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31. What according to the CPCB causes greatest harm to the human health ?

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32. What are secondary pollutants ? Give two examples.

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33. Which pollutant is released from the paddy fields ?

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34. Name two non-biodegradable pollutants.

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35. Why is CNG better than diesel ?

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36. What is cultural or accelerated eutrophication ?

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37. List the metals obtained by recycling of e-wastes.

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38. Name the eye diseases caused due to absorption of high dose of UV-B by the cornea?

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39. What is the effect of UV-B radiations on plants ?

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40. What are chlorofluorocarbons and aerosols ? Write the sources and mechanism of the effects of chloroflorocarbons.

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