1. With respect to the Biological Oxygen Demand (BOD), consider the following statements:
- 1.It is the amount of dissolved oxygen needed by microorganisms to decompose organic matter under anaerobic reaction.
- 2.The more organic matter there is the greater is the BOD; and the greater the BOD, the lower the amount of dissolved oxygen available for higher animals such as fishes.
- 3.A higher BOD level means that more oxygen is needed to decompose a large quantity of organic matter present in the water.
Which of the statement(s) given above is/are correct?