A) increase in the dissolved \[{{O}_{2}}\] concentration
B) decrease in the dissolved \[{{O}_{2}}\]concentration
C) maintenance of dissolved \[{{O}_{2}}\]concentration at the same level
D) no effect on dissolved \[{{O}_{2}}\]concentration
Correct Answer: B
Solution :
Biochemical Oxygen Demand (BOD) is the oxygen in milligrams required for five days in one litre of water at 20°C for the micro-organisms to metabolise organic waste. Increase of BOD in water leads to decrease in the dissolved oxygen concentration.
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