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AGE721S - AGROECOLOGY - 2ND OPP - JAN 2023 |
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nAmlBtA untVERSITY
OF SCIEnCE Ano TECHnOLOGY
FACULTYOF HEALTH,APPLIEDSCIENCEAND NATURALRESOURCES
DEPARTMENT OF AGRICULTUREAND NATURALRESOURCESSCIENCES
QUALIFICATION: Bachelor of Science in Agriculture
QUALIFICATION CODE: 07BAGA
LEVEL:NQF Level 7
COURSE:Agroecology
COURSECODE:AGE721S
DATE:January 2023
DURATION: 3 Hours
MARKS: 100
SECONDOPPORTUNITY/SUPPLEMENTARYEXAMINATION QUESTION PAPER
EXAMINER(S): I Mr C. L. Akashambatwa
MODERATOR: I Mrs. A. Lilungwe
THIS QUESTION PAPERCONSISTSOF 5 PAGES
(INCCLUDING THIS FRONT PAGE)
INSTRUCTIONS
1. Answer ALL the questions.
2. Write clearly and neatly.
3. Number the answers clearly.
PERMISSIBLEMATERIALS
1. Examination paper.
2. Examination script.
3. Calculator
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Question 1
1.1. Draw a table with two columns and nine rows and write down the column headings in
the first row as in Table 1. Then rearrange the order of the main types of feeder appearing
in the second column, correspond with the species best described by that main type of
feeder.
[8]
Table 1
Species
Barn owl
.,, ,, Main type of feeder
..
,,., J' '
'
Plankton feeder
Elephant
Grazer
Elephant shrew
Browser
Hippo
Granivore
Lesser flamingo
Frugivore
Mousebird
Insectivore
Quelia bird
Predatory carnivore
White backed vulture
Scavenger
1.2. Discuss the impacts of genetically modified (GM) crops on agriculture.
[10]
1.3. Explain the impact of dependency on poison to control ticks has on tick's population
today?
[SJ
1.4. Explain what ecological support service is and how human beings benefit from it. [4]
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1.5. Suggest appropriate indicators for each of the environmental problems shown in the
following table, by filling in the relevant cells in reference to the Pressure State Response
framework
[15]
"Enviro(lmental,·Problem -
~:10 ,, h
,. ,Type ,,
' inqicator
,
, ,;,
Pressure
.
of lndJcator,,
<
'
,,,,
,
,:,
,.
;,
'\\f; _,'
Outbreak of locusts
State
Response
Pressure
Wind erosion
State
Response
Bush encroachment
Soil salinization
Decrease in wild animals
Pressure
State
Response
Pressure
State
Response
Pressure
State
Response
1.6. Various human activities in pursuance of food and daily livelihood activities have
negative impact on earth. One of the activities is agriculture. Explain the statement
[6]
1.7. Explain the factors influencing environmental sustainability
[4]
1.8. What is the importance of wildlife management, in terms of wildlife monitoring
[4]
(56)
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Question 2
2.1. Suppose that a communal conservancy has a quota of 200 springbok of which 25% are
expected to be of trophy quality. A trophy springbok can be sold to professional hunters for
N$1500 and the hunters will then allow the community to get the meat and skin. A
springbok usually provides 25 kg of meat. If the community members were to buy beef they
would have to pay N$20 per kg. A springbok skin is valued at N$100. Any springbok on
quota can either be sold to biltong hunters, who keep the meat and skin, for N$1300, or to
sport hunters, who give the meat and skin to the community, for N$600. A capture
company is willing to capture a minimum of 40 live springbok. However, as they face the
cost of transferring their helicopter to the area, regardless of the number of springbok
captured, they offer a value on a sliding scale which depends on the number of springbok
they get offered as indicated in Table 1 below:
Number of springbok
Price offered per springbok
40- 80
N$ 1000
81- 120
N$ 1200
121- 160
N$ 1400
161- 200
N$ 1600
2.1.1. Now Show the most financially efficient use which the community could make out of
the 200 springboks.
[10]
2.1.2. If the community decides to use 50 of the non-trophy springboks for their own
hunting, what will be the opportunity cost which the community would be losing?
[4]
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2.2. The figure below shows the population control by food supply, explain what is
happening to the amount of grass and numbers of oryx at every stage A to E.
[10]
Amount
B
of grass
Amount
(Of grass,
upper line,
and of oryx,
lrnMi:>r lini:> \\
D
E
Numbers
of oryx
Years
2.3. A farmer asks for your advice on whether to grow grapes or dates under irrigation, to
optimize use of limited irrigation water. You have experienced that farmers who grow
grapes usually get a yield of 8 tons/ha and apply the equivalent of 1200 mm of water, while
farmers who grow dates usually get a yield of 6 tons/ha and apply the equivalent of 480 mm
of water. Suppose further that the farm gate price a farmer can get for grapes is N$15/kg
and for dates is N$40/kg.
[12]
2.3.1. Calculate the water use efficiencies of each crop, in terms of litres of water applied
per kg of crop produced
(4)
2.3.2. Calculate the water use efficiencies of each crop in terms of litres of water applied per
N$ gross income.
(4)
2.3.3. Calculate by how much the one fruit is more economically efficient in its use of water
than the other fruit.
(4)
2.4. Name Namibia's terrestrial animals that are regarded as endangered species, give a
brief reason you think some of those animals are endangered.
[8]
[44]
TOTAL MARKS [100]