NAMIBIA SENIOR SECONDARY CERTIFICATE
AGRICULTURE ORDINARY LEVEL
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PAPER 1 Multiple Choice
1 hour
Marks 40
2013
Additional Materials: Multiple choice answer sheet
Soft clean eraser
Soft pencil (type B or HB is recommended)
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INSTRUCTIONS AND INFORMATION TO CANDIDATES
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Make sure that you receive the multiple choice answer sheet with your Candidate Number on it.
Write in soft pencil.
Answer all questions.
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There are forty questions on this paper.
For each question, there are four possible answers A, B, C and D. Choose the one you consider
correct and record your choice in soft pencil on the separate multiple choice answer sheet.
If you want to change an answer, thoroughly erase the one you wish to delete.
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Read the instructions on the answer sheet carefully.
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Each correct answer will score one mark. A mark will not be deducted for a wrong answer.
Any rough working should be done in this booklet.
All questions in this paper carry equal marks.
You may use a non-programmable calculator.
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This document consists of 9 printed pages and 3 blank pages.
Republic of Namibia
MINISTRY OF EDUCATION
© MoE/DNEA
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1
Which livestock kept by farmers in Namibia earns the most money for Namibia when
exported?
A cattle
B donkeys
C goats
D poultry
2
Which agricultural activity has the greatest effect on the water cycle?
A burning crop residues
B cutting down trees
C ploughing down slopes
D use of chemicals
3
What requirements must be met before seeds will germinate?
A warmth, air, light
B cold, light, water
C warmth, air, water
D cold, air, water
4
Which part of a leaf of a crop plant would reduce excessive evaporation at all times?
A chloroplast
B cuticle
C palisade layer
D stomata
5
Which land tenure system in Namibia is based on ownership of the land and title deeds?
A communal
B freehold
C leasehold
D resettlement
6
HIV and AIDS have a negative impact on the Agricultural sector.
What do HIV and AIDS represent?
A
B
C
D
bacteria and disease
diseases caused by bacteria
diseases caused by fungi
virus and disease
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7
Why is rain water an effective weathering agent of rocks?
A It increases surface temperature of rocks fast.
B It dissolves carbon dioxide to form carbonic acid.
C It can cause much soil erosion.
D Some rocks are broken by falling rain.
8
Which soil horizon from the diagram is made up of partially weathered rocks?
horizon W
horizon X
horizon Y
horizon Z
A
B
C
D
9
horizon W
horizon X
horizon Y
horizon Z
The diagram illustrates the nitrogen cycle.
nitrogen in air
nitrates
plant protein
nitrites
animal protein
ammonium
compound
How are nitrites changed to nitrates?
A
B
C
D
action of nitrogen fixing bacteria
absorption by plants
action of nitrifying bacteria
death and decay of plants and animals
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10 Which process helps to improve soil structure on arable land?
A application of inorganic matter
B application of organic matter
C burning of crop remains
D irrigation of crops
11 The diagram shows the composition of a soil.
25%
water
45%
mineral matter
25%
air
5%
organic matter
Which soil component will be made to decrease by an increase of water in the soil?
A
B
C
D
air
mineral matter
organic matter
soil living organisms
12 Why does clay soil have a higher water-holding capacity than sandy soil?
A It has low organic matter content.
B It has small soil particles that are well spaced.
C Its particles have a large total surface area.
D Its particles have a small total surface area.
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13 The farm structure below is a maize crib with a labelled part X on one of its standing
poles.
X
What is the role of the part labelled X?
A
B
C
D
prevent rats from climbing up into the maize crib
prevent the moisture from attacking maize cobs
prevent the poles from rotting
prevent water drops from eroding the ground around the poles
14 Which factor would make any given soil more susceptible to erosion?
A low soil organic content
B low soil moisture
C low soil pH
D low soil temperature
15 What do we call the grouping or arrangement of soil particles?
A soil drainage
B soil profile
C soil structure
D soil texture
16 Which two nutrients are essential in the formation of chlorophyll in plants?
A magnesium and calcium
B magnesium and nitrogen
C potassium and nitrogen
D potassium and phosphorus
17 What is the correct order to describe soil particles in order of size from small to large?
A clay, silt, sand, gravel
B gravel, sand, clay, silt
C gravel, sand, silt, clay
D silt, clay, gravel, sand
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18 Which of the following is an example of active transport in plants?
A absorption of mineral salts
B absorption of water up the xylem vessels in the vascular bundles of the root
C removal of excess water
D osmotic uptake of water into the root
19 The recommended seed rate for a cereal crop is 150 kg per hectare. Calculate the
mass of seeds required for a field measuring 8 000 m2.
A 30 kg
B 60 kg
C 120 kg
D 1 200 kg
20 Which of the following pests is a vector of viral diseases of crops?
A aphids
B bollworms
C cutworms
D stalk borer
The diagram shows a common pest that feeds on plants.
Use the diagram to answer questions 21 and 22.
21 Which pest is shown in the diagram?
A aphid
B leaf minor
C locust
D stalk borer
22 Describe how the pest in the diagram feeds.
A biting and chewing
B boring and biting
C piercing and sucking
D sucking and biting
23 Which of the following pair are cultural methods of weed control?
A crop rotation and early planting
B cultivation and mulching
C flooding and spraying chemicals
D mulching and ploughing
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24 In what form do cereal seeds mainly store food?
A amino acids
B carbohydrates
C proteins
D starch
25 The diagram shows the reproductive system of a bull.
seminal vesicle
prostate gland
bladder
Cowpers gland
vas deferens
urethra
penis
epididymis
testis
scrotum
sheath
In which part of the system are sperms produced?
A
B
C
D
epididymis
penis
testis
scrotum
26 Which is the correct movement of food in the ruminant digestive system?
A mouth → reticulum → omasum → rumen → abomasum
B mouth → rumen → reticulum → omasum → abomasum
C rumen → mouth → reticulum → omasum → abomasum
D rumen → reticulum → mouth → omasum → abomasum
27 What is one of the functions of the cervix in the female reproductive system of a cow?
A to allow sperms to enter the uterus after mating
B to prevent entry of disease-causing organisms
C to provide food for the growing embryo
D to secrete hormones necessary for conception
28 What is the main function of proteins in an animal’s body?
A to help in the absorption of vitamins from feed
B to provide warmth and energy
C to repair worn out tissues and for growth
D to strengthen bones and teeth
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29 How can external parasites in livestock be controlled?
A dipping
B dosing
C immunization
D vaccinating
30 The table shows diseases that have been matched to disease-causing organisms.
Which is the correct match?
A
B
C
D
causal organism
bacteria
protozoa
ticks
virus
disease
foot-and-mouth
anthrax
coccidiosis
Newcastle
31 In sheep the allele for long wool is dominant to the allele for short wool.
Which mating would result in a ratio of 3:1?
A
B
C
D
a heterozygous ewe and a ram with short wool
a homozygous ewe and a heterozygous ram
both parents were heterozygous for wool length
both parents were homozygous for wool length
32 How can the spread of infectious diseases in livestock be prevented?
A dosing
B disinfection
C dipping
D vaccination
33 The function of droppers in a fence is to
A keep the fence in shape.
B strengthen the standard posts.
C support corner posts.
D support the wire strainer.
34 Which farm tool is used to tie wire during fencing?
A hammer
B pliers
C saw
D screw driver
35 Iron fencing posts need treatment. How does the treatment protect it?
A against animals
B against rotting
C against rusting
D against termites
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36 Why are dam structures wider at the base than at the top?
A to allow the dam to collect more water
B to allow water in the dam to settle
C to avoid soil erosion from eroding the wall
D to resist water pressure which increases with depth
37 Which of the following pair are variable costs?
A fertilizers and permanent labour
B interest on loan and depreciation
C pesticides and equipment lease costs
D seeds and fertilizers
38 Why are farm records important to the farmers?
A show the profitability of the farm
B show the community that they are best farmers
C show the community what they produce on their farms
D show information on how they are going to spend their money
39 What is the best advice you could give to a newly resettled farmer to guard against risk?
A Insuring the enterprise.
B Practice mixed farming.
C Reduce of input cost.
D Select a more productive enterprise.
40 The graph illustrate the Law of Diminishing Returns.
C
D
B
total output from a
fixed area of land
A
variation in labour
Which point on the curve marks the start of the stage of diminishing returns?
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