Question

Water filled in two glasses A and B have BOD values of 10 and 20 respectively. Then choose the correct statement(s):

• A. Amount of $O_2$ required by bacteria to break down microorganisms present in glass A is more than that of glass B
• B. Amount of $O_2$ required by bacteria to break down microorganisms present in glass B is more than that of glass A
• C. Glass A is more polluted than B
• D. Glass A is less polluted than B

Answer 1

Answer: (B), (D)

Glass A is less polluted than B

BOD :
The amount of oxygen required by bacteria to break down organic matter present in a certain volume of a sample of water.
So, amount of $O_2$ required by bacteria to break down microorganisms present in glass B is more than that of glass A and consequently glass A is less polluted than that of B