51.
Phosphorus cycle is in the form of

52.
Which one of the following is a direct ecological factor?

53.
The most severe pollutant of metals and materials is

54.
Environmental Science may be defined as

55.
All the cases of forests land should be approved by

56.
In case of CO2 of earth's atmosphere disappears, the temperature of earth's surface would

57.
Terrestrial life would become impossible with

58.
Chlorofuorocarbons release which of the following chemicals which is harmful to ozone layer

59.
Who coined the term biosphere?

60.
DDT is banned because

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