LFSC-March-QP & Memo-2018-Gr10_hlayiso.com_.pdf

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Downloaded from hlayiso.com Life Sciences Common Test March 2018 NSC INSTRUCTIONS AND INFORMATION Read the following instructions carefully before answering the questions. Le 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. Do ALL drawings in pencil and label them in blue or black ink. 7. Draw diagrams, tables or flow charts 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 3 Common Test March 2018 NSC SECTION A QUESTION 1 1.4 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 (1.1.1 to 1.1.5) in your ANSWER BOOK, for example 1.1.6 D. Leif The cell organelles in which proteins are synthesised are the ... A chloroplasts. B ribosomes. Cc lysosomes. D mitochondria. QUESTION 1.1.2 AND 1.1.3 REFER TO THE DIAGRAMS BELOW. The diagrams below represent two cell organelles. A B 2um 12 Which ONE of the following combinations are processes that will be affected if organelles A and B were not present in a cell? A Photosynthesis and cellular respiration B Cellular respiration and mitosis Cc Mitosis and photosynthesis D Digestion and mitosis 1.1.3 What is the length of organelle B along the X — Y axis? 2um 2,5um 12um 10um UNWD Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Life Sciences Common Test March 2018 NSC 1.1.4 Which organelles store food in different forms such as starch? A Lysosomes B Leucoplasts Cc Mitochondria D Endoplasmic reticulum 1.1.5 Which organelles would you expect in large numbers in muscle cells to help an athlete during a race? Ribosomes Nucleus Mitochondria Golgi Apparatus 0uowDY (5 x 2) (10) TOTAL SECTION A: 10 Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Life Sciences Common Test March 2018 NSC SECTION B QUESTION 2 21 Study the diagram showing a phase of mitosis. ~\ | bcc y 2.1.1 Identify the phase shown in the diagram above. (1) 2.1.2 State TWO visible reasons for your answer to QUESTION 2.1.1. (2) 2yed Identify parts A and B. (2) 2.1.4 How many chromosomes: (a) | Were present in the original cell at the start of mitosis (1) (b) Are present in EACH cell in the diagram (1) 2.1.5 Explain the importance of interphase that occurs before mitosis. (2) Copyright Reserved Please Turn Over

Life Sciences Common Test March 2018 Downloaded from hlayiso.com NSC 2.2 Read the extract below. hair. 2.2.1 2:22 2.2.3 Copyright Reserved State ONE importance of mitosis stated in the passage. Mitosis is a type of cell division which amoeba relies on for asexual reproduction through binary fission. It also helps to replace damaged cells in all living organisms. Abnormal and uncontrolled mitosis of body cells may result in cancer. The extra cells form a growth or a tumor. These cells can be spread to other parts of the body. Chemotherapy is used to destroy cancer cells but may cause the loss of According to the passage, state the side effect of using chemicals to destroy cancer cells. Name and describe the phase of mitosis in which the nucleolus and nuclear membrane disappear. Please Turn Over

Life Sciences QUESTION 3 3.1 Downloaded from hlayiso NSC -com Common Test March 2018 An investigation was carried out to determine the effect of different concentrations of Sugar solution on the rate of movement of water across a membrane. The procedure was as follows: * Two thistle funnels were placed in beakers with an equal amount of pure water. * Acconcentrated sugar solution was placed in thistle funnel A and a dilute sugar solution was placed in thistle funnel B. * An egg membrane was used to separate each solution from pure water. The apparatus is shown in the diagram below. /—— Thistle funnel A Concentrated jon solution Beaker Thistle funnel B Pure water Egg membrane |—Dilute sugar solution The results of the investigation are shown in the table below. THISTLE INITIAL LEVEL OF | LEVEL OF SOLUTION FUNNEL SOLUTION FIVE HOURS LATER A 20 ml 30 ml B 20 ml 23 ml S14 For this investigation state the: (a) | Dependent variable (b) Independent variable Sef 2 State TWO ways in which the scientists could have ensured the reliability of the results. 3.1.3 Give a reason why the level of solutions in thistle funnel A and B were made equal at the start of the investigation. (1) 3.1.4 Explain why the rate of water movement was greater in A in comparison with B. Copyright Reserved (4) (9) Please Turn Over

Downloaded from hlayiso.com Life Sciences Common Test March 2018 Nee 3.2 The diagrams below represent two cells (X or Y) with their organelles. 8.2.4 Which cell (X or Y) represents a plant cell? (1) 3.2.2 State TWO visible reasons for your answer in QUESTION 3.2.1. (2) 3.2.3 Identify part E. (1) 3.2.4 Give the LETTER orly of the organelle that: (a) Has a secretory function (1) (b) | Acts as a communication system (1) (6) (15) TOTAL SECTION B: 30 Copyright Reserved Please Turn Over

Common Test March 2018 Downloaded from hlayiso.com Life Sciences NSC SECTION C QUESTION 4 We rely on crops produced by farmers for our source of vitamins, carbohydrates and proteins. To increase crop yield, farmers often use fertilizers. Provide a description for each of the following: 4.1 The structure and functions of carbohydrates and proteins (7) 4.2 Method used to test for the presence of proteins in a food sample (5) 4.3 Effect of fertilizers on the aquatic ecosystem when it is washed from the farms into rivers (5) Content: (17) Synthesis: (3) NOTE: NO marks will be awarded for answers in the form of flowcharts or diagrams. TOTAL SECTION C: 20 GRAND TOTAL: 60 Copyright Reserved

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Downloaded from hlayiso.com Life Sciences - Grade 10 3 i) Marking guideline QUESTION 3 3.1 3.1.1 (a) Rate of movement of waterY (b) Concentration of sugar solution” 3.1.2 - Repeat the investigation’ - Use more than one thistle funnel at each concentration” 3.1.3. - To compare the changes in levels in thistle funnel A and BY 3.1.4 - Since the sugar concentration is higher in AY - This created a steeper concentration gradient” - Allowing for greater movement of water from the beaker into the thistle funnelv - producing a greater rise in level” 3.2 3.2.1 YY 3.2.2 - Has a cell wallv Copyright Reserved - Has a vacuoleY - Has chloroplasts” Any (Mark first TWO only) Cytoplasm”/cytosol (a) cv (b) BY TOTAL SECTION B 2018 Common Test (4) (9) (1) (2) (1) (1) (6) (15) 30 Please turn over Life Sciences ~ Grade 10 SECTION C 4 Marking guideline QUESTION 4 Structure of carbohydrates and proteins - Carbohydrates have elements C, H and OY - They consist of monosaccharides” - Proteins contain the elements C, H, O and NY - Some have S, P and Fev - They are made up of amino acidsY’ Functions of carbohydrates and proteins - Carbohydrates are the source of energyY - They store energy” in the form of starch/glycogen - They form the cell wally’ - Proteins store energyY - They are part of cell membranes¥ - Enzyme/normones are proteinsY Protein test - Make a protein solution” - Add Millon’s reagenty /Biuret test - Heat the solution” in a beaker - Solution turns brick redv//violet - indicating the presence of proteinsv - ifitremains cdear~/blue - then proteins are absent” rivers Effect of fertilizers on the ecosystem - Leads to eutrophication’ March 2018 Common Test Any (3) Any (4) (7) Any (5) - resulting in rapid growth of algae” and other aquatic plants - Algae prevents sunlight” - from reaching plants growing in deeper water” - Prevents photosynthesis” of other water plants - Plants will diew and rot ion bacteria reduce oxyge! - Aquatic animals diev ASSESSING THE PRESENTATION OF THE ESSAY waterY Any (5) Content (17) Synthesis (3) [20] RELEVANCE LOGICAL SEQUENCE COMPREHENSIVE All information provided is Ideas arranged ina logicay | Answered all aspects required by relevant to the topic cause-effect sequence the essay in sufficientdetail | Correct sequence of events in: - Structure and functions of carbohydrates and proteins - The protein test - Effect of fertilisers on ecosystem in rivers All information is relevant: - Structure and functions of carbohydrates and proteins, - The protein test a Effect of fertilisers on ecosystem in rivers There is no irrelevant information Answer contains at least the following: - Structure and functions of carbohydrates and proteins (5I7) - The protein test (3/5) - Effect of fertilisers on ecosystem in rivers (3/5) Amark imark 1 mark Copyright Reserved TOTAL SECTION C: 20 GRAND TOTAL: 60