2016 - WAEC Agriculture Past Questions and Answers - page 2
11
The most limiting factor affecting land availability for agriculture in urban settlements is
A
soil type
B
topography
C
climate
D
population pressure
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12
Rhizobium supplies nitrogen to leguminous plants by
A
incorporating urea into their bodies
B
fixing atmospheric nitrogen into the soil
C
decomposing plant and animals remains
D
decreasing the pH value of the soil
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13
An example of igneous rock is
A
granite
B
limestone
C
coal
D
sandstone
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14
In chemical weathering of rocks, the equation Fe,2O3+3H2O → Fe2O33H2O represents
A
carbonation
B
hydration
C
solution
D
oxidation
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15
Which of the following statement is a disadvantages of decaying organic matter in soils?
A
Bacterals and fungal growth is enhanced
B
minerals in organic matter are released into the soil
C
physical condition of soil is enhanced
D
water-holding capacity of soil is improved
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16
Lost soil nutrients can be replenished by the following methods except
A
organic manuring
B
fertilizer application
C
continuous grazing
D
cover cropping
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17
In the carbon cycle, carbon dioxide in the air may be replenished by
A
respiration
B
transpiration
C
lighting
D
denitrification
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18
Irrigation can be described as the
A
reduction of soil water
B
spraying of minerals on plants
C
application of dissolved fertilizers to the soil
D
application of water to the soil
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19
Which of the following conditions is a characteristic of a poorly drained soil?
A
presence of a large number of termites
B
Presence of high amount of humus
C
Decrease in the activities of micro organisms
D
High soil fertility and productivity
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20
The process of removing excess maize seedlings from a stand is known as
A
pruning
B
supplying
C
thinning
D
wedding
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