31.
Ozone shield is component of

32.
Lichens indicate pollution of

33.
The geothermal energy utilises potential of

34.
Biosphere is

35.
The most favoured habitat of plant is called

36.
The Troposphere extends to a height of

37.
Peculiar smell coming out of water is due to

38.
Most harmful type of environmental pollutants are

39.
Which of the following cause damage to blood?

40.
Cardinal temperature refers to

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