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41. How is air pollution responsible for changing the ill-effects of ultraviolet radiation ?

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42. Write a note on Biological Oxygen Demand (B.O.D.).

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43. What is organic farming ?

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44. What is ‘terror of Bengal’ ?

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45. What is water logging and salinity ?

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Consequences of deforestation are:

(1) Increase in the carbon dioxide concentration of the atmosphere beacuse of the loss of trees.

(2) Loss of biodiversity due to habitat destruction.

(3) Disturbance of the hydrological cycle.

(4) Soil erosion which may lead to desertification in extreme cases.

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47. List any three laws passed by Indian government to control pollution.

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48. Define pollution. Compare the biodegradable and nonbiodegradable pollutants.

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49. Define pollutant.

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50. What is air pollution ? List various air pollutants.

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