ACJC 2024 H2 Biology P4 Prelim (A)

This document consists of 19 printed pages. [Turn over Anglo-Chinese Junior College JC2 Biology Preliminary Examination Higher 2 CANDIDATE NAME FORM CLASS TUTORIAL CLASS INDEX NUMBER BIOLOGY Paper 4 Practical Candidates answer on the Question Paper. Additional Materials: As listed in the Confidential Instructions. 9744/04 06 August 2024 2 hours 30 minutes READ THESE INSTRUCTIONS FIRST Write your Name, Class and Index number in the spaces 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 pencil for any diagrams or graphs. Do not use staples, paper clips, 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, 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 Examiners’ use 1 / 12 2 / 23 3 / 20 Total / 55

2 Anglo-Chinese Junior College H2 9744 Paper 4 Preliminary Examination For Examiner Use Answer all questions. 1 In some countries, certain plants have seasonal growth. During the summer plants transport sucrose from the leaves to store it as starch in the roots. Table 1.1 summarises the changes in the leaves and roots during the year. Table 1.1 season leaves roots summer leaves synthesise sucrose sucrose stored as starch winter no leaves starch stored spring leaves growing starch converted to glucose You are required to identify the source of four plant extracts. These have been taken from • a root in winter • a root in spring • phloem sap from the stem in summer • phloem sap from the stem in winter (a) Use the information in Table 1.1 to predict which substances you would expect to be present in each of the four plant extracts, then complete Table 1.2. Key: ✓ (tick) substance present in plant extract ✗ (cross) substance absent from plant extract Table 1.2 source of plant extract substances present in each of the plant extracts starch sucrose glucose root in winter ✓ ✗ ✗ root in spring ✓ or ✗ ✗ ✓ phloem sap from the stem in summer ✗ ✓ ✗ phloem sap from the stem in winter ✗ ✗ ✗ [2] 1m for first two rows, 1m for last two rows;

3 [Turn over Anglo-Chinese Junior College H2 9744 Paper 4 Preliminary Examination For Examiner Use One sample was ta