LIFE SCIENCES P1 GR11 MEMO NOV2017 English hlayiso.com

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE GRADE 11 NOVEMBER 2017 LIFE SCIENCES P1 MARKING GUIDELINE MARKS: 150 This marking guideline consists of 10 pages.

Downloaded from hlayiso.com 2 LIFE SCIENCES P1 (EC/NOVEMBER 2017) SECTION A QUESTION 1 1.1 1.1.1 A  1.1.2 C  1.1.3 A  1.1.4 D  1.1.5 D  1.1.6 A  1.1.7 C  1.1.8 B  1.1.9 B  1.10 C  (10 x 2) (20) 1.2 1.2.1 Chlorophyll  1.2.2 Photolysis  1.2.3 Stroma  1.2.4 Villi  1.2.5 Assimilation  1.2.6 Kwashiorkor  1.2.7 Extinction  1.2.8 Pioneer  (8 x 1) (8) 1.3 1.3.1 A only  1.3.2 B only  1.3.3 Both A and B  (3 x 2) (6) Copyright reserved Please turn over

Downloaded from hlayiso.com (EC/NOVEMBER 2017) LIFE SCIENCES P1 3 1.4 1.4.1 Logistic  / S-shaped (1) 1.4.2 A – Lag phase /Establishment phase (1) B – Exponential /Geometric phase (1) C – Decelerating growth phase  (1) D – Equilibrium phase / Stationary phase/Equilibrium (1) 1.4.3 (a) D (1) (b) B (1) (c) B (1) (d) C (1) 1.5 1.5.1 Developing population  (1) 1.5.2 Female  (1) 1.6 1.6.1 To destarch  the plant (1) 1.6.2 (a) Leaf A  (1) (b) Leaf B  (1) 1.6.3 Absorbs CO2  (1) 1.6.4 (Diluted) Iodine solution  (1) TOTAL SECTION A: 50 Copyright reserved Please turn over

Downloaded from hlayiso.com 4 LIFE SCIENCES P1 (EC/NOVEMBER 2017) SECTION B QUESTION 2 2.1 2.1.1 Blue  (1) 2.1.2 (a) Colour of light  (1) (b) Rate of photosynthesis  (Time taken to release 20 bubbles) (1) (c) the light intensity / the pondweed / the time exposed (2) 2.1.3 80+40+160+140+70 490  OR 5 5 = 98  seconds (2) 2.1.4 Time taken to release 20 bubbles under light of different colours 180 Time taken to release 20 bubbles 160 140 120 100 80 60 (Seconds) 40 20 0 Violet Green Blue Red Yellow Colour of light Mark allocation for the graph Bar graph drawn (T) 1 Title of graph (both variables included) 1 Correct scale for X-axis (equal width and 1 spacing of the bars) and Y-axis (S) Correct label and unit for X-axis and Y-axis (L) 1 Plotting of bars (P) 0: No bars plotted correctly 1: 1 to 4 bars plotted correctly 2: all 5 bars plotted correctly NOTE: If a line graph is drawn – marks will be lost for the ‘type and scale’. If a histogram is drawn – marks will be lost for ‘type of graph and correct scale’. (6) Copyright reserved Please turn over

Downloaded from hlayiso.com (EC/NOVEMBER 2017) LIFE SCIENCES P1 5 2.2 2.2.1 A – larynx  B – trachea  C – bronchioles  (3) 2.2.2 Process 1  (1) 2.2.3 Ribs are lifted/ chest cavity expands/ moves outwards.  Thoracic cavity enlarges / lungs are larger.  Diaphragm contracts / flattens/ moves downwards.  (Mark first TWO only.) (Any 2 x 1) (2) 2.2.4 D  – intercostal muscle  E  – diaphragm  (4) 2.2.5 Marks: Diagram 1 Oxygen diffusion into blood 1 Carbon dioxide diffusion out of blood 1 Any other 2 labels 2 (5) 2.2.6 - Increases the amount of moisture in the air  - because water evaporates  - prevents drying out of inner surface of lung  - which would prevent gaseous exchange / gases can only diffuse in a solution. (4) 2.2.7 - Cannot breathe /inhale/exhale/lungs collapse.  - No pressure difference between exterior and thoracic cavity.  (2) Copyright reserved Please turn over

Downloaded from hlayiso.com 6 LIFE SCIENCES P1 (EC/NOVEMBER 2017) 2.3 2.3.1 Malpighian body  (1) 2.3.2 A – Afferent arteriole  B – Efferent arteriole  (2) 2.3.3 The diameter of both A and B is the same.  Therefore, no high blood pressure created at the glomerulus.  Hence no filtration of plasma into the capsular space occurs / no ultra-filtration / filtration (3) [40] Copyright reserved Please turn over

Downloaded from hlayiso.com (EC/NOVEMBER 2017) LIFE SCIENCES P1 7 QUESTION 3 3.1 3.1.1 (a) D  – Contains proteins/highest flow rate  (2) (b) B  – High concentration of glucose, but no proteins  (2) (c) C  – No glucose and lower concentration of sodium / the urea is higher in concentration than in D  (2) (d) A  – Has the highest concentration of urea  (2) 3.2 3.2.1 Mark and recapture  / Petersen method (1) 3.2.2 Indirect  (1) 3.2.3 Snails live in the garden where plants are watered regularly /rain and the mark will wash off if it is not water resistant.  (2) 3.2.4 So that snails get only enough time to mix with the rest, but not breed  or perhaps so long that some may die in between.  (2) 3.2.5 FxS PxM 60 x 5 P=   F=   F=  M S 15 = 20 snails in the first sample  (4) 3.2.6 Increase the sample size  Repeat as many times possible and get the average  (2) 3.3 (a) The maximum number of individuals  that can be supported by the environment  under the conditions prevailing at any given time. (2) (b) The changes in a community over time  which involves species in one stage being replaced by different species.  (2) 3.4 3.4.1 Absorbs carbon dioxide  from the air entering the apparatus. (1) 3.4.2 To prevent photosynthesis  (1) 3.4.3 To ensure that only gas is transferred to B  and prevents transfer and mixing of sodium hydroxide with lime water in B.  (2) 3.4.4 B– Lime water will still be clear  because the incoming air was free of carbon dioxide  because it was absorbed by soda lime and sodium hydroxide solution.  D– Lime water turns milky  because the plant respired and released carbon dioxide.  (5) Copyright reserved Please turn over

Downloaded from hlayiso.com 8 LIFE SCIENCES P1 (EC/NOVEMBER 2017) 3.5 3.5.1 Cheese, yoghurt, wine, beer, whisky, brandy. (Any other relevant products) (Any 1 x 1) (1) (Mark the first ONE only.) 3.5.2 - Products are exported  and earns foreign exchange  - Jobs are created and reduces unemployment/ more people have a source of income. - Company profit increases  and government earns more revenue as taxes.  (Mark the first TWO only.) (Any 2 x 2) (4) 3.5.3 Derives energy  for cellular activities.  (2) [40] TOTAL SECTION B: 80 Copyright reserved Please turn over

Downloaded from hlayiso.com (EC/NOVEMBER 2017) LIFE SCIENCES P1 9 SECTION C QUESTION 4 Digestion  Carbohydrates are broken down to smaller size by teeth   and the stomach churns/ mixes the food  to become a liquid  which is known as chyme.   Carbohydrases/ amylase   in the saliva,   in the pancreatic juice   and intestinal juice  break down the  polysaccharides (starch)   to disaccharides  and  eventually to monosaccharides (or examples)   in an alkaline  medium Max. 9 Absorption  Glucose  in small intestine  moves  and by active transport  which requires energy   and by diffusion  passive/ no energy required   through the columnar epithelial cells   into the blood capillaries   of the villus.  Max. 4 Transportation  The blood capillaries in the villi join together   and eventually form the hepatic portal vein   This blood vessel carries the product to the liver   Processed nutrients,  leave the liver in the hepatic veins   The hepatic veins join up with the inferior vena cava   that takes the blood to the heart   The heart then will pump the nutrient-rich blood to the whole body/cells/tissues   via the aorta  Max. 4 Copyright reserved Please turn over

Downloaded from hlayiso.com 10 LIFE SCIENCES P1 (EC/NOVEMBER 2017) ASSESSING THE PRESENTATION OF THE ESSAY Criterion Relevance(R) Logical sequence(L) Comprehensive(C) Generally All information Facts are arranged in All aspects required by provided is relevant a logical/ sequential the essay have been to the question. order. sufficiently addressed. In this Only information Events leading from Learner has scored at essay relevant to the digestion up to the final least: process of transportation of - Digestion (5) carbohydrate carbohydrates are - Absorption (3) digestion / discussed in the - Transportation (3) absorption and correct sequence. transportation is discussed. (No irrelevant information) MARK 1 1 1 Synthesis (3) TOTAL SECTION C: 20 GRAND TOTAL: 150 Copyright reserved Please turn over