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 taken to move 50 mm /s 20 dry not moving 125 20 dry moving 71 30 dry not moving 40 20 humid not moving 166 20 humid moving 83 30 humid not moving 55 Which row shows the slowest and fastest rates of water uptake for this investigation? slowest rate / mm s-1 fastest rate / mm s-1 A 0.3 1.3 B 0.3 3.3 C 3.3 0.3 D 1.3 0.8

4 6093/Y4Exp/Common Test/April2023 6 A region of a plant containing the vascular tissue is treated with a metabolic poison. How will this treatment affect the transport between roots and leaves via xylem and phloem? xylem phloem A ✓ ✓ key ✓ = transport continues  = transport stops B ✓  C  ✓ D   7 The diagrams show four components of blood. Which component produces antibodies? 8 At one point in the cardiac cycle, the pressure in the right ventricle is lower than that in the right atrium and lower than that in the pulmonary artery. Which row is correct? atrioventricular valve semilunar valve A closed closed B closed open C open closed D open open 9 The diagram illustrates changes in air pressure taking place inside the lungs during a complete cycle of breathing. Which position on the graph corresponds to the point at which the ribs are beginning to be lowered?

5 6093/Y4Exp/Common Test/April2023 [Turn Over 10 What is the equation for aerobic respiration? A C6H12O6 + 6O2 → 6CO2 + 6H2O B C6H12O6 → 2C3H6O3 C C6H12O6 → 2C2H5OH + 2CO2 D 6CO2 + 6H2O → C6H12O6 + 6O2 11 The diagram shows some of the structures in a human lung. Where is the carbon dioxide concentration highest? 12 Which feature of the human gas exchange system helps to maintain a steep diffusion gradient for gas exchange? A A large number of alveoli are present in each lung. B Alveoli walls contain elastic fibres allowing expansion. C The air brought into the alveoli by ventilation is high in oxygen. D The endothelium of the capillary wall is made of flattened cells. 13 Lactic acid builds up in the muscles during vigorous exercise. During recovery, how is this lactic acid removed? A aerobic respiration of lactic acid in the liver B anaerobic respiration of lactic acid in the muscles C excretion of lactic acid by the kidneys D removal of lactic acid by the alimentary canal

6 6093/Y4Exp/Common Test/April2023 14 What are short-term effects of nicotine on the cardiovascular system? 1 constriction of small arteries 2 increase in heart rate 3 increase in blood pressure A 1, 2 and 3 B 1 and 2 C 1 and 3 D 2 and 3 15 In a kidney machine, protein molecules are not lost from the blood. How is loss of protein prevented? A Membranes prevent protein molecules diffusing out of the blood. B Proteins are actively transported back into the blood. C Proteins do not enter the kidney machine. D The dialysis fluid contains protein, so there is no diffusion gradient. 16 Which organs remove excretory products from the blood? A bladder and liver B bladder and lungs C kidneys and bladder D lungs and kidneys 17 The diagram shows a section through human skin. What are the structures labelled X, Y and Z? X Y Z A receptor sweat gland hair erector muscle B receptor hair erector muscle sweat gland C sweat gland receptor hair erector muscle D sweat gland hair erector muscle receptor

7 6093/Y4Exp/Common Test/April2023 [Turn Over 18 What would be the effects of vasodilation and sweating on the body temperature and on the amount of moisture on the surface of the skin? body temperature moisture on skin surface A decreased decreased B decreased increased C increased decreased D increased increased 19 What is not an example of a simple reflex action? A blinking when sand blows in your eyes B jumping when hearing a loud noise C removing your hand from a hot object D steering a car to avoid hitting something 20 Hormones and the nervous system both control our bodies. Which statement about the control provided by our hormones is correct? A fast response and long lasting B fast response and short lived C slow response and long lasting D slow response and short lived 21 The flow chart describes a reflex action. Which row correctly fills the flow chart? E F G H I A effector relay motor sensory brain B effector sensory relay motor receptor C receptor sensory motor relay effector D receptor motor sensory relay brain

8 6093/Y4Exp/Common Test/April2023 22 The diagram shows a section through part of the human eye. Which part contains muscles? 23 The diagram shows the curvature of the lens in a person’s eye. The shape of the lens changes as the person watches two motorbikes go past at different speeds. During which period was a motorbike moving away from the person at the higher speed? 24 Wh