61. Sulphur dioxide affects
62. Amount of nitrogen fixed by nitrogen fixing organism per year is about
63. Ozone day is celebrated on
64. Ecological cycling of which of the following in not assisted by microorganisms
65. In recent years, there has been an increasing incidence of floods in Northern India because
66. Silent valley (Kerala) is preserved because
67. Hydrological cycle is under the control of
68. Cadmium pollution is associated with disease
69. Plant die in water-logged soils due to
70. Air pollution is maximum in
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