Zoology - Microbes in Human Welfare Question with Solution | TestHub

Biochemical Oxygen demand is the amount of oxygen, present in water, taken up by bacteria and other microorganisms to degrade organic matter present in water. BOD estimates the organic matter in water. If there is a high amount of organic matter in water, there will be increased consumption of oxygen by microbes for the degradation of organic matter. Hence BOD is determined by the amount of consumption of oxygen by microbes. An increase in BOD results in a decrease in oxygen in the water.