Sec 4 Science Biology SA2 2018 Geylang Meth QP

Geylang Methodist School (Secondary) Preliminary Examination 2018 SCIENCE (CHEMISTRY/BIOLOGY) Paper 1 5078/1 Sec 4E/5N Additional materials : Optical Answer sheet (OAS) 1 hour Setter : Iskandar 18 Aug 2018 Ms Lam Yuit Kwai READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correcti on fluid on the Optical Answer Sheet. Write your name, class and index number on the Optical Answer Sheet provided. There are forty questions in this paper. Answer all the questions. For each que stion, there are four possible answers, A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate answer sheet. Read the instructions on the answer sheet very carefully. Each correct answer will score one mark. No mark will be deducted for a wrong answer. Any rough work should be done in this booklet. A copy of the periodic table is printed on page 24. This document consists of 13 printed pages. [Turn overwww.KiasuExamPaper.com 160

GMS(S)/Sc(BY/CY)/P1/MYE/2018/4E5N2 Section A 21 The diagram shows a section through a leaf. Which of the following correctly identifies an organ and a tissue? organ tissue A P R B Q S C R P D S Q www.KiasuExamPaper.com 161

GMS(S)/Sc(BY/CY)/P1/MYE/2018/4E5N3 22 The diagram shows some chemical molecules found in the human body and how they join to form larger molecules. Which of the following correctly identifies molecules K, L, M and N? K L M N A amino acid glycerol fat glucose B protein glycerol fatty acid starch C maltose fat glycerol cellulose D fatty acid amino acid starch glucose 23 The diagram illustrates the ‘lock and key’ hypothesis of enzyme action. Which of the following correctly identifies the enzyme, the active site and the substrate? enzyme active site substrate A 1 2 3 B 1 3 2 C 3 1 2 D 3 2 1 www.KiasuExamPaper.com 162

GMS(S)/Sc(BY/CY)/P1/MYE/2018/4E5N4 24 Pepsin is an enzyme that is active in the human stomach. Which graph shows how the rate of reaction of pepsin is affected by pH? 25 Which bar chart represents the amount of starch digested in the mouth, stomach and ileum of a human? A A DC B B C D www.KiasuExamPaper.com 163

GMS(S)/Sc(BY/CY)/P1/MYE/2018/4E5N5 26 The diagram shows part of the human alimentary canal. Which two structures produce substances involved in the digestion of fat? A 1 and 4 B 3 and 5 C 2 and 3 D 4 and 5 27 A plant is kept in the dark for two days. A leaf is used in an experiment to investigate the effect of two factors on photosynthesis, as shown in the diagram. What are the colours of Q and R, when the leaf is tested for starch? Q R A brown brown B brown blue-black C blue-black brown D blue-black blue-black www.KiasuExamPaper.com 164

GMS(S)/Sc(BY/CY)/P1/MYE/2018/4E5N6 28 The diagram shows the right-hand side of the human heart when t he ventricle is relaxed. Which row correctly describes the position of the valves X and Y when the ventricle contracts? valve at X valve at Y A closed closed B closed open C open closed D open open 29 A shoot is placed in a beaker of red coloured water for 3 hours. The diagrams show transverse sections of a leaf and stem of the shoot. Which regions, 1– 4, will be stained red after three hours? A 1 and 2 B 2 and 4 C 1 and 4 D 2 and 3 leaf stem www.KiasuExamPaper.com 165

GMS(S)/Sc(BY/CY)/P1/MYE/2018/4E5N7 30 An experiment is set up as shown. Test -tubes 1 and 2 contain limewater. Limewater is a clear solution tha t turns cloudy in the presence of carbon dioxide. Air is pumped through the apparatus. What is the appearance of the limewater in test-tubes 1 and 2 after a period of ten minutes? test-tube 1 test-tube 2 A clear clear B clear cloudy C cloudy clear D cloudy cloudy 31 The diagram shows a section through part of the eye. What happens to parts X, Y and Z when the eye focuses on a near object? X Y Z A contracts tight less convex B contracts slack more convex C relaxes tight less convex D relaxes slack more convex www.KiasuExamPaper.com 166

GMS(S)/Sc(BY/CY)/P1/MYE/2018/4E5N8 32 The diagram shows a simple knee-jerk reflex. What is the correct order of events after the knee is tapped? A 1 Æ 2 Æ 3 Æ 4 B 1 Æ 4 Æ 2 Æ 3 C 4 Æ 2 Æ 1 Æ 3 D 4 Æ 3 Æ 2 Æ 1 www.KiasuExamPaper.com 167

GMS(S)/Sc(BY/CY)/P1/MYE/2018/4E5N9 33 The graph shows changes in the glucose concentration in the blood of a person during two hours. What explains the shape of the graph after X? A The person has eaten a jam sandwich. B The person has had an insulin injection. C The person is running a marathon. D The person is suffering from a condition in which insulin is lacking. 34 The diagram shows the stigma, style and ovary of a flower. Where does fertilisation take place? www.KiasuExamPaper.com 168

GMS(S)/Sc(BY/CY)/P1/MYE/2018/4E5N10 35 The diagram shows a plant that is producing small plantlets. Which statement about the plantlets is correct? A They are genetically identical to the parent plant. B They are genetically different from the parent plant. C They are produced by seeds formed in the fruit while attached to the plant. D They are produced as a result of the fusion of nuclei. 36 The diagram shows part of the human male reproductive system. What are the structures P, Q and R? P Q R A sperm duct urethra testis B sperm duct testis urethra C urethra testis sperm duct D urethra sperm duct testis P Q R www.KiasuExamPaper.com 169