Life Sciences Grade 12 Paper 1 NSC June 2013 Memo

Downloaded from hlayiso.com EDUCATION basic educations -1.; t: PRIVATE BAG X 14 Departmen’ PRETORIA Basic Education PUBLI REPUBLIC OF SOUTH APRIGAUNATIONS | SENIOR CERTIFICATE EXAMINATION BIOLOGY P1 STANDARD GRADE 2013 POSSIBLE ANSWERS MARKS: 150 This memorandum consists of 10 pages. Copyright reserved : Please turn over

Downloaded from hlayiso.com DEPARTMENT OF BASIC Biology/SG/P1 2 EGue, 7. ; SCE — Memorandum 2013 -08- 05 PRINCIPLES RELATED TO MARKING HG & SG BIOLOGY 2012 PRIVATE BAG X 110 1 if more information than marks allocated is given ana) : ore info ion than mari Ci iv Stop marking when maximum marks are reached and p' a bUBLIC ONS the right-hand margin. 2. If, for example, three reasons are required and five are given Mark the first three irrespective of whether ail or some are correct/incorrect. 3. \f whole process is given when only part of it is required Read all and credit relevant parts. 4. if comparisons are asked for and descriptions are given Accept if differences /similarities are clear. 5. If tabulation is required but paragraphs are given Candidates will lose marks for not tabulating. 6. lf diagrams are given with annotations when descriptions are required Candidates will lose marks. 7. if flow charts are given instead of descriptions Candidates will lose marks. 8. If sequence is muddled and links do not make sense Where sequence and links are correct, credit. Where sequence and links are incorrect, do not credit. If sequence and links become correct again, resume credit. 9. Non-recognized abbreviations Accept if first defined in answer. If not defined, do not credit the unrecognised abbreviation but credit the rest of answer if correct. 10. Wrong numbering if answer fits into the correct sequence of questions but the wrong number is given, it is acceptable. 11. If language used changes the intended meaning Do not accept. 12. Spetling errors If recognizable, accept provided it does not mean something else in Biology or if it is out of context. 13. If common names given in terminology Accept provided it is accepted at the memo discussion. Copyright reserved Please tum over fe

Downloaded from hlayiso.com DEPARTMENT GF BASIC | Biology/SG/P1 3 Epucaprag3 | SCE — Memorandum “| f : ; 2013 -85- 05 14. If only letter is asked for and only name is given (and vice versa) . No credit RIVATE BAG X 110 : PRETORIA 0001 15. If units are not given in measurements PUBLIC EXAMINATIONS Candidates will lose marks. Memorandum will allocate marks for units separately. 16. Be sensitive to the sense of an answer, which may be stated in a different way. 17. Caption All illustrations (diagrams, graphs, tables, etc.) must have a caption. 18. Code-switching of official languages (terms and concepts) A single word or two that appears in any official language other than the learner's assessment language used to the greatest extent in his/her answers should be credited, if it is correct. A marker that is proficient in the relevant official language should be consulted. This is applicable to all official languages. 19. | No changes must be made to the marking memoranda without consulting the Provincial Internal Moderator who in turn will consult with the External Moderator(s). 20. Only memoranda bearing the signatures of the UMALUSI moderators and distributed by the National Department of Basic Education via the Provinces must be used. Copyright reserved Please turn over fP

Downloaded from hlayiso.com Biology/SG/P1 4 | DEPARTMEDEE GR BASIC SCE — Memorandum b EDUCATION SECTION A 2013 -08- 95 PRIVAT! QUESTION 4 PRETORIA Doo!” PUBLIC EXAMINATIONS 14 144 AYY 1.1.2 Dvv 1130 AVY 114 BYY 1.15 cvy 1.1.6 Dvv 11.7 AVY 1.18 Cvv 1.1.9 cvv (9x2) (18) 1.2 1.2.1 Oxy-haemoglobinY 1.2.2 Mastication Vv 1.2.3 Peristalsis “ 1.2.4 Macronutrients / macroelementsY 1.2.5 CristaeY 1.2.6 Medulla OblongataY 1.2.7 Anaerobic respiration” / fermentation 1.2.8 Lactic AcidY (8x1) (8) 1.3 1.3.1 Cvv 1.3.2 DY¥v 1.3.3 Byv 1.3.4 HYY 1.3.5 AvY 1.3.6 Fvv (6x2) (12) 1.4 1.4.1 (a) ProducersY (1) (b) (secondary) consumers” (1) 1.4.2 (a) Spacey” Watery DiseasesV Foodv/ nutrients /mineralsY (Mark first TWO only) (Any 2 x 1) (2) (b) Poor rainfall” drought” extreme temperature changes” negative human activity” /(deforestation/acid rain/chemical dumping/pollution) any natural disasters” /(earthquake/floods/Tsunami/ hurricane / tornado/ volcanoes) (2) (Mark first TWO only) (Any2x1) (6) Copyright reserved Please turn over

Downloaded from hlayiso.com Biology/SG/P1 5 DBE/2013 SCE - Memorandum DEPARTMENT GF BASIC EDUCATION | 1.5 1.5.1 Vitamin Av/Retinol | 013 -06- 1.5.2 Nightblindness” H 2013 -08- 05 1.5.3 Scurvy” RETORIA 001 | PUBLIC EXAMINATIONS 1.5.4 Vitamin D v’/ Calciferol 155 Rickets” in children / osteomalacia in adults 15.6 Promotes clotting of blood “/ Formation of prothrombin (6) TOTAL SECTION A: 50 SECTION B QUESTION 2 21 2.1.1 The glucose concentration of the blood samples increases first” (from 0 to 8 hours to 128 mg/4 00cm’) and then decreases” (from 42 hours to 82 mg/100cm*) (2) 2.1.2 The individual ate a meal” high” in carbohydrates/glucose” (causing the blood glucose concentration to increase) (3) Copyright reserved Please turn over ff

Downloaded from hlayiso.com Biology/SG/P1 6 | DEPARTMEN IDOE ORBITS j SCE - Memorandum EQUCATION { 2.1.3 | 2013 -05- 05 j PRIVATE BAG X 119 PRETORIA 0004 —— | __.PUBLIC EXAMINATIONS Blood glucose concentration over a 24-hour period 5 140 E120 c ge 100 SZ 80 BE eo oe a 40 3 20 & a 0 4 8 12 16 20 24 Time (h) Rubric for the mark allocation of the graph: A Correct type of graph 4 B Title of graph 2 Cc Correct label for X-axis 4 D Correct unit for X-axis 4 E Correct label for Y-axis 4 F Correct unit for Y-axis 1 G Appropriate scale for X-axis | 1 H Appropriate scale for Y-axis | 1 I Plotting of points 1 = 1 to 5 points plotted correctly 2 =All_ points plotted correctly J All plotted points joined 1 NOTE: If wrong type of graph drawn: - Marks will be lost for 'correct type of graph'(A) and ‘plotting of points'(Il)and all ‘plotted points joined’(J) - If axes are transposed, marks will ONLY be lost for labelling and units for the X-axis(C and D) and Y-axis (E and F) (12) (17) P Preethlall Please turn over Copyright reserved UMALUSL (F

Biology/SG/P1 2.2 2.2.1 2.2.2 2.2.3 2.2.4 QUESTION 3 3.1 3.1.4 3.1.2 3.1.4 3.1.5 Copyright reserved Downloaded from hlayiso.com 7 DBE/2013 SCE - Memorandum DEPARTMENT OF BAS} EQUCATION 4 i Small intestine” i 7 i 2013 -08- 95 B : (circular) musclev’ layer iL PRIVATE BAG X 119 ETORIA OC C- villusv” i ORIA ocot D - Columnar epitheliumy PUBLIC EXAMINATIONS) Succus entericusv// intestinal juice -It is finger-like Vto ensure maximum absorption of digested nutrients” -has microvilli Vincreases the surface area for absorption” -thin walls “consist of a single layer of columnar epithelial tissue for the easy diffusion of nutrients” -many blood capillaries and lacteal~’ for effective transport ¥ of absorbed nutrients -secretion of mucus by goblet cells“ enhances diffusion” (Mark first ONE only) (Any 1 x 2) A- tracheaY B - bronchusv/cartilaginous ring D-ribsY E - bronchiolesY Protects internal organsv v /heartiungs Helps in ventilation/breathingY “ (Mark first TWO only) (Any 2 x 2) - Contracts” and flattensv - increases the volume of the chest cavity” - reduces pressure in lungs“ compared to pressure in the atmosphere” - air is drawn intov the lungs (max 3) Fv -Intercostal muscles” Lungs would collapse” Lungs unable to expand/inflatew no difference in pressure on lungsv/pressure inside equals pressure outside no mechanism for breathing/ventilation” /air cannot be drawn in and out of the lungs (Any 3) Please turn over (1) (2) [25] (4) (4) (3) (2) (3) (16)

Downloaded from hlayiso.com Biology/SG/P1 3.2 3.2.1 3.2.2 3.2.3 3.2.4 QUESTION 4 41 4.1.1 4.1.2 4.13 4.2 4.2.1 4.2.2 4.2.3 4.3 4.3.1 4.3.2 4.3.3 4.3.4 Copyright reserved 8 SCE — Memorandum a w a Sas 8 To show that carbon dioxide” is given off during respir el ad Bian & (Clear)Lime waterv S125 °? sis= (a) It absorbs the carbon dioxide from the incoming atty o (b) To test for the presenceY of carbon dioxide” @ i -Set up the apparatus as in the experiment” -leave out the living organism/rat in flask CY OR Just/remove rat onlyYY (165 + 135 )v = 300V kl” 1000Y - (600 + 300)Y= 100 kJ” (the final answer must have a unit) The chickens are warmer inside” v’/ they huddle together, so chickens maintain a higher body temperature/ there is less activity inside TemperatureY Enzymes denaturedv (lose shape)/ destroyed /damaged and the active site of enzyme does not fit into substratev /enzyme becomes functionless (a) Test tube 3v (b) The colour/white precipitate obtained after heating shows no proteins” present indicating that proteins are digestedvY Predation” /predator-prey relationship 300V 390v (Accept 385 — 395) 1999 Please turn over (3) (3) (2) (8) (1) (2) (1) () (1) (1) (1) (1) (4)

Downloaded from hlayiSO-COM, ware oF BASIS EDUCATION Biology/SG/P1 9 DBE/20TF SCE - Memorandum j 2013 -06- 95 44 4.41 360\Y =72Y per minute j PRIVATE BAG x11 (2 5 y oe j PRETORIA oco1 i |_PUBLIC EXAMINATIONS 4.4.2 It causes the pulse rate to increasevv (2 4.4.3 An increased pulse rate indicates: -an increase in blood flow to the musclesY -more O2 supplied to the muscles” -muscles will increase their rate of respiration’ -more COz2 will be produced in the muscle cellsY” -more CQ, will be removedY (Max 3) (3) (7) [25] QUESTION 5 5.1 5.1.1 To show that oxygen is released” during photosynthesis” (2) S32 Temperaturev of the water Number(amount) of air bubbles(gas/oxygen) releasedv’ (Mark first ONE only) (Any 1 x 1) (1) 5.1.3 Bubbles to be captured in a test tube” Then insert a glowing splint Vv The splint will burst into flames” indicating the presence of oxygen (3) 5.1.4 To ensure that the water bath” is kept at a constant temperature (2) (8) 5.2 5.2.1 DestarchY (1) 6.2.2 - to prevent the plant from receiving all factors, e.g. light” which is necessary for photosynthesis. - without light, no photosynthesis” - hence, no sugars and starch formedY (3) 5.2.3 Leaf will be prevented from receiving CO2 ~ for photosynthesis/ foil absorbs heat which will damage leaf tissue Leaf could eventually diev thus the results will be inconclusive (2) (6) 5.3 5.3.1 (a) Lean beef “and chickenY (2) (b) Milkv (1) (c) Lean beef “and chicken” (2) (d) Lean beef and chickenY (2) Copyright reserved Please turn over ?

Downloaded from hlayiso.com Biology/SG/P1 10 if DBEOTS~y SCE - Memorandum : a | 5.3.2 -Structural component of cell membranes” i ay i328 -all enzymes are proteins” ixigz oS -hormones are proteinsY 2] 2o dk SF HD -component of chromosomes” Sleo 7 -serve as food reserves and energy source’ 2 s = = -protective function e.g. antibodies” 3 6 -supporting function e.g. keratin” z a -transport function e.g. haemoglobin’ -acts as a buffer’ -muscle building(growth) “ - repair and replace worn out/dead tissue” (Mark first TWO only) (Any2x1) (2) §.3.3 - seed contains a lot of stored food as sugars/starch” - contain a lot of cellulosevin cell walls (2) (11) [25] TOTAL SECTION B: 100 GRAND TOTAL: 150 id kegpahe 0 ALLAY (NTE RNRL g. Preethlall MopEeeatue 28 Je s 20/3 23/ S} 2013 Copyright reserved