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Air And Water Pollution And Their Control Free Doubts and Solutions

CBSE - XII Science - Biology - Environmental Issues

Why is Eichhornia crassipes regarded as ‘Terror of Bengal’?

Asked by Topperlearning User 19th September 2016, 6:16 AM
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CBSE - XII Science - Biology - Environmental Issues

Write the differences between BOD and COD.

Asked by Topperlearning User 19th September 2016, 6:15 AM
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CBSE - XII Science - Biology - Environmental Issues

Describe electrostatic precipitator by a diagram.

Asked by Topperlearning User 16th June 2014, 1:22 PM
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CBSE - XII Science - Biology - Environmental Issues

(a) What depletes ozone in the stratosphere? How does this affect human life? (b) Explain biomagnification of DDT in an aquatic food chain. How does it affect the bird population?

Asked by Topperlearning User 16th June 2014, 1:22 PM
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CBSE - XII Science - Biology - Environmental Issues

Study the graph given below and answer the questions which follow:       (i) What is the relationship between dissolved oxygen and biochemical oxygen (BOD)? (ii) Mention their effect on aquatic life in the river.

Asked by Topperlearning User 16th June 2014, 1:22 PM
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CBSE - XII Science - Biology - Environmental Issues

DDT content in the water of a lake which supplies drinking water to nearby villages is 0.003 ppm. The kingfishers of that area were reported to have 2 ppm of DDT. Why has the concentration of DDT increased in these birds? What harm will this cause to the bird population? Name the phenomenon.

Asked by Topperlearning User 16th June 2014, 1:22 PM
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CBSE - XII Science - Biology - Environmental Issues

State the major causes of air pollution in metro cities. Write any three ways in which it can be reduced.

Asked by Topperlearning User 16th June 2014, 1:22 PM
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CBSE - XII Science - Biology - Environmental Issues

Why is CNG considered a better fuel than diesel for automobiles?

Asked by Topperlearning User 16th June 2014, 1:22 PM
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CBSE - XII Science - Biology - Environmental Issues

Thermal power plants are inevitable in an industrial and densely populated country. What harm do they do to the environment? Also, mention any precaution which could be taken to save our environment.

Asked by Topperlearning User 16th June 2014, 1:22 PM
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CBSE - XII Science - Biology - Environmental Issues

How do automobiles fitted with catalytic converters reduce air pollution? Suggest the best fuel for such vehicles.

Asked by Topperlearning User 16th June 2014, 1:22 PM
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CBSE - XII Science - Biology - Environmental Issues

How can pollution by auto exhaust be minimised?

Asked by Topperlearning User 16th June 2014, 1:22 PM
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CBSE - XII Science - Biology - Environmental Issues

Why is it desirable to use unleaded petrol in vehicles fitted with catalytic converters?

Asked by Topperlearning User 16th June 2014, 1:22 PM
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CBSE - XII Science - Biology - Environmental Issues

Why are lichens regarded as pollution indicators?

Asked by Topperlearning User 16th June 2014, 1:22 PM
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