ACSI P2 - Y4 Exp Bio Prelim 2024

[Turn Over CANDIDATE NAME CENTRE NUMBER S 2 0 3 1 INDEX NUMBER BIOLOGY 6093/02 Paper 2 Candidates answer on the Question Paper No Additional Materials are required. 12 August 2024, Monday 1 hour 45 minutes READ THESE INSTRUCTIONS FIRST Write your name and index number on all the work you hand in. Write in dark blue or black pen. You may use a pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Section A Answer all questions. Write your answers in the spaces provided on the Question Paper. Section B Answer only ONE question in this section. Write your answers in the spaces provided on the Question Paper. The use of an approved scientific calculator is expected, where appropriate. The number of marks is given in brackets [ ] at the end of each question or part question. This document consists of 21 printed pages, including this cover page. For Examiner’s Use Section A Section B Total / 80 Anglo-Chinese School (Independent) PRELIMINARY EXAMINATION YEAR FOUR EXPRESS

2 6093/02/Y4Exp/Prelim/Aug2024 Section A Answer all questions. Write your answers in the spaces provided. 1 Fig. 1.1 shows blood pressure changes as blood flows through part of the circulatory system, beginning at the right atrium, travelling to the lungs, and ending in the pulmonary vein. Fig. 1.1 (a) Identify the chamber of the heart represented by C. Chamber C ………………………………………………………………………………………[1] (b) Explain the reasons for the regular changes in blood pressure in region D. ……...………………………………………………………………………………….……………… ……...………………………………………………………………………………….……………… ……...………………………………………………………………………………….……………… ……...………………………………………………………………………………….……………… ............................................................................................................................................[2]

3 6093/02/Y4Exp/Prelim/Aug2024 [Turn Over (c) Important exchange of substances take place in the blood as it passes through region E. (i) Identify organ E. ............................................................................................................................................[1] (ii) Identify and describe the exchange of substances that take place. ……...………………………………………………………………………………….……………… ……...………………………………………………………………………………….……………… ……...………………………………………………………………………………….……………… ............................................................................................................................................[2] (ii) State two features of organ E and explain how they help to improve the efficiency of the rate for exchange of substances. Feature 1 ……………………………………………………………………………………………. Explanation …………….…………………………………………………………….……………… ……...………………………………………………………………………………….……………… ……...………………………………………………………………………………….……………… Feature 2 ……………………………………………………………………………………………. Explanation …………….…………………………………………………………….……………… ……...………………………………………………………………………………….……………… ............................................................................................................................................[4] [Total: 10]

4 6093/02/Y4Exp/Prelim/Aug2024 2 The yields of corn grown in open fields in India are low compared to the yields of corn grown in the glasshouses in The Netherlands. In a study, scientists in India grew corn plants in glasshouses and in open fields nearby. The growth of the plants and the yields of the corn were recorded. The results are shown in Table 2.1 Table 2.1 location corn plants grown in glasshouse open field mean final height of corn plants / cm 84.1 68.0 mean number of leaves per corn plant 132.0 83.0 mean fresh mass of corn plants / g 978.5 485.2 mass of corn per plant / g 2853.0 832.4 mean fresh mass of corn / g 98.0 86.5 (a) The mean fresh mass of corn grown in glasshouses was greater than the mean fresh mass of corn grown in open fields. Calculate the difference in mean fresh mass as a percentage of the mean fresh mass of corn grown in open fields. Show your working. Give your final answer to a whole number. ……………………………..% [2]

5 6093/02/Y4Exp/Prelim/Aug2024 [Turn Over (b) Suggest how an increase in the height of the plants and the number of leaves on each plant affect the yield of corn. ……...………………………………………………………………………………….……………… ……...………………………………………………………………………………….……………… ……...………………………………………………………………………………….……………… ……...………………………………………………………………………………….……………… ……...………………………………………………………………………………….……………… ............................................................................................................................................[3] (c) The scientists ensured that the only differences between the two groups of plants were the result of the protection provided by the glasshouses. Suggest two factors that the scientists should have kept constant for the two groups of plants in this investigation. ……...………………………………………………………………………………….……………… ……...………………………………………………………………………………….……………… ……...………………………………………………………………………………….……………… ............................................................................................................................................[2] (d) The growth and final yields of crops grown in open fields are often limited by environmental factors. Describe how these factors are controlled in a commercial glasshouse to give high yields of crops such as corn. ……...………………………………………………………………………………….……………… ……...………………………………………………………………………………….……………… ……...………………………………………………………………………………….……………… ……...………………………………………………………………………………….……………… ............................................................................................................................................[3] [Total: 10]

6 6093/02/Y4Exp/Prelim/Aug2024 3 Fig. 3.1 shows a vertical section through the skin in two different environmental conditions, A and B. Fig. 3.1 (a) On Fig. 3.1 under condition A, label each of the following: • A sweat gland • An arteriole. [2] (b) Using the information in Fig . 3.1, suggest how environmental condition B is different from environmental condition A. ……...………………………………………………………………………………….……………… ............................................................................................................................................[1] (c) With reference to Fig . 3 .1, state and explain two differences between the skin in environmental condition A and the skin in environmental condition B. 1…...…………………………………………………………………………………………………... ……...………………………………………………………………………………….……………… ……...………………………………………………………………………………….……………… 2…...…………………………………………………………………………………………………... ……...………………………………………………………………………………….……………… ............................................................................................................................................[4]

7 6093/02/Y4Exp/Prelim/Aug2024 [Turn Over (d) (i) State the change in the level of anti-diuretic hormone (ADH) in a person if the person is to stay in environmental condition B for a period of time without access to drinking water. ……...………………………………………………………………………………….……………… ............................................................................................................................................[1] (ii) Explain how the change in ADH level stated in (d)(i) affects the urine production of the person. ……...………………………………………………………………………………….……………… ……...………………………………………………………………………………….……………… ……...………………………………………………………………………………….……………… .................