A) are directly proportional
B) are inversely proportional
C) are not related
D) always remain equal to each other
Correct Answer: B
Solution :
BOD (Biological Oxygen Demand) is a measure of the amount of oxygen needed by microbes to breakdown the organic matter in a sample of water. DO (Dissolved Oxygen) is the amount of oxygen dissolved in the water. BOD and DO are inversely proportional to each other. When BOD is high, it means theres a lot of organic contaminants in the water and the microbes are working overtime to break it down. They use up oxygen while doing this. So, when BOD is high, Do is low. When the microbes finish breaking down the organic contaminants, their numbers drop due to the lack of food (a lower BOD). Do usually goes back up again.
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