31. 21st March is observed as
32. 71% of earth surface is covered with:
33. According to Thomas Malthus human population increase in
34. Afforestation is necessary for
35. Air pollution is caused by
36. Atmosphere may extents to a height of about following kms above the earth surface
37. Atomospheric ozone layer which protect us from UV-B & C is getting depleted most by addition of
38. Chipko movement was started to conserve
39. Consumers are also called
40. Conversion of ammonia to nitrite and then nitrate is called
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