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Environmental Issues

Question

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Relationship between DO and BOD is that they

are directly proportional

are inversely proportional

are not related

always remain equal to each other

Solution

B.

are inversely proportional

BOD or 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 or 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 there's 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.

Some More Questions From Environmental Issues Chapter

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Which one of the following is not a green-house gas ?

Which gas contributes the maximum in global warming ?

Fill in the blanks with suitable words :
1. Increase in concentration of soluble salts in the soil is called.........

2. Aforestation can check the advancement of......... .

3. DDT is a serious pollutant as it is a.........pollutant and undergoes......... .

4 .........plant has become a troublesome weed in agricultural fields.

5 .........are major aerosol pollutant present in jet aircraft emission.

Write “True” or “False” :

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