LIFE SCIENCES P2 MEMO GR10 NOV2020_English_hlayiso.com_.pdf

NATIONAL SENIOR CERTIFICATE GRADE 10 NOVEMBER 2020 LIFE SCIENCES P2 MARKING GUIDELINE (EXEMPLAR) MARKS: 150 This marking guideline consists of 9 pages.

2 LIFE SCIENCES P2 (EC/NOVEMBER 2020) SECTION A QUESTION 1 1.1 1.1.1 B  1.1.2 A  1.1.3 D  1.1.4 D  1.1.5 B  1.1.6 D  1.1.7 B  1.1.8 D  1.1.9 D  1.1.10 C  (10 x 2) (20) 1.2 1.2.1 Cardiac  1.2.2 Haemoglobin  1.2.3 Tissue fluid  1.2.4 Hibernation  1.2.5 Altitude  1.2.6 Global warming  1.2.7 Deforestation  1.2.8 Tectonic plate  1.2.9 Glossopteris  (9 x 1) (9) 1.3 1.3.1 None  1.3.2 B only  1.3.3 B only  1.3.4 B only  (4 x 2) (8) 1.4 1.4.1 1 – Aorta  4 – Septum  6 – Tricuspid valve  (3) 1.4.2 Lungs  (1) 1.4.3 Ventricular systole  (1) 1.4.4 Low in oxygen  (1) Copyright reserved Please turn over

(EC/NOVEMBER 2020) LIFE SCIENCES P2 3 1.5 1.5.1 (a) Ordovician  (1) (b) Trilobites  (1) 1.5.2 Geological time scale  (1) 1.5.3 Cambrian  (1) 1.5.4 Relative dating  (1) 1.5.5 Index fossil  (1) 1.5.6 Palaeontologist  (1) TOTAL SECTION A: 50 Copyright reserved Please turn over

4 LIFE SCIENCES P2 (EC/NOVEMBER 2020) SECTION B QUESTION 2 2.1 2.1.1 2 – Sinoatrial node  3 – Atrioventricular node  (2) 2.1.2 Septum  (2) 2.1.3 If the medulla oblongata  /brain detects too much CO2  / a drop in blood pressure, it sends an impulse to the sinoatrial node  which causes the atria to contract  Then the atrioventricular node  causes the ventricles  to contract faster  (Any 4) (4) 2.1.4 Cholesterol  / plaque build-up (1) 2.1.5 A stent  (1) 2.1.6 The stent holds the blocked artery open  so that blood can flow through  (2) 2.1.7 Improved diet  More / regular exercise  Medication  (3) 2.2 2.2.1 An area with a distinct climate  together with the plants and animals that live there  (2) 2.2.2 Grass  Aloe  Spekboom  Mark first TWO only (Any 2) (2) 2.2.3 Kudu  Locust  Sunbird  Mark first ONE only (Any 1) (1) 2.2.4 Hawk  Adder  Mark first ONE only (Any 1) (1) Copyright reserved Please turn over

(EC/NOVEMBER 2020) LIFE SCIENCES P2 5 2.2.5 Thicket biome food web Adder Hawk Lizard Kudu Locust Sunbird Spekboom Grass Aloe Mark Allocation: Title  Arrows facing right way  ALL organisms used in food web  ALL connections logical / feasible  (4) 2.3 2.3.1 Nirogen fixation  (1) 2.3.2 As nitrates  / NO3 (1) 2.3.3 Precipitation  (1) 2.3.4 Eutrophication  (1) 2.3.5 Nutrient runoff / eutrophication causes algae to grow rapidly  / an algal bloom which can block light  Plants in the water may die as a result  Decomposing bacteria remove oxygen from the water  Causing other organisms to die too  (Any 3) (3) 2.4 2.4.1 Light  (1) 2.4.2 The tilt of the Earth’s axis causes one side of the planet to face towards the sun  while the other side faces away from the sun  The side that faces towards the sun receives more light  and experiences summer,  while the side that faces away receives less light  and experiences winter  (Any 3) (3) 2.4.3 (a) Photoperiod  (1) (b) Seasonal movement of animals from one place to another  in response to climatic conditions  (2) (c) To avoid cold conditions  To find more food  To find more water  Mark first ONE only (Any 1) (1) Copyright reserved Please turn over

6 LIFE SCIENCES P2 (EC/NOVEMBER 2020) 2.5 2.5.1 (a) Protista  (1) (b) Chitin  (1) (c) Cellulose  (1) (d) Autotrophic  (1) 2.5.2 Has a true nucleus  (1) 2.6 2.6.1 Mammalia  (1) 2.6.2 Panthera leo Name: Panthera leo  Underlined  (2) 2.6.3 To avoid confusion  / be accurate as common names vary from region to region  (2) [50] Copyright reserved Please turn over

(EC/NOVEMBER 2020) LIFE SCIENCES P2 7 QUESTION 3 3.1 3.1.1 Type of plant  (1) 3.1.2 Weight increase of three plant species after one month 80 70 Weight Increase (g) 60 50 40 30 20 10 0 Aloe Prickly Pear Spekboom Type of Plant Mark Allocation: Type of Graph (T) 1 Mark Caption (C) Both variables included 1 Mark X and Y axis labels and Y axis unit (L) 1 Mark X and Y axis scales and bars same width (S) 1 Mark Plotting of points (P) No bars plotted correctly 0 Marks 1–2 bars plotted correctly 1 Mark All bars plotted correctly 2 Marks (6) 3.1.3 So that they can know what the increase in weight is at the end  (1) 3.1.4 They chose plants of the same height  They put the plants in equal sized pots  All plants had the same type of soil  All plants had the same amount of soil  All plants were in the same location  All plants received the same amount of water  Mark first TWO only (Any 2) (2) 3.1.5 Increase the sample size  and repeat the experiment  (1) 3.1.6 71 × 100  = 8,88%  (2) 800 3.1.7 When plants absorb CO2 out of the atmosphere they use it to create organic compounds  / carbohydrates which they use to grow  The more they grow the more they gain weight  (Any 2) (2) Copyright reserved Please turn over

8 LIFE SCIENCES P2 (EC/NOVEMBER 2020) 3.2 3.2.1 (a) Trilobite  (1) (b) Ammonite  (1) 3.2.2 The organism dies and covered rapidly  by sediment  / silt As time passes layers of sediment build up over the body  The layers compress  / are squashed by immense pressure building up  Minerals begin to replace animal tissues  and the body petrifies  (Any 4) (4) 3.2.3 Frozen in ice  Trapped in tar  Trapped in amber  (Any 2) (2) 3.2.4 Radiometric dating  (1) 3.3 3.3.1 They were thought to be extinct  Yet have existed unchanged  for millions of years  (Any 2) (2) 3.3.2 Off the coast of East London  (1) 3.3.3 Transition fossils  (2) 3.3.4 Archeopteryx  Thrinaxodon  Lystrosaurus  (Any 1) (1) 3.4 3.4.1 No  (1) 3.4.2 Yes  Genetic evidence shows that missing links may not be missing links at all  These organisms are continually evolving  Which suggests that they are part of their own group  (Answer + Any 2) OR No.  The features of these organisms  still suggest links between different groups of organisms  Just because the coelacanth is not a missing link does not mean that others aren’t too  (Answer + Any 2) (3) Copyright reserved Please turn over

(EC/NOVEMBER 2020) LIFE SCIENCES P2 9 3.5 3.5.1 Mass extinctions  (1) 3.5.2 Event 3  (3) 3.5.3 A volcanic eruption released particles into the air  which blocked out the sun  For long periods of time  Lowering temperatures on Earth  causing many organisms to go extinct as they could not adapt  (Any 3) (3) 3.5.4 Asteroid impact  Continental drift  (2) 3.6 3.6.1 Mrs Ples  (1) 3.6.2 Fossil tourism  (1) 3.6.3 West Coast Fossil Park  Kitching Fossil Exploration Centre  Museums  Mark first TWO only (Any 2) (2) 3.6.4 Tourists visiting the area  Create a need for jobs  / employment Such as tour operators  / ticket sales / restaurant owners. Tourists may also buy curios  Stay in B&B’s  / hotels All of which generate income  for the local community. The government may also upgrade facilities  in their area Which improves their living conditions  (Any 4) (4) [50] TOTAL SECTION B: 100 GRAND TOTAL: 150 Copyright reserved Please turn over