2021_CGSS_Bio_Prelim_P3

CEDAR GIRLS’ SECONDARY SCHOOL End of Year Examination 2021 Year 4 CANDIDATE NAME CLASS 4 INDEX NUMBER BIOLOGY 6093/03 Paper 3 Practical Test 18 August 2021 1hour 50 minutes Additional Materials: As listed in the Confidential Instructions READ THESE INSTRUCTIONS FIRST Write your name and index number clearly in the spaces at the top of this page. 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. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use 1 2 Total Shift Laboratory This document consists of 12 printed pages. [Turn over

2 For Examiner's Use 1 You are advised to read the whole question before you start. Glucose formed from hydrolysis of carbohydrates is absorbed at certain parts of the alimentary canal. You will be investigating the movement of glucose solution. You are provided with:  20% glucose solution labelled G  distilled water  a 5cm3 syringe  four plastic droppers  a 50cm3 measuring cylinder  four boiling tubes  four test tubes  a rubber bung to fit a boiling tube  a 250 cm3 beaker labelled water bath  a stopwatch The apparatus that you will set up is shown in Fig. 1.1, using a boiling tube and a 5 cm3 syringe. Fig. 1.1 Step 1 Label the four boiling tubes as G4, G8, G12 and G16. Step 2 Put an empty 5 cm3 syringe into the boiling tube G4 as shown in Fig. 1.1. plunger of syringe barrel of syringe boiling tube mark nozzle of syringe

3 [Turn over For Examiner's Use Step 3 Using the marker provided, draw a mark on the boiling tube labelled G4, as shown in Fig. 1.1, so that the mark is level with the top of the nozzle of the syringe. (a) (i) Describe how you will use the apparatus provided to find the volume of distilled water needed to fill the boiling tube up to the mark. [2] (ii) Find the volume of distilled water needed to fill the boiling tube up to the mark, using the method you described in (a)(i). volume = cm3 [1] Step 4 Put the volume of distilled water stated in (a)(ii) into each of the four boiling tubes G4, G8, G12 and G16. Step 5 Fill a 5 cm3 syringe with slightly more than 5 cm3 of glucose solution, G. Push the plunger in until it reaches the 5 cm3 mark. This adjustment is done to ensure that there are no air bubbles in the