Secondary 4E Science Biology 2024

2024 SECONDARY 4 G3 Express Exam Paper G3 Science Biology (Paper 1 & 4) 1 Assumption Eng Prelim 2 Beatty Sec Prelim 3 Geylang Meth Prelim 4 Serangoon Sec Prelim 5 Yio Chu Kang Prelim 6 Yishun Sec Prelim pe www.KiasuExamPaper.com 1

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Name: ............................................................. ( ) Class: ................. This Question Paper consists of 10 printed pages including this page. [Turn over ASSUMPTION ENGLISH SCHOOL PRELIMINARY EXAMINATION 2024 SCI ENCE (BIOLOGY) 5088 / 01 ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL LEVEL: Sec 4 Express DATE: 28 August 2024 CLASSES: Sec 4/2 & 4/3 DURATION: 1 hour (for both Science components) Additional Materials provided: 1 sheet of OAS paper INSTRUCTIONS TO CANDIDATES Do not open this booklet until you are told to do so. Wri te your NAME, INDEX NUMBER and CLASS at the top of this page and on the OAS paper. This paper consists of 1 section. There ar e 20 questions in this section. Answer all questions. For each question, there are four possible answers A, B, C and D. Choose the correct answer and record your choice in soft or 2B pencil on the OAS paper provided. DO NOT fold or bend the OAS paper. At the end of the examination, hand in your OAS paper and question booklet separately. www.KiasuExamPaper.com 3

2 5088/01/4E/PRELIMS/24 MULTIPLE-CHOICE QUESTIONS [20 marks] For each question, there are four possible answers A, B, C and D. Choose the one you consider correct and record your choice in the OAS paper provided. 1 The diagram shows an organism called Euglena. Euglena is a single -celled organism that can photosynthesise. Which label points to the structure that enables it to photosynthesise? 2 The diagram shows an experiment. Why has the starch suspension changed colour? A Iodine has diffused in through the membrane. B Iodine has diffused out through the membrane. C Starch has diffused in through the membrane. D Starch has diffused out through the membrane. A B C D start of experiment end of experiment 6 hours starch suspension (white) Visking tubing beaker iodine solution starch suspension (blue-black) www.KiasuExamPaper.com 4

3 5088/01/4E/PRELIMS/24 [Turn Over 3 Which substance is the basic unit that forms glycogen? A amino acids B fatty acids C glucose D glycerol 4 Which of the following is/are functions of proteins? 1 provide thermal insulation 2 repair of tissues 3 serve as biological catalyst to speed up reactions 4 transport of water A 1 and 2 only B 2 and 3 only C 2 and 4 only D All of the above 5 An unknown food sample was tested and the following results were obtained. • A white emulsion when mixed with ethanol and water. • A violet colour in the biuret test. • A blue colouration was observed when heated with Benedict’s solution. • A yellowish brown colour with iodine. What does the food sample contain? A The sample contains fats and proteins. B The sample contains fats and starch. C The sample contains proteins only. D The sample contains starch only. 6 Starch is digested to maltose by the enzyme amylase. According to the ‘lock-and-key’ hypothesis, which option correctly identifies the ‘lock’ and the ‘key’? ‘lock’ ‘key’ A amylase maltose B amylase starch C starch amylase D starch maltose www.KiasuExamPaper.com 5

4 5088/01/4E/PRELIMS/24 7 The table below shows the characteristics of the blood flowing through a blood vessel in the body. concentration of oxygen high concentration of carbon dioxide low blood pressure high Which blood vessel has these characteristics? A aorta B pulmonary artery C pulmonary vein D vena cava 8 The diagram shows a section through the human heart. Which feature suggests that blood leaves the heart at different pressures, when going to the lungs and to the body? A Chambers R and S have different volumes. B The walls of the atria are thinner than the walls of the ventricles. C Valve P is stronger than valve Q. D Wall T is more muscular than wall U. P U Q R S T www.KiasuExamPaper.com 6

5 5088/01/4E/PRELIMS/24 [Turn Over 9 Four test-tubes with hydrogen carbonate indicator solution are set up as shown below. Hydrogen carbonate indicator solution stays red if there is no change in carbon dioxide concentration. The indicator turns yellow if the carbon dioxide concentration increases and purple if the carbon dioxide concentration decreases. After 10 minutes, the indicator in one of the test-tubes turned purple. Which test-tube turned purple? 10 Which option indicates a common mode of transmission for the diseases? disease mode of transmission 1 coronary heart disease direct contact 2 HIV malnutrition 3 influenza respiratory droplets 4 pneumococcal disease contaminated food and water A 1 and 2 only B 2 and 3 only C 3 and 4 only D All of the above A B C D www.KiasuExamPaper.com 7

6 5088/01/4E/PRELIMS/24 11 The diagram shows a food web. Which organisms occupy the same trophic level? A 1 and 4 B 2 and 3 C 2 and 5 D 3 and 5 12 The diagram shows four ecological pyramids. In a food chain, grass is eaten by cows. The cows have insects living on their skin. The insects are eaten by birds. Which row shows the pyramid of biomass and pyramid of numbers in this food chain? pyramid of biomass pyramid of numbers A 1 3 B 1 4 C 3 1 D 3 2 1 2 3 4 www.KiasuExamPaper.com 8

7 5088/01/4E/PRELIMS/24 [Turn Over 13 Which statement about carbon sinks is correct? A All carbon sinks are fossil fuels. B Carbon sinks emit more carbon dioxide than they absorb. C Carbon sinks remove carbon dioxide permanently from the atmosphere. D Increasing carbon sinks could reduce global warming. 14 The same number of cells from regions P to S were isolated from a green leaf, placed in a solution of 1.5% sodium hydrogencarbonate and exposed to the same light intensity. Sodium hydrogencarbonate releases carbon dioxide in solution. Gas released by each group of cells in 30 minutes was collected and tested. Which group(s) of cells released oxygen gas? A P and R B P and S C Q only D Q, R and S P Q R S www.KiasuExamPaper.com 9

8 5088/01/4E/PRELIMS/24 15 The graph shows the rate of photosynthesis in a plant exposed to normal atmospheric conditions but different light intensities. At which part of the graph did carbon dioxide concentration become a limiting factor? 16 Which diagram shows the structure of two nucleotides in a DNA molecule? A B C D key sugar phosphate base rate of photosynthesis light intensity A B C D www.KiasuExamPaper.com 10