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AGRICULTURAL SCIENCES PAPER 1 GRADE 12 MEMORANDUM - 2018 SEPTEMBER PREPARATORY EXAM PAPERS AND MEMOS

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AGRICULTURAL SCIENCES PAPER 1
GRADE 12
NATIONAL SENIOR CERTIFICATE
MEMORANDUM
SEPTEMBER 2018

SECTION A
QUESTION 1
1.1
1.1.1 C √√
1.1.2 B √√
1.1.3 D √√
1.1.4 B √√
1.1.5 B √√
1.1.6 D √√
1.1.7 A √√
1.1.8 C √√
1.1.9 A √√
1.1.10 A √√
(10 x 2) (20)
1.2
1.2.1 Both A and B √√
1.2.2 B only √√
1.2.3 A only √√
1.2.4 None √√
1.2.5 B only √√
(5 x 2) (10)
1.3
1.3.1 Nitrogen-free extract √√
1.3.2 Quarantine √√
1.3.3 Chin ball marker √√
1.3.4 Pregnancy/gestation √√
1.3.5 Freemartin √√
(5 x 2) (10)
1.4
1.4.1 Ideal protein/egg protein √
1.4.2 Battery √
1.4.3 Urethra √
1.4.4 Flushing/harvesting √
1.4.5A nterior √
(5 x 1) (5)
TOTAL SECTION A: 45

SECTION B
QUESTION 2: ANIMAL NUTRITION
2.1
2.1.1 Animal with stomach compartments
Fowl/chicken/poultry/birds √ (1)
2.1.2 TWO reasons visible to justify the answer

  • 2 caecum/ceaca √
  • Presence of a gizzard/ventriculus /proventriculus √
  • Presence of crop (Any 2 x 1) (2)

2.1.3 Identification of the letter

  1. C √ (1)
  2. E √ (1)
  3. D √ (1)

2.1.4 TWO adaptation features of part D

  • Presence of small stones √
  • Thick wall muscle / very tough wall √ (2)

2.1.5 Indication of type of feed suitable for fowls
Concentrates √ (1)
2.2 Nutritional information of different feeds
2.2.1 Classification of feeds

  1. Protein-rich roughage √
  2. Protein-rich concentrate √
  3. Carbohydrate-rich concentrate √
  4. Carbohydrate-rich roughage √ (4)

2.2.2 Pearson square
Feed C 9 /maize √ meal
1
Feed B 38/ Soya\bean oil-cake meal 

Feedlot ration of feed C : B is 21 : 8 √ (4)
2.2.3 Calculation of percentage of feed B
21 + 8 = 29 √
 8  x 100 √
29 
= 27,59/28% √ (3)
2.3 Feed energy flow
2.3.1 Indication of the letter representing types of energy

  1. C √ (1)
  2. B √ (1)

2.3.2 Calculation of energy in A (digestible energy)
Gross energy – energy in faeces
18,5 MJ/kg – 7,32 MJ/kg √
= 11,18 MJ/kg √ (2)
2.4 Supplements
2.4.1

  1. Tranquilisers
    They calm animals making them to eat more √ (1)
  2. Antibiotics
    Prevent animals from getting diseases √ (1)
  3. Somatotropin hormone
    Hormones increase the rate at which feed is converted to muscles √ (1)

2.5 Feed flow programme
2.5.1 Calculation of the total dry matter in tons
3 200 kg/ha x 40 ha = 128 000 kg √
= 128 000 kg
      1 000 √
= 128 tons √ (3)
2.5.2 Determination of the total requirement by all animals for 120 days
Total requirement by calves = 200 x 120 = 24 000 kg 1 000 √ = 24 tons √
Total required by all animals = 24 + 72 + 5,4 = 101,4 tons √ (3)
2.5.3 Suggestion of the season
Summer/rainy season √
Reason
= There is an excess of 26,6 tons (128 – 101,4 = 26,6) √ (2)
[35]

QUESTION 3: ANIMAL PRODUCTION, PROTECTION AND CONTROL
3.1 Production levels of pigs in different conditions
3.1.1 Identification of pigs

  1. Pig C √ (1)
  2. Pig A √ (1)
  3. Pig B √ (1)

3.1.2 Reason for 3.1.1 (c)
There is a high increase of final mass from initial mass of 40 kg to
70 kg / increase in mass by 30 kg as compared to other pigs. √ (1)
3.1.3 THREE factors that have contributed to highest improved production in pig B.

  • Nutrition/feeding √
  • Environment √
  • Breeding/reproduction √
  • Management √ (Any 3 x 1) (3)

3.2 Facilities in an intensive production system
3.2.1 Identification of the facility
C Holding pen √
D Feeding shed √ (2)
3.2.2 Indication of the purpose for using facilities A and B

  1. – It is used for loading √
  2. – For guiding animals towards a loading truck √ (2)

3.3 Handling guidelines
3.3.1 Indication of animal to which the handling guideline applies

  1. Poultry/chicken √
  2. Sheep √
  3. Pig √ (3)

3.4 THREE abnormal behaviour displayed by pigs when stressed

  • Belly nibbling √
  • Snout rubbing √
  • Cannibalism √
  • Ear biting √
  • Tail biting √ (Any 3 x 1) (3)

3.5 Life cycle of a parasite
3.5.1 Classification of the parasite based on the life cycle

  • One-host tick√

Name

  • Blue tick √ (2)

3.5.2 Reason for classification
It remains on one host during larva and nymph stages/Completes its life cycle on only one host √ (1)
3.5.3 Protozoan disease transmitted by parasite
Redwater √ (1)
3.5.4 TWO veld management practices to prevent parasite infestation

  • Veld must be rested/rotational grazing/zero grazing √
  • Practice good hygiene √
  • Expose animals to ticks to build immunity √
  • Breed resistant animals √ (Any 2 x 1) (2)

3.6 Swine fever
3.6.1 Pathogen causing swine fever and animal affected
Virus √ (1)
Animal Pig √ (1)
3.6.2 TWO reasons for classifying swine fever as epidemic

  • It affects a large number of animals √
  • It spreads rapidly √
  • Can affect humans √ (Any 2 x 1) (2)

3.6.3 Term meaning the disease transmitted from animals to human beings
Zoonotic √ (1)
3.6.4 Identification of the state role in preventing further spread of the disease
Animals are killed and their products are destroyed √ (1)
3.6.5 Duty of owners of animals in controlling swine fever once detected
Reporting the outbreak of the disease to relevant authorities √ (1)
3.7 Sustainable use of medication
3.7.1 TWO methods to test animal health

  • Taking animal’s temperature √
  • Determining pulse rate √
  • Determining respiratory rate √ (Any 2 x 1) (2)

3.7.2 THREE precautions to be taken before treating animals to ensure sustainable use of medication

  • Ensure that medicine is safe to use for the specific animal √
  • Check the expiry date √
  • Administer correct dosage according to weight and age of an animal √
  • Correct method of administering the medicine must be followed √
  • Animal products like meat and milk must not be used before the withdrawal period of the medicine √
  • Medicine must be kept away from children √ (Any 3 x 1) (3)

[35]

QUESTION 4: ANIMAL REPRODUCTION
4.1 Reproductive system of a bull
4.1.1 Identification of the letter

  1. H √ (1)
  2. F √ (1)
  3. D √ (1)
  4. G √ (1)

4.1.2 Explanation of how scrotum regulates temperature under extreme temperature conditions
When it is cold the scrotum draws the testes closer to the body √ and when it is hot it moves them away from the body. √ (2)
4.2 Graph
4.2.1 Graph on levels of progesterone and oestrogen
2
Criteria/rubric/marking guideline

  • Correct heading √
  • X-axis: Correctly labelled and calibrated (Time/days) √
  • Y-axis: Correctly labelled and calibrated (Levels of progesterone and oestrogen) √
  • Line graph √
  • Accuracy √
  • Correct units mlU/mℓ √ (6)

4.2.2 Identification of the day when cow was in oestrus
Day 12 √ (1)
4.2.3 Reason
Oestrogen is at its highest level √ (1)
4.2.4 Stage of oestrus on day 28
Di-oestrus √ (1)
Reason

  • Progesterone is at its peak √
  • Level of oestrogen is low √ (Any 1 x 1) (1)

4.3 Synchronisation
4.3.1 Term referring to the process
Synchronisation of oestrus √ (1)
4.3.2 TWO techniques of synchronising oestrus

  • Inject prostagladin √
  • Inject/ear implanting progesterone √
  • MGA and PG given in a feed √
  • Controlled internal drug release (CIDR) √
  • Gonadotrophin-releasing hormone (GnRH) (Any 2 x 1) (2)

4.3.3 TWO disadvantages of synchronisation

  • Labour intensive √
  • It is expensive √
  • High level of management is needed √
  • Need good handling facilities √
  • Pregnancy testing needs to be done regularly √ (Any 2 x 1) (2)

4.4 Reproductive process in cows
4.4.1 Identification of the process
Artificial insemination √ (1)
4.4.2 TWO requirements of AI that are visible

  • Correct technique √
  • Trained personnel √ (2)

4.4.3 TWO economic benefits of artificial insemination for the farmer

  • It is a quick and economical way to improve the herd/no need to buy a bull √
  • Semen of one bull can inseminate many cows √ (2)

4.5 Indication of the stage of pregnancy

  1. Embryonic stage √ (1)
  2. Foetal stage √ (1)
  3. Ovum stages √ (1)

4.6 Graph on milk production, dry matter intake and body weight
4.6.1 Indication of the time in weeks

  1. Peak milk production: Week 6/7/8/9 √(1 )
  2. Drying up of a cow: Week 42 √ (1)

4.6.2 TWO reasons for the importance of colostrum

  • Has antibodies to increase calf’s resistance to disease √
  • Provides nutrients √
  • Necessary for growth, functioning and maturation of the alimentary canal √ (Any 2 x 1) (2)

4.6.3 Explanation of a relationship between milk production, body weight and dry matter
The more the dry matter intake, the higher the milk production and the lesser the body weight. √√ (2)
[35]
TOTAL SECTION B: 105
GRAND TOTAL: 150

Last modified on Wednesday, 15 September 2021 09:15