2023 RI H2 Bio Prelim P4 Questions

©RI 2023 Preliminary Examination 9744/04 [Turn over RAFFLES INSTITUTION 2023 Year 6 Preliminary Examination Higher 2 BIOLOGY 9744/04 Paper 4 Practical 14th August 2023 2 hours 30 minutes Candidates answer on the Question Paper. Additional Materials: As listed in the Confidential Instructions. READ THESE INSTRUCTIONS FIRST Write your index number, CT group and name on all the work you hand in. Give details of the practical shift and laboratory, where appropriate, in the boxes provided. Write in dark blue or black pen. You may use a 2B pencil for any diagrams or graphs. Do not use staples, paper clips, highlighters, glue or correction fluid. Answer all questions in the spaces provided on the Question Paper. The use of an approved scientific calculator is expected, where appropriate. You may lose marks if you do not show your working or if you do not use appropriate units. At the end of the examination, hand in the Question Paper containing your answers. The number of marks is given in brackets [ ] at the end of each question or part of the question. This document consists of 19 printed pages and 1 blank page. CIVICS GROUP CANDIDATE NAME INDEX NUMBER 3 S 0 3 2 For Examiner’s Use 1 2 3 Total Shift Laboratory Raffles Institution Internal Examination

2 ©RI 2023 Preliminary Examination 9744/04 For Examiner’s Use Answer all questions. 1 The kidneys are the organs that remove waste products from the blood and produce urine. Urine can be tested as part of a health check. People who have kidney disease or a urinary tract infection may have unusually high concentrations of protein in their urine. You will be testing a solution that represents a sample of urine from a patient with a possible kidney disease or a urinary tract infection and will be referred to as ‘mock urine’. You will determine the concentration of protein in this sample of mock urine. You are provided with the materials shown in Table 1.1. Table 1.1 labelled contents hazard volume / cm3 P 10.00% protein solution none 20 W distilled water none 50 C 0.15% copper sulfate solution harmful irritant 20 K 5.00% potassium hydroxide solution harmful irritant 20 U mock urine none 10 X unknown none 10 U+X mixture of U and X none 10 You are requir