Life Sciences Grade 11 NSC Prelim 2016 Paper & Memo

« P Education KwaZulu-Natal Department of Education » REPUBLIC OF SOUTH AFRICA | t LIFE SCIENCES Ct | t COMMON TEST : | ‘ SEPTEMBER 2016 x CPP PTT TrTiTirrrrrrrrirrrrirrrrererreceeeer tl MARKS: 60 } TIME: 4 hour GRADE 11 NATIONAL SENIOR CERTIFICATE N.B. This question paper consists of 9 pages.

Life Sciences NSC September 2016 Common Test 2 INSTRUCTIONS AND INFORMATION Read the following instructions carefully before answering the questions: 1. Answer ALL the questions. 2. Write ALL the answers in the ANSWER BOOK. 3. Start the answer to EACH question at the top of a NEW page. 4. Number the answers correctly according to the numbering system used in this question paper. 5. Present your answers according to the instructions of each question. 6. ALL drawings should be done in pencil and labelled in biue or black ink. 8. Draw diagrams, flow charts or tables only when asked to do so. 9. The diagrams in this question paper are NOT necessarily drawn to scale. 10. Do NOT use graph paper. 11. You must use a non-programmable calculator, protractor and a compass where necessary. 12. Write neatly and legibly. Copyright Reserved Please Turn Over

Life Sciences NSC September 2016 Common Test SECTION A QUESTION 1 1.1 Various options are provided as possible answers to the following questions. Choose the correct answer and write only the letter (A — D) next to the question number (1.1.1 — 1.1.5) in the answer book, for example 1.1.6 D, 1.1.1 The rate of breathing is regulated by the medulla oblongata, mainly ... A under voluntary control. B according to the oxygen level of blood. Cc according to the blood pressure. D according to the carbon dioxide level of blood. 1.1.2 The following events occur during eutrophication: Aquatic algae grow rapidly Bacteria use large amounts of oxygen Nitrogen and phosphorus become highly concentrated in water Algae prevent light from reaching lower levels Fish die of suffocation APRONS The correct order in which eutrophication occurs, is... A 5 3 2 4 4 B 5 2 3 1 4 Cc 3 1 4 2 5 D 3 4 4 5 2 1.1.3 Which ONE of the following homeostatic functions of the kidney will be affected by damage to the hypothalamus of the brain? A Salt regulation B Excretion () Cc pH D Osmoregulation 1.1.4 One of the dangers of landfills is the contamination of underground water sources. This is prevented by ... covering the rubbish with a layer of soil. lining the landfill with an impermeable barrier. spraying water on the soil to keep dust levels down. compacting the waste so that water cannot penetrate it. GDOD> Copyright Reserved Please Turn Over

Life Sciences NSC 1.1.5 An investigation was conducted to determine the concentration of E.coli bacteria in a sewage contaminated river. The result of the investigation is given below: September 2016 Gommon Test Percentage of sewage/100mi 10 18 25 30 Percentage of E. coli/100ml 20 34 45 It can be concluded that ... A as the percentage of sewage increases, the concentration of E. coli in the water increases. an increase in percentage of sewage has no effect on the percentage of E.coli in the water. E. coli in the water decreases. B Cc as the percentage of sewage increases, the concentration of dD as the percentage of sewage decreases, the concentration of E. coli in the water increases. Copyright Reserved «: (6x2 10) TOTAL SECTION A: [10] Please Turn Over

Life Sciences NSC September 2016 Common Test 5 SECTION B QUESTION 2 2.1 Energy in South Africa is mainly generated from coal power stations. The pie chart below shows the energy consumption in different sectors of a South African city in 2007. Energy consumption in different sectors of a city Residential X% Transport 45% Industrial 17% Commercial 14% 2.1.1 Determine the value of X. Show ALL calculations. 2.1.2. The residential energy consumption in this city increased by 3% in 2009. Give ONE possible reason for this increase. 2.1.3 Explain the impact of the increased use of energy generated from coal power stations on global warming. 2.1.4 Explain ONE strategy that could be implemented by the South African government to achieve a reduction in its CO2 output. Copyright Reserved Please Turn Over (2) (1) (4) (2) (9)

Life Sciences NSC September 2016 Common Test 6 2.2 Study the diagram showing parts of the human exchange system and answer questions that follow. Parts of the human gaseous exchange system 2.2.1 Identify part A. 2.2.2 Identify the process represented by 1 and 2. 2.2.3 With regard to carbon dioxide and oxygen concentrations, which one will be the highest at: (a) X (b) Y 2.2.4 List TWO features visible on the diagram which make the above structure an efficient respiratory surface. Copyright Reserved Please Turn Over

Life Sciences QUESTION 3 NSC September 2016 Common Test 3.1. Study the diagram below of a longitudinal section through a kidney and answer the questions that follow. Longitudinal section of a kidney 3.1.1 Identify parts A and G. 3.1.2 State the LETTER and NAME of the blood vessel that contains the highest percentage of waste products. 3.1.3 Explain why urine in part H is sometimes very concentrated. Copyright Reserved Please Turn Over (2) (2) (5) (9)

Life Sciences NSsc September 2016 Common Test 8 3.2. A certain community living close to an industrial area witnessed the unexplained death of many fish and other aquatic organisms in the nearby river. Many members of the community accused the local chemical factory of disposing untreated acid containing effluent into the river. This incident triggered an investigation by learners at nearby school. The learners were instructed to monitor and record pH levels of two different sites A and B as indicated in the site diagram below, on a daily basis, for three weeks. Factory site THE RIVER Suspected untreated effluent disposal _ ( DIRECTION OF WATER FLOW . A summary of the recorded data is below. Study the information below and answer the questions that follow. pH of water at Site A pH of water at Site B Week 1 6,5 4,1 Week 2 6,8 3,5 Week 3 6,4 3,2 ( 3.2.1 State the aim of the above investigation. (2) 3.2.2 Mention any TWO steps to be considered when planning this investigation. (2) 3.2.3 Provide a reason for also testing the pH of water at Site A. (1) 3.2.4 State ONE way in which this investigation can be made more reliable. (6 [15] TOTAL SECTION B; 30 Copyright Reserved Please Turn Over

Life Sciences NSC September 2016 Common Test 9 SECTION C QUESTION 4 Describe how habitat loss through various human activities may lead to a loss of biodiversity. Content: Synthesis: NOTE: No marks will be awarded for answers in the form of flow charts, tables or diagrams. TOTAL SECTION C: GRAND TOTAL: Copyright Reserved (17) (3) [20] [60]

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Life Science (Memorandum) Grade 11 September 2016 Test 3 22 - 2.2.1 A~-Bronchus/bronchioies” (4) 2.2.2 Gaseous Exchange/diffusion’ (1) 2.2.3 (a) Carbon dioxidew (1} (b) Oxygenv (1) 224 alvacl Carb sroped/ - Numerous alveoli’ large surface area for exchange of gases - Thin epithelium made of single layer of cells” for rapid diffusion - Presence of blood capillaries~ for transport of gases (Any 2). (2) (Mark FIRST TWO onlyy (8) M15] QUESTION 3 3.4 3.44 - A Renal capsuleY - G: Renal calyx” ene ee (2). 3.1.2 Ev - Renal Artery V (2) 3.1.3 Copyright reserved . . . - When the body loses too much waterv/ wsesex we Lived us lone - the hypothalamus is stimulatedY - It secretes more ADHY - which makes the kidney tubules more permeableY - allowing for more water to be re-absorbed into the blood” - thus causing less water to be lost in the urine” (Any 5) (5) (2) Please turn over C | Life Science (Memorandum) Grade 11 | September 2016 Test 4 i | 32 3.2.1. To compare the pH at two sites” before and after effluent disposal v (2) ; : 3.2.2 - Formulate a hypothesis for testingY” | - Seek expert advice from relevant peopley ! - Decide on suitable site for sampling” \ - Organise ali the required chemicals and equipment before the start of the sampling process” | - Design a relevant recording sheetY - Obtain permission to enter the area requiredY” - Organise protective clothing such as gloves and bocts” - Decide on the volume of daily samples, depth at which sample is collected and time of sample takingv Any 2 : (2) (Mark first TWO only) ' 3.2.3 Sample from Site A is used as a control“/to compare the variations of DpH at site B. 1 (1) 3.2.4 - Repeat the investigation’ ! - Take more samples at each site” Any 4 : (1) (Mark first ONE only) j (8) ! £15] TOTAL SECTION B: 30 i SECTION C : QUESTION 4 : Copyright reserved ! As a resuit of urbanisation’ land is cleared for housing, industries and roadsv leading to habitat fragmentation” In monocutturew many species are removedY for the purpose of planting crop of a single species“ | As a result of overgrazingY the loss of topsoil/erosion increases” decreasing soil fertility” | decreasing the potential for plantv life When pesticides are used to kill pestsv | the chemicals enter the ground water” ‘ Please turn over

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