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 fa