S.2 AGRICULTURE HOLIDAY WORK TERM 3 SOIL EROSION.
1.
Soil Erosion can best be defined as. A The washing away of top soil by running water
A. The washing away of top soil by running water
B. The washing away of fertile top soil
C. The removal of top soil by rainwater
D. The removal of fertile top soil by water or wind
2.
Surface run off water can best be described as
A. water that runs on surface after infiltration in the soil
B. Rainwater that comes as a storm
C. large volumes of water that do not infiltrate into the soil but runs on the surface
D. muddy water with organic matter that runs on top of the soil surface.
3.
Large rain drops falling on bare ground usually result in;
A. Gully erosion
B. Rill Erosion
C. Splash erosion
D. Sheet Erosion
4.
Three of the following affect the rate of water erosion, which one does not
A. Flat landscape
B. Loosely arranged soil particles
C. Soil with no vegetation cover
D. Continuous cultivation of land
5.
Running water on a long and steep slope will have high erosive power since;
A. Water is running at a high velocity
B. Water meets no obstacles
C. There is a lot of relief rainfall
D. Water collects into pools.
6.
Soil with a lot of organic matter cannot easily be eroded due to
A. presence of many soil organisms
B. soil particles are arranged loosely with organic matter in between
C. the speed of water and wind is moderate
D. it has a better water infilteration rate.
7.
Clay soils are less prone to erosion since
A. they are common in valley bottoms were erosion does not occur
B. soil particles stick together
C. they are known as heave soils
D. particles are too small to be carried away
8.
Old leaves and stems falling off plants control soil erosion by
A. absorbing the water
B. checking soil transportation
C. increasing the speed of surface
D. binding water particles together
9.
Vegetation roots bind soil particles together allowing
A. greater water infilteration instead of surface run off
B. loosening soil particles so that they can easily be carried away
C. greater intensity of rain drops
D. greater velocity of water and therefore greater erosive power.
10.
One of the following farming practices leaves the soil exposed to erosive agents. Which
one is it?
A. digging across the slope
B. leaving land under pasture for grazing cattle
C. growing crops with upright
D. intercropping
11.
Prolonged dry seasons
A. reduces the rate of soil erosion
B. checks on the rate of wind velocity
C. trap soil particles that may have been erode
D. encourage wind erosion.
12.
The type of soil erosion where rain drops loosen soil particles and disperse them as muddy
water is called.
A. splash erosion
B. sheet erosion
C. rill erosion
D. gulley erosion.
13.
The type of erosion common on gently sloping land with no obstacles is
A. splash erosion
B. sheet erosion
C. rill erosion
D. gulley erosion.
14.
Sheet erosion gets its name from the fact that
A. it creates small depressions where water accumulates
B. it loosen surface soil
C. it remove soil in uniform thin layers
D. it cuts the soil surface into sheets.
15.
Soil pore spaces are easily blocked on a field where there is no vegetation cover by
A. soil particles blown by wind
B. muddy water containing fine soil particles
C. high erosive power
D. direct rain drops.
16.
A number of shallow channels created by over flowing surface run off water are common
where
A. gentle slopes have no surface cover
B. soil is mainly of silty nature
C. heavy storms occur on loose soil
D. loosened soil particles are dispersed.
17.
One characteristic of gulley erosion is that
A. large volumes of water remove large quantities of soil from the filed
B. shallow channels are created all over the filed
C. loose soil is carried away
D. it is most common on gentle slopes
18.
Removal of loose dry soil particle from one place to another I mainly by
A. large rain drops
B. water with strong erosive power
C. surface run off
D. strong wind.
19.
One can notice stream bank erosion has occurred when
A. shallow ditches have been created in the field
B. large depressions carrying large volumes of soil are seen
C. crops at the bottom of the slope are covered with silt
D. the stream has widened
20.
Erosion makes soil less fertile since
A. soil is loosened
B. large volumes of soil are removed
C. tunnels are created in the filed
D. plant nutrients and soil organisms are washed away
21.
It is not easy to cultivate land that has been eroded over time because
A. all vegetation has been washed away
B. the resultant soil is hard
C. all pore spaces have been blocked
D. erosion results in drought.
22.
When the soil profile is destabilised by erosion carrying soil from one place to the other
A. all nutrients are lost
B. plants get stunted
C. sub soil that I less productive is exposed
D. the bedrock may be seen on the surface
23.
Erosion reduces soil productivity by
A. loosening the soil
B. blowing soil away particles
C. depositing infertile soil on fertile soil
D. removing soil in uniform layers
24.
The type of erosion that reduces land that can be sued for framing greatly is
A. splash erosion
B. sheet erosion
C. rill erosion
D. gulley erosion
25.
Erosion pollutes water bodies by
A. carrying chemicals into them
B. carrying silt into them
C. carrying plants into them
D. making the water smell bad.
26.
Erosion water may carry the following except one which one is it?
A. weeds and weed seeds
B. crop pests
C. trees and shrubs
D. water borne diseases
27.
The effect of erosion on crops at the bottom of the slope is that
A. they may be carried away by erosion water
B. they may be uprooted
C. they may break into pieces
D. they may be buried by debris in the erosion water
28.
One of the effects of erosion on channels made in the field for either drainage or irrigation
is that
A. water flows into them
B. they may become less effective due to silting
C. they may get polluted by silting
D. they may become hard
29.
Movements of people , machinery and animals on the farm becomes hard after
A. gulley erosion
B. Rill erosion
C. sheet erosion
D. splash erosion
30.
Erosion increases the cost of producing crops especially as
A. eroded land cannot easily be bought
B. soil can easily be washed away from around crops
C. soil control measured and maintaining farm roads cost money
D. crops from eroded land will be bought more expensively.
Answers to Soil Erosion Agriculture s.2 Term 3, 2013
1
D
11
D
21
B
2
C
12
A
22
C
3
C
13
B
23
C
4
A
14
C
24
D
5
A
15
B
25
A
6
D
16
C
26
C
7
B
17
A
27
D
8
B
18
D
28
B
9
A
19
D
29
A
10 C
20
D
30
C