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41.

Over-all mineral level of soil recedes due to:

A.	Leaching only	B.	Utilization by plants
C.	Both (a) & (b)	D.	Chemical reactions

42.

Odum has described soil erosion as:

A.	Soil pollution	B.	Creeping death of soil
C.	Loss of living stratum	D.	Loss of feeding zone

43.

A slopy land on account of continued rainfall initially under goes:

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

44.

The amount of soil lost to sea each year due to rainfall is around:

A.	3,000 million tons	B.	3,000,000 million tons
C.	3,00,00,000 million tons	D.	3,00,000 billion tons

45.

The chief cause of accelerated erosion is:

A.	Excessive rains	B.	Wind storms
C.	Overfelling and overgrazing	D.	All of these

46.

The soil erosion on slopes proceeds in the following manner:

A.	Gully ? Rill ? ravine	B.	Rill ? Ravine ? Gully
C.	Rill ? Gully ? Ravine	D.	Ravine ? Rill ? Gully

47.

Wave erosion is more prevalent and well marked:

A.	Along rivers	B.	At the sea shore
C.	In water falls	D.	In all these places

48.

Soil conservation is the process where:

A.	Sterile soil is converted into fertile soil	B.	Soil is aerated
C.	Soil erosion is allowed	D.	Soil is protected against loss

49.

The plants commonly sown for crop rotation are :

A.	Cajanus and Dalbergia	B.	Cajanus and Aeschynomene
C.	Dalbergia and trigonella	D.	Trigonella and Trifolium

50.

In dry farming initially the fertility of the land can be increased by:

A.	Agrostology	B.	Basin listing
C.	Growing grazing fields	D.	Animal husbandry