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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