Ë1412-E-AGS-JE02· ´ Î
JUNE EXAMINATION 2014
AGRICULTURAL SCIENCE 2/2
%
GRADE 12
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Send to : Impak Onderwysdiens (Pty) Ltd
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June examination
G12 ~ Agricultural Sciences
AGRICULTURAL SCIENCES
PAPER 2/2
GRADE 12
JUNE EXAMINATION 2014
EXAMINER: J. Zandberg
MODERATOR: D. Zandberg
TOTAL: 200
TIME: 2½ hours
INSTRUCTIONS AND INFORMATION:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
This question paper consists of FOUR questions. Answer ALL the questions.
SECTION A (QUESTION 1) must be answered on the attached ANSWER SHEET.
Place the ANSWER SHEET for SECTION A (QUESTION 1) in front of the
ANSWER SET.
SECTION B (QUESTIONS 2 – 4) must be answered on FOLIO PAPER.
Start each question in SECTION B on a NEW page.
Read ALL the questions carefully and answer ONLY what is asked.
Number the answers correctly according to the numbering system used in this
question paper.
Non-programmable calculators may be used.
All calculations must be rounded off to TWO decimals, unless otherwise indicated.
Write neatly and legibly.
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June examination
G12 ~ Agricultural Sciences
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June examination
G12 ~ Agricultural Sciences
SECTION A
QUESTION 1
1.1
Various options are provided as possible answers to the following
questions. Choose the correct answer and make a cross (X) in the block (A –
D) next to the question number (1.1.1 – 1.1.10) on the attached ANSWER
SHEET. NO marks will be allocated if more than one cross (X) is made next
to a question.
Example:
1.1.12
A
B
C
D
1.1.1
Viruses are transmitted from one animal to another either through contact between
a healthy animal and a sick animal or insects that live as a … and carry the viral
disease from one animal to another.
A
bacteria
B
parasite
C
saprophyte
D
protozoa
1.1.2
The majority of viral diseases are deadly especially a virus such as ….. because
there is no cure for this disease.
A
foot-and-mouth disease
B
lumpy skin disease
C
blue tongue
D
rabies
1.1.3
South Africa is one of the largest wool-producing countries in the world. Between
2% and ....% of sheep wool is annually affected by blowfly attacks, and this leads
to a decrease in quality and loss of wool.
A
3
B
4
C
5
D
6
1.1.4
When an egg and sperm cell merge, the new cell has … chromosomes – the
same number that all the other kinds of cells in the human body has.
A
46
B
23
C
64
D
32
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June examination
G12 ~ Agricultural Sciences
1.1.5
… is where two hereditary factors are found on two different chromosomes during
cross-pollination.
A
Monohybridism
B
Dihybridism
C
Dominance
D
Segregation
1.1.6
The Dorper sheep breed was developed from the breeding of the Blackhead
Persian and the Dorset Horn breeds. This is an example of a/an ... breeding
system.
A
species-crossing
B
upgrading
C
cross
D
line
1.1.7
Through …, the desired characteristic of a certain breed can be obtained or
increased.
A
species crossing
B
upgrading
C
selection
D
heterosis
1.1.8
… is the phenomenon where one chromatid of each homologous pair of
chromosomes breaks off in corresponding places.
A
Crossover in chromosomes
B
Prepotency
C
Atavism
D
Mutation
1.1.9
Dihybrid is one of those hereditary cases where a ratio of … in the
F2-generation is produced.
A
6:3:3:1
B
9:3:3:1
C
9:3:1:3
D
9:1:3:3
1.1.10 The XY-pair of chromosomes play an important role in ...
A
the female characteristics.
B
variations.
C
mutations.
D
the male characteristics.
(10 x 2) = (20)
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June examination
G12 ~ Agricultural Sciences
1.2
1.2.1
1.2.2
1.2.3
1.2.4
1.2.5
1.3
Choose a description from COLUMN A that matches a concept/phrase in
COLUMN B. Only write the letter (A – J) next to the question number
(1.2.1 – 1.2.5) on the attached ANSWER SHEET, for example 1.2.6 N.
COLUMN A
It is a disease which has a long
duration before the animal dies.
Responsible for large-scale mortality
among chickens and ostriches.
Bacteria living on the remains of
plants and animals.
The study of the mechanism of inheritance
of characteristics from generation to
generation as well as the variations in the
process of inheritance.
This molecule has the ability to reproduce
itself and then forms the basis on which
genetic information is transmitted from cell
to cell.
A.
COLUMN B
Saprophytes
B.
DNA
C.
Chronic disease
D.
Genetics
E.
Parasites
F.
Epidemic
G.
Chromosomes
H.
RNA
I.
Gametes
J.
Newcastle disease
(5 x 2) = (10)
Give ONE word/term/phrase for each of the following descriptions. ONLY
write the correct word/term/phrase next to the question number (1.3.1 –
1.3.5) on the attached ANSWER SHEET.
1.3.1 The phenomenon where a characteristic that was supposed to be
completely absent, suddenly appears.
1.3.2 It is the type of selection where a person selects certain plants and
animals which have the ideal, desired characteristics.
1.3.3 Is caused by a blood parasite called Babesia Bigemina, which is
transmitted by blue ticks.
1.3.4 This is the inflammation of the udder and is caused by bacteria known as
the streptococcus bacteria.
1.3.5 It occurs from time to time because many combinations happen during
fertilisation.
(5 x 2) = (10)
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June examination
G12 ~ Agricultural Sciences
1.4
Fill in the missing word. Write the correct answer next to the question
number.
1.4.1 The turning around of a part of a chromosome is called …
1.4.2 One of the best known viral diseases that caused South Africa a lot of
harm is...
1.4.3 … is the ability of certain animals to pass their particular characteristics to
their offspring.
1.4.4 The normal temperature of cattle is …
1.4.5 When a characteristic is revealed on the gender chromosome, it is …
(5 x 1) = (5)
TOTAL SECTION A: 45
SECTION B
QUESTION 2: ANIMAL HEALTH
Start this question on a NEW page.
2.1
Study the picture below:
2.1.1
2.1.2
2.2
Identify the apparatus on the photo.
Explain how to use this apparatus when treating a sick animal.
Complete the following table and indicate THREE clear differences between
chronic and acute mastitis.
Chronic mastitis
Acute mastitis
2.2.1
2.2.4
2.2.2
2.2.5
2.2.3
2.2.6
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(2)
(5)
(6)
June examination
G12 ~ Agricultural Sciences
2.3
A parasite is an animal, insect or plant that lives on another living organism by
extracting nutrients from it. The organism on which the parasite lives, is called
the host. Parasites sometimes secrete toxins that can harm the host.
2.3.1
2.3.2
2.3.3
2.3.4
2.4
2.5
Give a description to prove that flukes are an internal parasite.
Identify TWO non-ruminants that are affected by flukes.
Describe the symptoms of the disease liver fluke in sheep.
Identify TWO areas on a farm where animals can be infected by
parasites.
(2)
(2)
(2)
(2)
Ticks are some of the external parasites which can cause serious damage in
animals.
2.4.1 Identify FOUR detrimental effects of ticks on animals.
2.4.2 Discuss the general control of external parasites.
(4)
(5)
Label the sketch on the lifecycle of the blue tick.
(5)
2.5.1
2.5.2
2.5.3
2.5.4
2.5.5
[35]
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June examination
G12 ~ Agricultural Sciences
QUESTION 3: AGRICULTURAL MANAGEMENT (DISEASE CONTROL)
Start this question on a NEW page.
3.1
Poisoning is often a complex problem and should be examined by a
veterinarian. When animals are sick, a veterinarian should be consulted as
there often is no specific antidote and animals should be treated according to a
specific symptom of a disease.
3.1.1
3.1.2
3.2
Discuss the general principles to be applied in the treatment of
poisoning.
Where does the intake of poisonous plants most often take place?
Plant toxins usually affect a specific organ OR cause damage to body
systems.
Name any five factors which promote the existence of plant poisoning.
3.3
(6)
(3)
(5)
Study the following photo:
3.3.1
3.3.2
3.3.3
3.3.4
Identify the disease in the photo.
(2)
Name the symptoms that occur in animals after they have eaten some of
the above contaminated feed.
(2)
Which condition develops in horses and cattle, if they eat from this
contaminated feed?
(2)
Under which favourable conditions does this disease grow and develop?(2)
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June examination
G12 ~ Agricultural Sciences
3.4
THE ROLE OF THE STATE IN ANIMAL PROTECTION
Veterinary services set by the state aid the farmer to help prevent direct and
production losses as well as minimise losses. Each farmer is directly and
personally responsible for the health of his animals through proper nutrition
and sufficient water. The farmer is also responsible for controlling diseases
through vaccination and other preventative measures.
3.4.1
3.4.2
3.4.3
Explain the procedure that a farmer must follow when there is an outbreak
of a disease among animals on his farm.
(5)
The state is managing the spread of specific diseases in different animals.
Name THREE diseases controlled by the state and identify one specific
animal for each disease.
(6)
What is the function of the state in relation to animal diseases?
(2)
[35]
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June examination
G12 ~ Agricultural Sciences
QUESTION 4: BASIC AGRICULTURAL GENETICS
Start this question on a NEW page.
4.1
Study Mendel’s principle of dominance.
When a gene dominates a second one completely, where both are present, that
gene is described as dominant and the second gene as recessive.
4.1.1
Complete the diagram below to prove that pure tall plants (DD) are dominant over
pure short plants (dd).
Parents
DD (tall)
D
Gametes
3.
x
dd(short)
2.
1.
d
4.
5.
6.
F1-generation
4.1.2
(6)
Complete the F2-generation as well and indicate the ratio of tall to short plants.
Dd
X
D
F2-generation
X
1.
d
Dd
X
2.
D
3.
X
d
4.
2
1
5.
6.
(6)
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June examination
G12 ~ Agricultural Sciences
4.2
4.3
Give a clear explanation of a “crossover” in chromosomes.
(5)
Selection: Plants and animals are selected to obtain the desired
characteristics, such as higher production specimens with larger seeds or
higher milk production. Whatever the desired characteristics may be, plants
and animals can be selected to produce a generation with these
characteristics.
4.3.1
4.3.2
4.3.3
In which TWO ways can selection take place?
On what is the selection of quantitative characteristics based?
Explain why family data is an important basis of selection.
(2)
(4)
(5)
4.4 Study the following diagram on line breeding:
Assume ram nr. 5 is an outstanding ram:
5
1
Ewe
F
6
ewe
X
5
2
Ewe
Ewe
M
7
5
ram
3
8
Ewe
5
4
9
Identify the four lines of relationship between 5 and X.
4.5
(4)
Explain the purpose for which cross-breeding is used and give ONE
example.
(3)
[35]
TOTAL SECTION B: 105
GRAND TOTAL: 150
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June examination
G12 ~ Agricultural Sciences
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June examination answer sheet
G12 ~ Agricultural Sciences
AGRICULTURAL SCIENCES
PAPER 2/2: ANSWER SHEET
SECTION A
45
NAME: _______________________________________________
ID NUMBER:
QUESTION 1.1
1.1.1
A
QUESTION 1.3
B
C
D
1.1.2
A
B
C
D
1.3.1 ___________________________
1.1.3
A
B
C
D
1.3.2 ___________________________
1.1.4
A
B
C
D
1.1.5
A
B
C
D
1.1.6
A
B
C
D
1.1.7
A
B
C
D
1.1.8
A
B
C
D
1.1.9
A
B
C
D
1.1.10
A
B
C
D
1.3.3 ___________________________
1.3.4 ___________________________
1.3.5 ___________________________
(5 x 2) = (10)
(10 x 2) = (20)
QUESTION 1.2
1.2.1
QUESTION 1.4
1.4.1 ___________________________
1.2.2
1.4.2 ___________________________
1.2.3
1.2.4
1.4.3 ___________________________
1.2.5
1.4.4 ___________________________
(5 x 2) = (10)
1.4.5 ___________________________
(5 x 1) = (5)
TOTAL SECTION A: 45
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