31.
Types of forests found near equator are

32.
B.O.D. is related to

33.
The inexhaustible power is

34.
Disposal of flyash is carried out in

35.
Humus is defined as

36.
Soil Conservation is

37.
Which ecological cycle is directly driven by sunlight?

38.
The entire inhabited part of the earth and its atmosphere including the living components forms

39.
Humus is an example of

40.
At what height over the earth does the ozone layer exist?

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