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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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46. List the consequences of deforestation.

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

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Pollution. is any undesirable change in physical,chemical or biological characteristics of air, land, water or soil.

Differences between biodegradable and non-biodegradable pollutants

Biodegradable Pollutants

Non-biodegradable Pollutants

1. These wastes can be broken down into harmless substances by bacteria.

2. The disposal of biodegradable wastes is easy . Example. Cattle dung.

1. These cannot be broken down into harmless substances by bacteria.

2. Their disposal is not easy and is a major problem.

Example. D.D.T., Plastics.

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49. Define pollutant.

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

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