Presence of high amounts of organic wastes in the sewage decreases both BOD and DO.

The amount of organic matter in sewage water can be estimated by

Assertion : The amount of BOD in the water is a measure of the amount of organic material in the water . Reason : Clear water has BOD less than 5 ppm whereas highly polluted water can have BOD value of 17 ppm or more .

Read the following statements carefully and find the incorrect statements: A. More than 1 percent impurities make domestic sewage unfit for human use. B. Less BOD causes mortality of fish and other aquatic creatures. C. Presence of large amounts of nutrients in water also causes excessive growth of planktonic algae, called an algal bloom. D. Algai bloom causes deterioration of the water quality an decreases fish mortality. E. Some bloom-forming algae are extremely toxic to human beings and animals. F. Eichhornia crassipies is the world's most problematic aquatic weed.

Presence of more organic wastes in waste water increaso................ but decreases ..................

Statement-1: Water is polluted by organic wastes and Statement-2: The amount of organic wastes is measured by the BOD.

It is possible to estimate the amount of organic matter in sewage water by measuring biochemical oxygen demand. Can you explain how ?

Consider the following statements with respect to pollution. A. To control air pollution problems, by the end of 2002 all the buses of Delhi were converted to run on unrelated petrol B. Electrostatic precipitator can remove over 99% particulated matter present in the exhaust from a thermal power plant. C. It is possible to estimate the amount of organic matterin sewage water by measuring BOD. Of the above statements:

Decreasing order of amount of organic compound in animal body