LFSC March QP & Memo 2015 Gr10 hlayiso.com

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Downloaded from hlayiso.com Life Sciences NSC ~ Grade 10 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 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. 11. Write neatly and legibly. Copyright Reserved March 2015 Common Test Please Turn Over

Downloaded from hlayiso.com Life Sciences March 2015 Common Test NSC - Grade 10 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 to D) next to the question number (1.1.1 to 1.1.5) in your ANSWER BOOK, for example 1.1.6 D. 4.1.1 Study the diagram below of a microscope. The coarse adjustment and fine adjustment is represented, respectively by ... A. 6 and 9. B. 4and 7. Cc. 1 and 10. D. 9 and 10. 1.1.2 When a pupil observed plant tissue under a microscope, the magnification was x400. Which combination of lenses provided this magnification? 10x eye-piece and a 40x objective 40x eye-piece and a 20x objective 200x eye-piece and a 200x objective 100x eye-piece and a 300x objective GOMWP Copyright Reserved Please Turn Over

Downloaded from hlayiso.co NSC ~ Grade 10 Life Sciences larch 2015 Common Test 1.1.3 Which ONE of the following is an inorganic molecule that provides a fluid medium for chemical reactions? A. Proteins B. Water Cc. Carbon dioxide D. Carbohydrates 1.1.4. Which ONE of the following would you expect to be in larger numbers in a muscle cell as compared to a skin cell? A. Golgi bodies B. Vacuoles. Cc. Mitochondria Dd, Lysosomes 1.1.5 Osmosis is the movement of ... A a solute across a differentially permeable membrane. B. molecules from a region of high concentration to a region of low concentration. Cc water through a differentially permeable membrane. D water molecules from a region of low concentration to a tegion of high concentration. 5 x 2 (10) TOTAL SECTION A: 10 Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Life Sciences March 2015 Common Test NSC = Grade 10 SECTION B QUESTION 2 2.1. Study the line graph below showing the effect of temperature on enzyme activity. Effect of temperature on enzyme activity a » w a \ N Enzyme activty va t T r i 20 30 40 50 60 10 Temperature °C 2.1.1 Identify the independent variable in the above investigation. (1) 2.1.2 At which temperature does the enzyme work the best? (1) ) 2.1.3 Account for the decrease in enzyme activity after the temperature mentioned in QUESTION 2.1.2? (2) 2.1.4 Explain why the enzyme represented in the graph could be from a human? (2) (6) Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Life Sciences March 2015 Common Test NSC — Grade 10 2.2 Grade 10 learners carried out three different food tests to investigate the composition of apple juice, peanuts and beans. The table below shows the results obtained from the investigation. Food types Chemical Reagent Apple juice | Peanuts Beans Millon’s reagent Negative Positive Positive Benedict’s/ Fehling’s A and B Positive Negative | Negative solution Ether/ethanol solution Negative Positive Positive 2.2.1 Which chemical reagent indicates the presence of glucose? (1) ( , 2.2.2 Name any ONE food type that contains fats and proteins. (2) 2.2.3. Which food type will be best for providing energy? (2) (5) 2.3. The following is a list of characteristics related to vitamins: A__ Promotes absorption of calcium B___ Needed for good vision C___ Scurvy (bleeding of gums) D___Beriberi and loss of appetite E___ Deficiency leads to night blindness : F Slows down fat absorption ( Write the LETTER only that applies to each of the following: 2.3.1 TWO characteristics related to vitamin A. (2) 2.3,2 ONE characteristics related to vitamin D. (1) 2.3.3 ONE characteristic related to vitamin C. (1) (4) [15] Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Life Sclences March 2015 Common Test NSC — Grade 10 QUESTION 3 3.1 Study the diagram of a cell below and answer the questions that follow. 3.1.1 Does this diagram represent a plant cell or an animal cell? (1) 3.1.2 Give THREE reasons for your answer to QUESTION 3.1.1. (3) 3.1.3 Write down the NUMBER and NAME of the: (a) System of membranous sacs secreting cellular products. (2) (b) Structure that carries genetic/hereditary information. (2) J (c) Fluid that consists of 90% of water with dissolved substances (2) 3.1.4 Explain what will happen if the structure labelled 11 becomes impermeable. (2) (12) 3.2 State ONE function for each of the following plastids: 3.2.1 Chloroplasts (1) 3.2.2 Chromoplasts (1) 3.2.3 Leucoplasts (1) (3) [15] TOTAL SECTION B: (30) Copyright Reserved Piease Tum Over

Downloaded from hlayiso.com Life Sciences March 2015 Common Test NSC ~ Grade 10 SECTION C QUESTION 4 Give a description of mitosis under the following headings: 4.1. Events during Interphase (2) 4.2 Events of the 4 phases of mitosis (12) 4.3 THREE biological importance of mitosis (3) Content: (17) Synthesis: (3) ( } (20) NOTE: NO marks will be awarded for answers in the form of flow charts or diagrams. TOTAL SECTION C: 20 GRAND TOTAL: 60 Copyright Reserved

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