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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
Give one example of A water pollutant.
Study the picture given below and answer the following questions :
Water pollution
Study the picture given below and answer the following questions :
What is a ‘Pollutant’ ? Explain the term.
Which one of the following is a "dirty" practice contributing to pollution and seriously needs stoppage by educating public?
What are some types of pollutants found in water?
Fill in the Blanks:
The release of hot water into rivers causes ______.
Excessive use of chemical fertilizers depletes the soil and causes water pollution.
A pond contains clean water. Which of the following activities will produce least pollution of water?
Give two examples of water pollutants.
Study the picture given below and answer the question:
How does water get polluted?
