Question

The true statement(s) regarding biochemical oxygen demand (BOD) is/are:

• A. $BOD$ will be more for that sample in which a higher amount of organic waste is present
• B. $BOD\propto \text{Dissolved oxygen}$
• C. A sample with lower $BOD$ is more suitable for aquatic life
• D. $BOD$ will be higher for that sample of water which has more number of microorganisms present in the sample

Answer 1

Answer: (A), (C), (D)

The correct options are
A $BOD$ will be more for that sample in which a higher amount of organic waste is present
C A sample with lower $BOD$ is more suitable for aquatic life
D $BOD$ will be higher for that sample of water which has more number of microorganisms present in the sample

• Biochemical oxygen demand increases as the organic waste increases, which is consumed by microorganisms.
• If BOD is higher it means that the dissolved oxygen is less for aquatic life.