question_answer 51)

  Is it true that if the dissolved oxygen level drops to zero, the water will become septic. Give an example which could, lower the dissolved oxygen content of an aquatic body.

Answer:

                  Yes, it is true, in case of zero level of dissolved oxygen (DO), the water becomes septic. Organic pollution like fertilizer in aquatic bodies is responsible for lowering (up to zero) the level of dissolved oxygen.