Agricultural Sciences Grade 12 P1 NSC June 2023 Question Paper

Downloaded from hlayiso.com SENIOR CERTIFICATE EXAMINATIONS/ NATIONAL SENIOR CERTIFICATE EXAMINATIONS AGRICULTURAL SCIENCES P1 2023 MARKING GUIDELINES MARKS: 150 These marking guidelines consist of 11 pages. Copyright reserved Please turn over

Downloaded from hlayiso.com Agricultural Sciences/P1 2 DBE/2023 SC/NSC – Marking Guidelines SECTION A QUESTION 1 1.1 1.1.1 B  1.1.2 A  1.1.3 C  1.1.4 C  1.1.5 D  1.1.6 D  1.1.7 B  1.1.8 D  1.1.9 A  1.1.10 B  (10 x 2) (20) 1.2 1.2.1 B only  1.2.2 Both A and B  1.2.3 A only  1.2.4 B only  1.2.5 None  (5 x 2) (10) 1.3 1.3.1 Regurgitation/retro-peristalsis  1.3.2 Quarantine/isolation  1.3.3 Urethra  1.3.4 Nucleus  1.3.5 Repeat-breeder syndrome  (5 x 2) (10) 1.4 1.4.1 Bolus  1.4.2 Commercial  1.4.3 Scrotum  1.4.4 Mummification  1.4.5 Ejaculation  (5 x 1) (5) TOTAL SECTION A: 45 Copyright reserved Please turn over

Downloaded from hlayiso.com Agricultural Sciences/P1 3 DBE/2023 SC/NSC – Marking Guidelines SECTION B QUESTION 2: ANIMAL NUTRITION 2.1 Digestive system of a farm animal 2.1.1 Name of the farm animal Chicken/fowl/poultry  (1) 2.1.2 TWO reasons visible in the diagram  Presence of a crop   Presence of proventriculus/glandular stomach   Simple stomach/monogastric   Presence of ventriculus/gizzard/muscular stomach   Presence of caeca/two blind guts  (Any 2) (2) 2.1.3 Indication of the pH (a) B - Acidic  (1) (b) E - Alkaline/basic  (1) 2.1.4 TWO importance of the substance/gastric juice in digestion  It is antiseptic and destroys bacteria/prevent rotting of the stomach content   Changes the pH of the stomach from alkaline to acidic   Changes disaccharides into monosaccharide   Activates pepsinogen to form pepsin   Pepsin changes proteins to peptones  (Any 2) (2) 2.1.5 Role played by part labelled C/gizzard It grinds food into smaller particles for easy digestion/mechanical/ physical digestion  (1) 2.2 Sow and its litter in a farrowing pen 2.2.1 Mineral element deficient Iron/Fe  (1) 2.2.2 TWO iron deficiency symptoms  Anaemia   Paleness of mucous membranes   Listlessness/laziness/fatigue/lethargy   Laboured/difficult breathing   Accelerated heartbeat   Loss of appetite   Diarrhoea   Reduced growth  (Any 2) (2) 2.2.3 A method of supplementing iron  Soil sods   Injection   Iron paste/paint/solution  (Any 1) (1) Copyright reserved Please turn over

Downloaded from hlayiso.com Agricultural Sciences/P1 4 DBE/2023 SC/NSC – Marking Guidelines 2.2.4 Feed component for optimum growth of piglets Protein  (1) 2.3 Feed trial 2.3.1 The purpose of the feed trial To determine the digestibility of the hay/amount of oat hay digested and absorbed  (1) 2.3.2 Classification of the feed Roughage  (1) 2.3.3 Calculation of the digestibility co-efficiency DC = Dry material intake (kg) – Dry mass of manure (kg) x 100  Dry material intake (kg) 1 = 8 kg – 4,5 kg x 100  8 kg 1 = 43,75  %  (4) 2.3.4 Naming the substances (a) Molasses  (1) (b) Urea/biuret  (1) 2.4 Nutritive ratio 2.4.1 Calculation (a) % of non-nitrogen substances = 80% – 8%  = 72%  (2) (b) Nutritive ratio NR = 1 : %TDN – %DP  %DP 1 : 80% – 8%  8% 1:9 OR NR = 1 : % digestible non-nitrogen substances  % digestible protein 1 : 72%  8% 1:9  (3) 2.4.2 TWO components making up non-nitrogen content in a feed  Digestible fat/lipids   Digestible carbohydrates   Vitamins   Minerals  (Any 2) (2) Copyright reserved Please turn over

Downloaded from hlayiso.com Agricultural Sciences/P1 5 DBE/2023 SC/NSC – Marking Guidelines 2.5 Feed flow programme 2.5.1 Calculation of the total amount of feed required Feed required = number of animals x feed/animal/day x number of days = 150 animals x 5 kg x 30 days  = 22 500  1 000 = 22,5 tons  (3) 2.5.2 Quantity of cattle feed during month 3 Feed will be enough  (1) 2.5.3 Reason Feed required is 22 500 kg and feed available is 30 000 kg/there is a surplus of 7 500 kg  (1) 2.5.4 The month with the least shortage of feed Month 6  (1) 2.5.5 ONE cost effective strategy to address the shortage of feed  Storage feed during months where there is an excess   Stock reduction/culling   Controlled calving/change the breeding season   Planting of seasonal fodder crops  (Any 1) (1) [35] QUESTION 3 : ANIMAL PRODUCTION, PROTECTION AND CONTROL 3.1 Production output and cost distribution for two feedlots 3.1.1 The feedlot which operates at the highest cost Feedlot 2  (1) 3.1.2 The feedlot which operates in the most cost-efficient way Feedlot 1  (1) 3.1.3 Explanation of the answer in QUESTION 3.1.2  The total cost was the lowest/R780 compared to R810  the output was the highest/R1 720 compared to R1 680   A greater output  for a lower cost  (Any 1) (2) 3.2 How the structures help the farm animals to survive adverse environmental conditions (a) Shelter - Has sides for protection against cold winds/reduce the wind chill/the enclosed area keeps heat within/insulation  (1) (b) Insulation material - Heat can be retained/protection against cold/ heat for a longer period of time/cooling effect  (1) (c) Roofing - For protection against rain/cold/direct sunlight  (1) Copyright reserved Please turn over

Downloaded from hlayiso.com Agricultural Sciences/P1 6 DBE/2023 SC/NSC – Marking Guidelines 3.3 Temperature requirements of broilers at different ages 3.3.1 The temperature requirements at three weeks 25°C  (1) 3.3.2 The trend of temperature requirements over a period of 7 weeks Temperature requirements decline with increased age  until it stabilizes from week 5 to 7  (2) 3.3.3 Line graph showing the temperature requirements of broilers at different ages for the first month Temperature requirements of broilers at different ages for the first month Temperature requirements (oC) 40 35 30 25 20 15 10 5 0 Week 1 Week 2 Week 3 Week 4 Age (weeks) CRITERIA/RUBRIC/MARKING GUIDELINES  Correct heading   X-axis: correct calibrations and labelling (Age)   Y-axis: correct calibrations and labelling (Temperature requirements)   Correct units (°C and weeks)   Line graph   Accuracy (80% + correctly plotted)  (6) 3.4 Handling facility 3.4.1 Identification of the handling facility Holding pen/paddock  (1) 3.4.2 TWO reasons for restraining farm animals in a crush  To ensure safety while working with large animals/no harm to the handlers   To be able to work with animals while they are stable   To perform specialised practices on animals/AI/dehorning/ castration/tattooing/branding/medication/physical examinations   Time and labour efficient  (Any 2) (2) Copyright reserved Please turn over

Downloaded from hlayiso.com Agricultural Sciences/P1 7 DBE/2023 SC/NSC – Marking Guidelines 3.4.3 TWO basic guidelines when handling cattle  Keep safety as the main principle in mind   Cattle should be kept as calm as possible   Use the correct handling equipment/facilities   No carrying of sticks/beating/throwing stones   No shouting/whistling/wild gestures   Move around slowly/no running around   Keep animals of the same size/age/sex together   Separate sick/old/pregnant animals from healthy animals   Limit the number of people in a facility   Do not approach animals from behind   Announce your presence through touch to the animal’s front or side   Let cattle in and out in the same manner/use routine  (Any 2) (2) 3.5 Animal diseases 3.5.1 Completing the table on animal diseases A - Virus  (1) B - Mastitis  (1) C - Poultry/cattle/pigs/sheep  (1) D - Fleece contains hard lumps/crusts/scabs on the ears/lips/face/ shanks/scrotum/sores on the skin/loss of wool  (1) 3.5.2 TWO preventative measures for controlling Newcastle disease  Timely diagnosis and vaccination against diseases   Outbreaks must be detected quickly   Good husbandry must be practiced/housing/nutrition/ management   Movement of animals should be controlled   Proper hygiene/sanitation/clean   Use breeds resistant to diseases   Quarantine/isolation   Proper disposal of carcasses  (Any 2) (2) 3.5.3 TWO financial implications of animal diseases  Decrease in production/poor quality   Stock losses/death   Decrease in income/profit   Banning of exports/international trade decreases   Have negative impact on food security   High cost to control/treatment  (Any 2) (2) 3.6 Letters representing stages in the life cycle of the parasite (a) B (1) (b) D (1) (c) E (1) (d) C (1) Copyright reserved Please turn over

Downloaded from hlayiso.com Agricultural Sciences/P1 8 DBE/2023 SC/NSC – Marking Guidelines 3.7 TWO symptoms of urea poisoning in farm animals  Nervous symptoms/lack of balance/incoordination   Excessive salivation   Frequent defecation and urination   Struggling violently/bellowing   Bloating   Tetany/muscular pain   Breathing difficulty   Rapid death  (Any 2) (2) [35] QUESTION 4: ANIMAL REPRODUCTION 4.1 The reproductive systems of farm animals 4.1.1 The letter representing the part in the diagrams (a) D (1) (b) G (1) (c) B (1) 4.1.2 A membrane responsible for implantation Endometrium  (1) ( 4.1.3 The part performing the same function as the testis C (1) 4.1.4 TWO congenital defects of the testes  Cryptorchidism   Hypoplasia  (2) 4.2 Pie chart 4.2.1 Duration of the oestrus cycle in cows 21 days  (1) ( 4.2.2 Oestrus stages (a) B - Di-oestrus  (1) (b) D - Oestrus  (1) ( 4.2.3 The letter representing the stage of oestrus cycle C (1) 4.2.4 TWO practical methods to identify a dairy cow in heat  Heat mount detector   Tail chalking/tail head marker   Pedometer   Chin-ball marker   Heat observation   Androgenised females  (Any 2) (2) 4.2.5 What happens to the corpus luteum if the cow becomes pregnant Corpus luteum persists and continue to secrete progesterone  (1) Copyright reserved Please turn over

Downloaded from hlayiso.com Agricultural Sciences/P1 9 DBE/2023 SC/NSC – Marking Guidelines 4.3 Mating behaviour 4.3.1 TWO factors regulating mating behaviour  Hormonal influences   Social interaction   Senses/sight/smell   Environmental factors   Physiological factors   Previous experience   Health   Genetic factors   Libido  (Any 2) (2) 4.3.2 Substance in cow's urine that stimulates libido in bulls Pheromones  (1) (2 4.4 Reproductive techniques 4.4.1 Identification of a reproductive technique (a) Cloning  (1) (b) Synchronization of oestrus/embryo transfer  (1) 4.4.2 Definition of embryo transfer The transfer of embryo from a genetically superior female animal (donor)  to the uterus of genetically inferior female animal (recipient)  (2) (2 4.4.3 TWO advantages of Artificial insemination  Reduces the exchange of sexually transmitted diseases   Superior male animal can fertilize more female animals   Semen from males in other countries can be used   Quick and economical way to improve the herd   Valuable tool in assisting with progeny testing   Semen can be used long after bull’s death   Possible where mating is impossible   No need to buy, keep and maintain expensive bulls   Inferior bulls can be detected at an early stage and avoided   AI increases the reproductive and conception rate  (Any 2) (2) 4.4.4 Reproductive stage following immediately after successful insemination Fertilisation  (1) (2 4.5 Parturition 4.5.1 Scientific term for difficult birth Dystocia  (1) Copyright reserved Please turn over

Downloaded from hlayiso.com Agricultural Sciences/P1 10 DBE/2023 SC/NSC – Marking Guidelines 4.5.2 TWO causes of dystocia  Deviation of the head   Flexion of elbow   Retention of one or both forelegs   Hydrocephalus   Congenital defects/abnormalities/malformed foetus   Twinning/multiplets   Posterior/incorrect presentation   Age of the animal   Large foetus   Dead foetus   Torsion of the uterus  Uterine inertia/weak contractions/labour   Prolonged gestation period   Size of the pelvic area   Poor body condition   Incomplete cervical dilation   Vaginal tear/injuries   Diseases  (Any 2) (2) 4.5.3 Hormone responsible for the relaxation of the cow’s muscles Relaxin  (1) 4.5.4 THREE noticeable behavioural changes in a cow which is about to give birth  Isolation/nesting behaviour   Stops eating/lack of appetite   Making bellowing noises   Restlessness/signs of discomfort because of pain   Urinates and defecates often  (Any 3) (3) 4.6 Milk production in cows 4.6.1 The hormones responsible for (a) Milk production - Prolactin  (1) (b) Milk release - Oxytocin  (1) 4.6.2 TWO stimuli enhancing the release of milk  Touching/washing/massaging of the udder   Sound of the milking machine   Presence/sight of the calf/suckling of the calf   Presence of the milker  (Any 2) (2) [35] TOTAL SECTION B: 105 GRAND TOTAL: 150 Copyright reserved