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Agricultural Science
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71
Which of the following is not an effect of burning on the soil?
A.
increasing the organic matter in the soil
B.
increasing the soil nutrients
C.
increasing the acidity of the soil
D.
exposing the soil to erosion
E.
sterilization of the soil
View Answer & Discuss
WAEC 1989
72
The function of soil micro-organisms include the following except
A.
decomposition of dead plant and animal remains
B.
recycling of nutrients
C.
causing plant or animal diesases
D.
living as parasites on crop plants
E.
filtration of soil water for plant use
View Answer & Discuss
WAEC 1989
73
Slate is derived from
A.
schist
B.
sandstone
C.
shale
D.
gneiss
E.
quartzite
View Answer & Discuss
WAEC 1989
74
The following are advantages of the sprinkler method of irrigation except
A.
rate of application of irrigation water can be controlled
B.
portable nature of many sprinkler system make them suitable for use
C.
the sprinkler system can be made automatic
D.
method can be where topography affects horrowing of land
E.
method may be difficult for local farmers to use
View Answer & Discuss
WAEC 1989
75
Rhizobium supplies nitrogen to leguminous plants by
A.
changing some mineral salts to sulphate of ammonia
B.
incoporating urea into its body
C.
fixing atmospheric nitrogen
D.
decomposing plant remains
E.
increasing the PH value of the soil
View Answer & Discuss
WAEC 1989
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