD)?

• A. The amount of toxic chemicals in water.
• B. The rate of water flow.
• C. The amount of oxygen required by micro organisms to decompose biological matter in water.
• D. The temperature of the water.

Answer 1

Answer:

C. The amount of oxygen required by micro organisms to decompose biological matter in water.

• The amount of oxygen required by micro organisms to decompose biological matter in a given volume of water is referred to as Bio-chemical Oxygen Demand (BOD).

• The BOD value of clean water is below 5 ppm.

• The BOD value of polluted water is more than 17 ppm.

• Nutrient-rich water bodies lead to excessive plant growth, resulting in oxygen depletion, which kills aquatic life and leads to a loss of biodiversity. This phenomenon is known as Eutrophication.