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The amount of oxygen required by bacteri...

The amount of oxygen required by bacteria to break down the organic matter present in a certain volume of a sample of water is called BIOCHEMICAL OXYGEN DEMAND (BOD). Which of the following statements are correct ?

A

(a) The amount of BOD in the water is a measure of the amount of organic material in the water, in the terms of how much oxygen will be required to break it down biologically.

B

(b) Clean water would have BOD value of more than 17 ppm whereas highly polluted water could have a BOD value of less than 5 ppm.

C

(c) Clean water would have BOD value of less than 5 ppm whereas highly polluted water could have a BOD value of more than 17 ppm.

D

(d) Clean water and polluted water both have BOD value of 5 ppm.

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