Temasek Sec 2024_Prelim_4E_BIO_P3_QP

1 No part of this paper is to be reproduced without the prior approval of the Principal of Temasek Secondary School. Name: Index Number: Class: __________ TEMASEK SECONDARY SCHOOL O Level Preliminary Examination 2024 Secondary 4 Express BIOLOGY 6093/03 Paper 3 Practical Test 1 hour 50 minutes Candidates answer on the Question Paper. Additional Material: Nil READ THESE INSTRUCTIONS FIRST Do not open the booklet until you are told to do so. You are required to submit this booklet at the end of the examination. Write your name, index number and class 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 an HB/2B pencil for any diagrams or graphs. 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, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. Shift Laboratory For Examiner’s Use 1 2 Total /40 This document consists of 12 printed pages.

2 No part of this paper is to be reproduced without the prior approval of the Principal of Temasek Secondary School. 1 You are advised to read the whole question before you start. Plants transport water up along xylem vessels. In this experiment, you are going to compare the upward movement of water in the celery and in a piece of blackboard chalk. You are provided with: • 2 pieces of blackboard chalk • 2 petri dishes • 1 pin • 1 stopwatch • 1 plastic dropper • 1 “stick” of celery stalk (10cm long) • Paper towels • knife • white tile • ruler (15cm) • 60cm3 of coloured water (in beaker) Part 1 Step 1 Pour coloured water into two petri dishes until each is half full. Step 2 Cut the celery stalk into two equal lengths. Stand one half of the stalk vertically onto a dish of coloured water. Step 3 Stand one piece of chalk vertically on the other dish of coloured water as shown in Fig.1.1. Fig.1.1 Step 4 Take it out immediately and make a mark (dot) wit h the pin on the level of coloured water.

3 No part of this paper is to be reproduced without the prior approval of the Principal of Temasek Secondary School. Step 5 Put the chalk back and immediately start the stopwatch. Step 6 At 1 minute, with the chalk still standing in the petri dish, use the pin to make a mark (dot) on the level of the coloured water. Step 7 Continue to record the level of coloured water at 1 minute interval for a duration of 6 minutes. Step 8 Remove the chalk from the dish and dab the base of the ch