2021 Sec 4 NA Science Biology

2021 SECONDARY 4 Normal Academic Exam Paper NA Science Biology 1 Admiralty Sec SA2 2 Bukit View Sec SA2 3 Damai Sec SA2 4 Hillgrove Sec SA2 5 Pierce Sec SA2 6 Ping Yi Sec SA2 7 Serangoon Sec SA2 8 Yuying Sec SA2 www.KiasuExamPaper.com 1

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This question paper consists of 6 printed pages including this cover page. ADMIRALTY SECONDARY SCHOOL SUBJECT : Science (Biology) CODE/PAPER : 5107/5 LEVEL/STREAM : Secondary 4 Normal (Academic) DATE : 4 August 2021 TIME : 0800h – 0915h DURATION : 1 hour 15 minutes READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and register number on the Optical Answer Sheet provided unless this has been done for you. There are twenty questions on this paper. Answer all questions. For each question 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 Optical Answer Sheet. Fill in the Optical Answer Sheet very carefully. Answers to Paper 5 and Paper 6 must be handed in separately. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. You are advised to spend no more than 30 minutes on Paper 5. You may proceed to answer Paper 6 as soon as you have completed Paper 5. Any rough working should be done in this question paper. The use of an approved scientific calculator is expected, where appropriate. DO NOT TURN OVER THIS PAPER UNTIL YOU ARE TOLD TO DO SO. PRELIMINARY EXAMINATION 2021 NAME: NO: CLASS: 20 www.KiasuExamPaper.com 3

2 Section A Answer all questions. 1 The table below shows three functions of cells. Which row shows the correct cell for the stated function? absorption support transport A red blood cell muscle cell root hair cell B root hair cell xylem vessel red blood cell C muscle cell root hair cell xylem vessel D xylem vessel root hair cell muscle cell 2 The diagram below shows a single cell organism found in freshwa ter. Which part of the cell shows that it is plant-like? 3 Four identical pieces of potato were treated in two stages as s hown. Which piece of potato will be the most turgid after two hours? Stage 1 Stage 2 A Unboiled Placed in 20% salt solution for two hours B Boiled in water for 10 minutes Placed in 20% salt solution for t wo hours C Unboiled Placed in distilled water for two hours D Boiled in water for 10 minutes Placed in distilled water for two hours A flagellum B cytoplasm C chloroplast D nucleus www.KiasuExamPaper.com 4

3 4 How does oxygen pass from the alveoli to the blood capillaries in the lungs? A active transport B diffusion C evaporation D osmosis 5 A sample of food is crushed with water and tested. The table below shows the results of these tests. test result Benedict’s test yellow precipitate biuret test purple colouration iodine test yellow colour ethanol emulsion test white emulsion Which molecules are present in the food? A glucose, protein and fat only B fat, starch and protein only C protein and fat only D starch and fat only 6 Four test tubes were treated in the following ways as shown in the table. The suspension in the test tubes becomes clear if the protein is digested. Which test tube would the suspension become clear most rapidly? test tube treatment A 2 cm3 of egg protein + 1 cm3 of a gastric juice and kept at 0° C B 2 cm3 of egg protein + 1 cm3 of gastric juice + 1 cm3 of hydrochloric acid and kept at 35° C C 2 cm3 of egg protein + 1 cm3 of gastric juice + 1 cm3 of sodium hydroxide and kept at 35° C D 2 cm3 of egg protein + 1 cm3 of boiled gastric juice + 1 cm3 of hydrochloric acid and kept at 35° C 7 During which stage of mammal’s nutrition do enzymes act on the food? A absorption B digestion C egestion D ingestion www.KiasuExamPaper.com 5

4 8 The diagram below demonstrates the lock and key hypothesis of an enzyme- catalysed reaction. Which letters (M, N and O) represent the lock, key and active site? lock key active site A NM O B MO N C OM N D ON M 9 Where is bile made? A gall bladder B liver C pancreas D stomach 10 A cross-section of a leaf from a land plant reveals many large spaces between the spongy mesophyll cells. Which of the following explains the imp ortance of these spaces? A Allows for rapid diffusion of gases between the leaf and the outside air. B Allows for transport of food substances to other parts of the plant. C Allows more light to be absorbed. D Ensures that the leaf is turgid at all times. 11 Which one of the following statements is not true about a guard cell? A In the presence of light, it becomes turgid to open up the stomata. B It contains chlorophyll. C It is found in the lower epidermis layer. D It takes just one guard cell to create stomata. www.KiasuExamPaper.com 6

5 12 The diagram shows a section of a heart. Which blood vessel(s) associated with the heart contain(s) oxygenated blood? 13 Which blood vessel carries deoxygenated blood from kidney to the heart? A hepatic artery B hepatic vein C renal vein D renal artery 15 Plants make carbohydrates by photosynthesis in the leaves. Thro ugh which structure do carbohydrates move out of the leaves? A I only B II only C III only D I and II only 14 The table shows the rates of water absorption and transpiration of a plant. time 9 am 10 am 11 am 12 pm rate of water absorption / cm3 per hour 15 16 16 17 rate of transpiration / cm3 per hour 7 12 16 19 At what time does the plant show signs of wilting? A 9 am B 10 am C 11 am D 12 pm A chloroplast B mesophyll C phloem D xylem I II III www.KiasuExamPaper.com 7

6 16 Which component of the respiratory system is supported by a C-shaped cartilage? A alveoli B bronchus C larynx D trachea 17 The diagram below shows a section through an alveolus and an associated blood capillary. At which part is the concentration of carbon dioxide the highest? 18 Which parts of a flower are required for fertilization? A carpel and ovule B ovule and pollen C petals and anthers D pollen and sepals 19 Where does implantation of a human embryo usually occur? 20 On which day of the menstrual cycle would an egg most likely be released? End of paper A cervix B fallopian tube C uterus D vagina A Day 1 B Day 7 C Day 14 D Day 28 A B C D Blood capillary wall Direction of blood flow www.KiasuExamPaper.com 8

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This question paper consists of 9 printed pages including this cover page. ADMIRALTY SECONDARY SCHOOL SUBJECT : Science (Biology) CODE/PAPER : 5107/6 LEVEL/STREAM : Secondary 4 Normal (Academic) DATE : 4 August 2021 TIME : 0800h-0915h DURATION : 1 hour 15 minutes READ THESE INSTRUCTIONS FIRST Write your name, class and register number on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams, graphs, tables or rough working. Do not use staples, paper clips, glue or correction fluid. Answer all questions in Section A and any two questions in Section B. The use of an approved scientific calculator is expected, where appropriate. In calculations, you should show all the steps in your working, giving your answer at each stage. You are advised to spend no more than 30 minutes on Paper 5. You may proceed to answer Paper 6 as soon as you have completed Paper 5. At the end of the examination hand in your answers to Paper 5 and Paper 6 separately. The number of marks is given in brackets [ ] at the end of each question or part question. DO NOT TURN OVER THIS PAPER UNTIL YOU ARE TOLD TO DO SO. PRELIMINARY EXAMINATION 2021 For Examiner’s Use Section A /1 4 Section B /1 6 Total /3 0 NAME: NO: CLASS: www.KiasuExamPaper.com 10