Biochemical oxygen demand measures

Study the graph given below and answer the questions that follow: What is the relationship between dissolved oxygen and biochemical oxygen demand (BOD)?

Determination of Biochemical oxygen Demand (BOD) can help in suggesting the quality of a water body. Explain.

What is biochemical oxygen demand (BOD)? Write the BOD of pure water.

What is the difference between biological oxygen demand and chemical oxygen demand? What is the effect of a higher biological oxygen demand on the level of dissolved oxygen and sensitive organisms in a water body?

What is chemical oxygen demand (COD) ?

Explain the following terms : Chemical Oxygen demand

Write a note on Biological Oxygen Demand (BOD).

Biochemical cycle with gaseous phase is