ACS(I) Y4 Pure Bio 2023 Y4 Exp Common Test

[Turn Over CANDIDATE NAME CLASS PARENT’S SIGNATURE BIOLOGY 6093 21 April 2023, Friday 1 hour 45 minutes READ THESE INSTRUCTIONS FIRST Electronic calculators may be used. Section A There are thirty questions in this section. Answer all questions. For each question, there are four possible answers, A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet. Section B Answer all the questions. The number of marks is given in brackets [ ] at the end of each question or part question. Write your answers in the spaces provided on the Question Paper. 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. You are advised to spend no longer than 30 minutes on Section A and no longer than 1 hour 15 minutes on Section B. This document consists of 19 printed pages, including this cover page. For Examiner’s Use Section A Section B 1 2 3 4 5 TOTAL / 80 COMMON TEST YEAR FOUR EXPRESS

2 6093/Y4Exp/Common Test/April2023 Section A Answer all questions. Record your choice in soft pencil on the separate Answer Sheet 1 The diagram shows a section through a leaf. Which arrow shows the direction of diffusion of carbon dioxide on a sunny day? 2 The graph shows how the rate of photosynthesis of a plant changes with light intensity, at three different carbon dioxide concentrations. In each case the temperature is 15°C. What is the limiting factor for the rate of photosynthesis at point X on the graph? A carbon dioxide concentration B light intensity C surface area of the plant D temperature

3 6093/Y4Exp/Common Test/April2023 [Turn Over 3 The table shows diagrams of three types of cell found in a leaf. Which row correctly identifies each cell type? A spongy mesophyll epidermis xylem B spongy mesophyll xylem epidermis C xylem epidermis spongy mesophyll D xylem spongy mesophyll epidermis 4 Which description of the movement of water through a leaf is not correct? A Water evaporates into an air space from the higher water potential in the cell wall of a mesophyll cell. B Water moves from the higher water potential of the cytoplasm of a mesophyll cell to the lower water potential in its cell wall. C Water moves from the lower water potential of a xylem vessel to the higher water potential of a mesophyll cell. D Water vapour diffuses from an air space, through an open stoma, to the lower humidity of the surrounding air. 5 In an investigation, a leafy shoot was attached to a potometer and exposed to a variety of conditions. The time taken for the meniscus to move 50 mm along the capillary tubing was recorded for each set of conditions. temperature / C humidity air movement time t