Question

If in any water body, there is high BOD value then it is generally 

(a) very clean

(b) very polluted

(c) highly productive

(d) highly unproductive

Answer 1

(b) very polluted

Biochemical Oxygen Demand is a me amount of dissolved oxygen (DO) that is used by aerobic microorganisms, when decomposing organic matter in water. It indicates the amount of organic matter present in water.

Therefore, a low BOD is an indicator of good quality water, while a high BOD indicates polluted water.