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प्रश्न
What do you mean by Biochemical Oxygen Demand (BOD)?
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उत्तर
Biochemical oxygen demand is the amount of oxygen required by bacteria to decompose organic matter in a certain volume of sample of water. Clean water would have a BOD value of less than 5 ppm, whereas highly polluted water has a BOD value of 17 ppm or more.
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संबंधित प्रश्न
An example of non-biodegradable waste is
A. Vegetable peels
B. Sewage
C. Livestock waste
D. DDT
_________ is used for desalination of brackish water.
Classify the given sources of water pollution as natural and manmade:
(1) domestic waste
(2) dead animals
(3) oil spills
(4) ashes released due to forest fires
Study the picture given below and answer the following questions :
Mention the impact of this pollution on human health.
List the three major constituents of sewage.
Answer the following question:
Name two human diseases caused due to water pollution.
How could warm water act as a pollutant?
Water pollution can spread ________ diseases in man.
Excessive use of chemical fertilizers depletes the soil and causes water pollution.
______ of the world population does not get safe drinking water.
