Life Sciences Grade 11 NSC Prelim 2018 Paper & Memo

education j Department: Education PROVINCE OF KWAZULU-NATAL NATIONAL SENIOR CERTIFICATE COMMON TEST SEPTEMBER 2018 MARKS: 60 TIME: 1 hour This question paper consists of 7 pages including this page.

Life Sciences 2 Common Test September 2018 NSC INSTRUCTIONS AND INFORMATION Read the following instructions carefully before answering the questions. 1. 2. 10. 11. Answer ALL the questions. Write ALL the answers in the ANSWER BOOK. Start the answers to EACH question at the top of a NEW page. Number the answers correctly according to the numbering system used in this question paper. Present your answers according to the instructions of each question. Make ALL drawings in pencil and label them in blue or black ink. Draw diagrams, tables or flow charts only when asked to do so. The diagrams in this question paper are NOT necessarily drawn to scale. Do NOT use graph paper. You must use a non-programmable calculator, protractor and a compass, where necessary. Write neatly and legibly. Copyright reserved Please turn over

Life Sciences 3 Common Test September 2018 NSC SECTION A QUESTION 1 Various options are provided as possible answers to the following questions. Choose the correct answer and write only the letter (A to D) next to the question number (1.1 to 1.5) in your ANSWER BOOK, for example 1.6 D. 14 Which ONE of the following substances is excreted by the skin, lungs and kidneys? A Urea B Uric acid C Water D Carbon dioxide Aa 2 What is the pH of urine likely to be if there is an excess of bicarbonate ions in the blood? A 5 B 6 Cc 7 D 8 1.3 A disadvantage of monoculture is that it decreases ... A biodiversity. B crop yield. Cc pesticide use. D herbicide use. 1.4 Study the characteristics below. (i) | Absence of natural predators in the habitat (ii) | Usually outcompeted by the natural vegetation in the area (iii) | Can be regulated through biological control (iv) Usually indigenous Which ONE of the following combinations of characteristics apply to alien- invasive plants? (ii) and (iv) only (i) and (iii) only (ii) and (iii) only (i) and (iv) only U0OUNDY Copyright reserved Please turn over

Life Sciences 4 Common Test September 2018 NSC 1.5 A reduction in the use of chlorofluorocarbons (CFCs) may contribute to ... A a higher incidence of skin cancer. B a lower incidence of damage to the eyes. Cc a depletion of the ozone layer. D an increase in global warming. (5 x 2) TOTAL SECTION A: SECTION B QUESTION 2 2.4 The diagram below represents a working model of the breathing system. rubber stopper drinking straw i = balloon | = plastic bottle rubber sheet A B 2.1.1 Name the part of the breathing system represented by the rubber sheet. 2.1.2 Give a visible reason why diagram B represents inhalation. 2.1.3 State how the action of this model differs from the similar mechanism in the human body. 2.1.4 Describe the process of exhalation that occurs in the human body. Copyright reserved Please turn over (10) 10

Life Sciences co] Common Test September 2018 NSC 22 The following diagram represents an alveolus and a blood capillary in the human lung. The arrows indicate the direction in which gases are moving. AIR 2.2.1 22:2 2.253. 2.2.4 Copyright reserved Will carbon dioxide move from A to B or from B to A? Explain ONE advantage of the fact that cell C passes through the capillary in a single row. In the disease emphysema, the alveolus becomes less lobed. Explain the effect that this could have on the process of gas exchange. Carbon dioxide is a greenhouse gas. Explain ONE consequence of an increased concentration of carbon dioxide in the atmosphere. Please turn over (2) (7) [15]

Life Sciences QUESTION 3 6 Common Test September 2018 NSC 3.1 The following graph shows the concentration of certain substances as they pass through the nephron of a person’s kidney. High * Concentration Low 3.1.1 Copyright reserved KEY —— waiter --- sodium settee glucose “= urea > aan sodium } i i aa Tarp pinnae aces CIICESE } RegionA Region B Region C Region D | | Bowman’s proximal loop of Henle pelvis capsule tubule distal and i collecting tubule Name the process that occurs in region: (a) A (b) B Name the metabolic waste product that occurs in higher concentration in urine than in blood. Give a reason for the increased concentration of the metabolic waste product named in QUESTION 3.1.2. Explain ONE way in which the Bowman’s capsule is adapted for its function. Using information from the graph, explain whether the person was suffering from: (a) Diabetes (b) Dehydration Please turn over (2) (10)

Life Sciences rd Common Test September 2018 NSC 82 The table below shows the percentage of water consumed by different sectors in South Africa. SECTOR AMOUNT OF WATER CONSUMED (%) Domestic 29 Agricultural - 59 Industry and mining 8 Commercial afforestation 4 3.2.1 Which ONE of the sectors listed above contributes most to eutrophication? (1) 3.2.2 State TWO effects of eutrophication. (2) 3.2.3 During periods of drought, consumers may experience water restrictions. Explain why these restrictions are likely to be imposed upon the domestic sector rather than the other sectors listed. (2) (5) [15] TOTAL SECTION B: 30 SECTION GC QUESTION 4 Describe the various factors that threaten food security. Content: (17) Synthesis: (3) (20) NOTE: NO marks will be awarded for answers in the form of flow charts, tables or diagrams. TOTAL SECTION C: 20 GRAND TOTAL: 60 Copyright reserved

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Life Sciences - Grade 11 a SECTION A QUESTION 1 LA | Cx 11.2 Dvv 1.1.3 AY 1.41.4 Byy 115 Byy SECTION B QUESTION 2 eae aaa 2.1.2 2.1.3 2.1.4 22) 221 2.2.2 2.2.3 22.4 Copyright reserved Septem. . Common Tesi 2018 Life Sciences — Grade 11 4 September Common Test 2018 NSC - Memorandum NSC - Memorandum QUESTION 3 S.A 3.4.1 (a) Glomerular filtration”? /Ultrafiltration/Filtration (1) (b) Tubular reabsorption” (1) 3.1.2 Ureav (1) 3.1.3. Water is reabsorbed from the renal tubule” OR Urea is excreted by epithelial cells of distal convoluted tubule into (5x2) (10) Itratew” (4) TOTAL SECTION A: i0 3.1.4 - Inner wallis a single layer of podocytes with slit poresY” - that allow only very small substances from blood to pass throughY OR - Bowman's capsule is cup-shapedv - to increase surface area for filtration’ Eiaphiagres oO) Mark first ONE only Any1x2 (2) iflated balloon v 3.1.5 (a) Nov - All glucose is reabsorbed at the proximal convoluted OR tubuleY/no glucose present in urine/pelvis (2) Lowered rubber sheet ¥/increase in volume of bell jar (1) - The movement of the rib-cage”/action of intercostal muscles (b) Yesv - A lot of water is reabsorbed” /very little water is present in urine/pelvis - cannot be demonstratedY (2) (aay - Diaphragm relaxesY - External intercostal muscles relax” 3.2 321 Agricultural (1) - The volume of the thoracic cavity decreases¥ Mark first ONE only - The pressure on the lungs/interpleural pressure increases” - Air leaves the lungs” and enters the atmosphere Any 4 (4) 3.2.2 - Rapid algal growthy (8) - Increased bacterial action/decompositionY - Depletion of oxygen in the water” BtoAv (1) - Death of plants & animals~ ; Mark first TWO only Any 2 (2) - Every cell is brought close to the alveolusY - to increase the amount of gases exchangedY (2) 32:3 - Water restrictions imposed on other sectors will negatively impact the economy~/food security of the country ~The surface area of the alveolus will decrease - Water restrictions on the domestic sector will affect the lifestyle thus decreasing the amount of gases exchangedY (2) of the individual” and not the country (2) - Leads to enhanced greenhouse effect¥ Be - causing global warming” /increase in average temperature of the Earth (2) (7) [15] Please turn over Copyright reserved Please turn over

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