Mathematical Literacy Grade 11 IEB June 2019 Memo

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Downloaded from hlayiso.com MEMO GRADE 11 JUNE 2019 QUESTION 1 1.1 1.1.1 1.1.2 1.1.3 1.1.4 1.1.5 1.1.6 1.1.7 1.1.8 1.1.9 1.1.10 C A B C C A D D B B [10] 1.2 F G K A D B C J E L [10] 1.3 1.3.1 - set apparatus up under water to ensure that no air bubbles are in the system - cut stem under water ………… - seal all glass joints with Vaseline…… - cut stem at an angle to expose as much xylem as possible (Any TWO) (2) 1.3.2 The rate of transpiration will increase as the temperature increases. (2) 1.3.3 Indep var is temperature (1)[5] 1.4 1.4.1 A – RA C – LV Y – AORTA (3) 1.4.2 Closed, closed, open (3)[6] 1.5 1.5.1 (peritubular) capillary (1) 1.5.2 mitochondrion (1) 1.5.2 cuboidal epithelial cell with brush border to increase surface area for absorption (3)[5] 1.6 1.6.1 Longitudinal cross section of a root hair cell (1) 1.6.2 Large vacuole to store/absorb as much water and mineral salts from the soil as possible (2) 1.6.3 Vacuolar pathway (1)[4] {40} 1

Downloaded from hlayiso.com QUESTION 2 2.1 2.1.1 Time (1) 2.1.2 Only one variable can be changed at a time so if the environment is being changed then the other variables must remain the same, therefore the same leafy shoot must be used (2) 2.1.3 To prevent water vapour evaporating off the surface of the water so leading to the apparatus losing mass (2) 2.1.4 Grow vegetables in a greenhouse to increase the level of humidity around the plants so decreasing loss of water by transpiration (2)[7] 2.2 2.2.1 Xylem – mesophyll Mesophyll – film of water Film of water – evaporation into air space as vapour Transpiration out of the guard cells due to potential difference in the atmosphere and the air space (6) 2.2.2 1 – lignin rings for strength and preventing xylem from collapsing in from transpirational pull 2 – cuticle to prevent excess water loss from leaf surface (2) 2.2.3 wind, humidity, amount of sunlight (3)[11] 2.3 2.3.1 hip, knee, elbow (2) 2.3.2 X = hyaline cartilage Y = synovial fluid , arthritis = wearing away of hyaline cartilage and inflammation of synovial fluid etc (4)[6] 2.4 2.4.1 vertebra, ilium, femur (3) 2.4.2 large surface area for attachment of muscles for leg movement (1) 2.4.3 a) cancellous/spongy (1) b) slight flexibility at the joint (1)[6]{30} 2

Downloaded from hlayiso.com QUESTION 3 3.1 3.1.1 Urine production rate dec; urine solute conc increases (2) 3.1.2 a) 19 mg/ml (1) b) 0,1 l/hr (1) 3.1.3 0,1litres = 100ml 17,5 mg/ml therefore 17,5 x 100ml = 1750 mg (2)[6] 3.2 3.2.1 Diagram to show a longitudinal section of a kidney nephron (2) 3.2.2 A afferent arteriole B Bowman’s capsule C renal vein D distal convoluted tubule (4) 3.2.3 X = F (Bowman’s capsule cavity) Y = A (afferent arteriole) Z = D (distal convoluted tubule) (3) 3.2.4 A would have more nitrogenous wastes than C/less oxygen etc (2) [11] 3.3 3.3.1 Yes/No with two reasons [3] 3.4 3.4.1 Hypertension (2) 3.4.2 lessen the force with which the heart muscle contracts; reduce blood vessel contraction (4)[6] 3.5 3.5.1 Heading (7) VESSEL LUMEN MUSCLE LAYER VALVES ARTERY NARROW THICK NONE CAPILLARY VERY SMALL NONE NONE VEIN WIDER THIN PRESENT 3

Downloaded from hlayiso.com 3.5.2 The diagram illustrates the internal structure√ of an artery, capillaries and a vein and indicates the direction of blood flow√ through all three (2) 3.5.3 i) aneurysm is a weak part of an arterial wall√ which may burst√ without warning/symptoms√. Results in extreme internal bleeding√ and almost instant death√ ii) stent is a wire “basket”√ inserted via a large artery e.g. femoral√ until it reaches the blockage/clot in an artery√. Balloon is inflated to open stent√ and stent remains to ensures artery remains open√ iii) by-pass is required when coronary artery is blocked√ vein removed from leg√ attached to aorta√ and then attached after the blockage√ blood now flows from aorta to part of the heart originally starved of oxygen√ (5)[14]{40} TOTAL Q2-3 (70) QUESTION 4 [40] SOURCE YES, USE HYDRO NO, USE SOLAR ETC A Use for Intro B √ C √ √ D √ E √ F √ G √ √ H √ I √ J √ I was so set on making sure that there were sufficient sources to support hydroelectric that I feel that I have now overdone the number of sources supporting it. Quite a few articles have arguments for both sides. Is that too confusing? 4

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