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31.

The cutting of trees from the forests of hill near a catchment area:

A.	Will have no effect on causing floods in plain	B.	May cause flood in plains in rainy season
C.	Will have no effect on climatic condition of that area	D.	Will benefit the mankind for more area for cultivation

32.

Grasses possess great regenerative power because they are:

A.	Dominat species	B.	Rhizomatous
C.	Constantly grazed	D.	fast growing

33.

To prevent wind and water erosion, the crop is sometimes harvested in such a way that a basal stub of the plant is left behind. This phenomenon is called:

A.	Ley farming	B.	Mulching
C.	Basin listing	D.	Strip cropping

34.

Soil erosion in plains consequent to rain fall is initiated by:

A.	Rill erosion	B.	Sheet erosion
C.	Gully erosion	D.	All of these

35.

The term riparian erosion is applied to:

A.	Gully erosion	B.	Slip erosion
C.	Wind erosion	D.	Stream bank erosion

36.

It occurs under normal conditions:

A.	Geological erosion	B.	Surface creep
C.	Both (a) & (b)	D.	Accelerated erosion

37.

Erosion of very fine particles is seen on account of:

A.	Saltation	B.	Suspension
C.	Surface creep	D.	Shifting of dunes

38.

If the top soil has been eroded, we retire a land and grow over it:

A.	Lichens	B.	Blue-green algae
C.	Legumes	D.	Grasses

39.

If the same crop is repeatedly grown in a field:

A.	Nitrogen starvation many result	B.	Specific mineral deficiency may arise
C.	Soil will become prone to diseases	D.	Water level in soil will recede

40.

Bunds, dams and drains are constructed to prevent:

A.	Stream bank erosion	B.	Sheet erosion
C.	Slip erosion	D.	Gully erosion