Life Sciences Grade 11 September Test 2017 Paper & Memo

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Life Sciences Downloaded from NlAYiSO GAM cst september 2617 NSC 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 answers 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 must be done in pencil and labelled in blue or black ink. ( \ 7. Draw diagrams, flow charts or tables only when asked to do so. 8. The diagrams in this question paper are NOT necessarily drawn to scale. 9, Do NOT use graph paper. 10. You must use a non-programmable calculator, protractor and a compass where necessary. 11. Write neatly and legibly. Copyright Reserved Please Turn Over

_ Downloaded from hlayiso.com Life Sciences Common Test September 2017 SECTION A } QUESTION 1 1.1 Various options are given as possible answers to the following questions. Choose the answer and write only the letter (A to D) next to the question i number (1.1.1 to 1.1.5) in the ANSWER BOOK, for example 1.1.6 D. | | 1.1.4 The blood vessel that carries deoxygenated blood from the heart to the lungs is the ... pulmonary vein. pulmonary artery. renal vein. renal artery. UNW> QUESTIONS 1.1.2 AND 1.1.3 ARE BASED ON THE DIAGRAM BELOW. The diagram above represents the sectional front views of the chest region of a human during breathing movements. 1.1.2 Which breathing movement is represented by diagram A? Inhalation Exhalation Respiration Gaseous exchange oCOUY Copyright Reserved Please Turn Over

Life Sciences 1.1.3 1.1.4 Copyright Reserved NSC Downloaded from hlayiso.com Common Test September 2017 Below is a list of changes that occur during breathing. (i) The rib cage is lowered and the length of the thoracic cavity is decreased. (ii) The total volume of the thoracic cavity decreases and pressure on the lungs increases. (iii) (iv) Air is forced out of the lungs. The external intercostal muscles and diaphragm relax. Which ONE of the following represents the changes in the correct order that take place in the process represented by diagram B? A (i) >i) > ii B iw >) > @ c i) > Ww > (i) DW >@ > Ci) > (iv) > (ii) > > (i) A muscular sac which stores urine temporarily is the ... kidney. ureter. bladder. urethra. vUOULY Which ONE of the following would be the result of a person drinking a large volume of water? Amount of ADH | Reabsorntion of “| votume of urine secreted kidney tubule produced A {Decreases Decreases Increases B_ | Decreases Increases Decreases C | Increases Decreases Increases D | Increases Increases Decreases (5 x 2) TOTAL SECTION A: (10) 10 Please Turn Over

Downloaded from hlayiso.com Life Sciences NSC SECTION B QUESTION 2 Common Test September 2017 2.1 Study the diagram representing a section through an alveolus and the surrounding blood capillary in the human body. 2.1.1 Identify: (a) Epithelial tissue B (b) Part (1) (1) 2.1.2 Explain why point Y has a higher concentration of oxygen than point X. — (2) 2.1.3. Identify the gas represented by 1. 2.1.4. State TWO forms in which the gas mentioned in Question 2.1.3 is transported in the blood. Copyright Reserved (1) (2) 7) Please Turn Over

Life Sciences Downloaded from hlayiso NSC 2.2 The diagram below represents the structure of the nephron. -com Common Test September 2017 The table below shows the concentration of some of the substances found in the nephron of a human being. 2.2.1 2.2.2 2.2.3 2.2.4 Part of the Urea Glucose | Proteins Salts nephron g/100 cm? | g/100 em? | g/100 cm? | g/100 cm? 2 0,03 0,10 8,00 0,72 3 0,03 0,10 0,00 0,72 6 2,00 0,00 0,00 1,50 Name the specialized cells found at part 1. Which substance: (a) Did not pass from part 2 to part 3 (b) Was completely reabsorbed from part 3 (1) Calculate the difference in the salt concentration between part 3 and part 6. Show ali working. Explain why the concentration of urea is greater in part 6 than in part 3. Copyright Reserved Please Turn Over

Life Sciences Downloaded from hlayiso.com 7 Common Test September 2017 ; _ NSC QUESTION 3 3.4 The table below shows the percentage of carbon dioxide (CO2) emitted by different sectors in a certain city in South Africa. SECTOR CO, EMISSION (%) Transport 25 Residential 27 Industrial 16 Commercial 28 Other 5 3.1.1 Identify the dependent variable in this investigation. (1) 3.1.2 Which sector emits the most carbon dioxide? (1) 3.1.3 Draw a pie chart to represent the data shown in the table above. Show all the working. (6) 3.1.4 Describe how an increase in the CO, concentration can lead to global warming. (3) (11) 3.2 Read the passage below and answer the questions. The fynbos vegetation is unique to South Africa. Approximately 68% of the plants are endemic. This vegetation grows in the south-western parts of the Western Cape Province. The vegetation of this biome grows in nutrient poor soil. They survive long dry summer conditions and frequent fires. Flora of the Cape is threatened by alien vegetation and habitat destruction by humans. Already many species are extinct from this biome. Hence, its conservation is a national conservation priority. 3.2.1 State ONE environmental condition mentioned in the passage under which fynbos grows. (1) 3.2.2 State how fynbos vegetation is threatened by alien vegetation. (1) 3.2.3 Suggest TWO reasons why humans need to conserve nature. (2) (4) [15] TOTAL SECTION B: 30 Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Life Sciences. NSC SECTION C QUESTION 4 Describe how poor farming practices may impact negatively on the availability of water, quality of water, and food security. Content: Synthesis: NOTE: NO marks will be awarded for answers in the form of flowcharts, tables or diagrams. TOTAL SECTION C: GRAND TOTAL: Copyright Reserved Common Test September 2017 (17) (3) [20] 20 60

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Life Sciences (Grade 11) 3 jon Test September 2017 + NSC. — Memorandum New’ * QUESTION 3 . 3.4 3.1.1. COz Emission” a) 3.1.2 Commercial sector” (1) 3.1.3 Transport: 25 + 100 x 360° =.90° Residential: 27+ 100 x 360° = 97,2°/97° Industrial: 15 + 100 x 360° =54° Commercial: 28 + 100 x 360° =100,8°/101° Other: 5+100 x 360° =18° The graph shows the percentage of CO, emitted by different sectors in a certain city in SA Criteria Mark allocation Correct type of graph (1) 4 Title of graph 7 Calculations/ working to determine the 1:1 to 4 calculations correct corréct proportions (C) 2: AILS calculations correct Proportions accurate for each sector/slice 1: 1-3 sectors drawn correctly Jabeled/key provided (P) 2: All 5 sectors drawn correctly Downloaded from hlayiso.com (8) 3.1.4 - Increased COzwill trap more heatY” - therefore preventing the escape of heat from the Earth ‘s surface” - leading to an enhanced greenhouse effect“ - raising the temperature on Earth ‘s surfaceY ~ Any @) (11) Copyright Reserved noe Please turn over Life Sciences (Grade, . 4 Common Test September 2017 NSC —- Memorandum 3.2 “3.2.4 - Nutrient poor soil¥ - Dry summer conditions” - Frequent fires” Any (1) (Mark first ONE only) 3.2.2 Alien vegetation take up space~/use up resources such as water and nutrients (1) 3.2.3 - To prevent extinction of species” - To preserve natural resources” - Economic benefit for humans¥ - Ecotourism” Medicinal plants/animals~ Any (2) (Mark fi first TWO only) (4) [15] TOTAL SECTION B: 30 * SECTION C QUESTION 4 Poor farming practices and availability of water - ‘Open drain irrigation’ - leads to loss of water by evaporation” - Contamination of water sources by fertilizer and pesticidesY - decreases the amount of clean waiter available~ - thus increasing the costs” involved in purification - Overgrazing” - leads to soil erosion’ - Water runs off rapidly instead of soaking into the groundY - Ploughing-of marginal lands unsuitable for cultivation” - and ploughing on the contour” - allows ihe caitle to form paths which soon form gullies~” - resulting in soil erosion” - This results in loss of available water” - due to excessive run-off¥ - Sediments build-up in streams, dams¥ - which reduce the capacity in storage dams Max (7) - To ensure high crop yields”, - farmers use large quantities of herbicides, pesticides and fertilizers - which pollutes the water Heads to eutrophication. - Addéd nutrients lead to an increase in algal growthy/algal bloom - These algae over-use afd deplete the oxygen in the water¥ Copyright Reserved . : Please turn over

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