The plants commonly sown for crop rotation are :
A.Cajanus and Dalbergia
B.Cajanus and Aeschynomene
C.Dalbergia and trigonella
D.Trigonella and Trifolium
Category: Soil Erosion and Conservation Mcqs
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
An important agrostological technique to check soil erosion in the initial stages is:
A.Ley farming
B.Land retirement
C.Basin listing
D.Contour farming
In order to maintain proper ecological balance:
A.The existing forests should be cleared and new ones should be planted
B.Some quick growing anuals should be planted if a tree must be cut for other uses
C.Tree must be cut whenever necessary because the underground part performs the useful purpose
D.A tree should be planted in place of one to be cut
Dark coloured soils are considered most fertile as they contain:
A.Gravel and sand
B.Sand and calcium
C.Clay and humus
D.Silt and earthworms
It occurs under normal conditions:
A.Geological erosion
B.Surface creep
C.Both (a) & (b)
D.Accelerated erosion
Eroded soils are:
A.Rich in plant nutrients
B.Unaltered in plant nutrients
C.Devoid of plant nutrients
D.All of these
Main indicator of soil erosion is:
A.Deforestation
B.Afforestation
C.Ozone layer
D.Goats and grazing animals
Side effect of heavy and constant grazing is that the:
A.Upper layers of soil are loosened and are eroded
B.Lower layers are made more compact and root respiration is interfered with
C.Lower compact layers make root penetration difficult
D.All of the above
Odum has described soil erosion as:
A.Soil pollution
B.Creeping death of soil
C.Loss of living stratum
D.Loss of feeding zone
