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Environmental Issues

Question

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Measuring Biochemical Oxygen Demand (BOD) is a method used for

Estimating the amount of organic matter in sewage water

Working out the efficiency of oil driven automobile engines

Measuring the activity of Saccharomyces cerevisae in producing curd on a commercial scale

Working out the efficiency of oil driven automobile engines

Solution

C.

Measuring the activity of Saccharomyces cerevisae in producing curd on a commercial scale

Decomposition of organic matter by microbes requires oxygen. The degree of impurity of water due to organic matter is measured in terms of BOD (Biochemical Oxygen Demand) or BOD is the oxygen in milligrams required for five days in one litre of water at $20 degree straight C$ for the microorganisms to metabolise organic waste.

Some More Questions From Environmental Issues Chapter

WHO’s recommendations about the industrial noise limit is of :

Which of the atmospheric layer contains ozone layer ?

The amount of dissolved oxygen required by the microorganisms to degrade the organic wastes present in water is called ?

The cause of acid rain is :

Which one of the following causes ozone depletion ?

What disease is caused due to consumption of fishes captured from water contaminated with mercury ?

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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