Question

BOD is ______ in polluted water and ______ in potable water.

• A. more, less
• B. less, medium
• C. medium, more
• D. less, more

Answer 1

The correct option is A more, less

Biochemical oxygen demand (BOD, also called biological oxygen demand) is the amount of dissolved oxygen needed (i.e., demanded) by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period.BOD is similar in function to chemical oxygen demand (COD), in that both measure the amount of organic compounds in water.So, potable water has less organic compounds than polluted water,so lesser is the BOD.