FORESTRY
ECOLOGY AND ENVIRONMENT
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
TYPE OF MICROBES
|
|
|
LEVEL OF DISSOLVED OXYGEN
|
|
|
QUANTITY OF ORGANIC MATTER IN SEWAGE WASTE
|
|
|
NONE OF THE ABOVE
|
Detailed explanation-1: -BOD of waste water is refers to the amount of oxygen that would be consumed if all the organic matter in one liter of water were oxidised by bacteria. The BOD test measures the rate of uptake of oxygen by micro-organisms in a sample of water.
Detailed explanation-2: -Biochemical oxygen demand is a measure of organic material present in water. BOD value less than 5ppm indicates a water sample to be rich in dissolved oxygen. For fresh water, the value of BOD is less than 5ppm, while for polluted water value of BOD is 17 ppm or more than 17ppm.
Detailed explanation-3: -Biochemical Oxygen Demand (BOD) is a measure of extent to which water is polluted with organic compound. BOD is higher in polluted sewage water and is connected with microbes and organic matter. More the organic pollution, specially sewage, more would be the BOD of water. Q.
Detailed explanation-4: -BOD is a measure of the amount of oxygen required to remove waste organic matter from water in the process of decomposition by aerobic bacteria (those bacteria that live only in an environment containing oxygen).