YCKSS Pure Biology Prelim 2024 Paper 1

Name: Index Number: Class: YIO CHU KANG SECONDARY SCHOOL PRELIMINARY EXAMINATION 2024 SECONDARY FOUR EXPRESS BIOLOGY 6093/01 Paper 1 1 hour Additional Materials: 9 September 2024 (Monday) Optical Answer Sheet (OAS) READ THESE INSTRUCTIONS FIRST Write in soft pencil on the OAS. Do not use staples, paper clips, glue or correction fluid. Write your name, index number and class on the OAS in the spaces provided. There are forty questions on this paper. 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 OAS. Read the instructions on the OAS very carefully. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this question paper. The use of an approved scientific calculator is expected, where appropriate. For Examiner’s Use 40 Setter: Mr Wong Mingwei This document consists of 20 printed pages.

2 4E PRELIMINARY EXAM 2024 6093/01 1 The electron micrograph shows some cells from a plant. Which cell structure is not usually found in cells from a root? 2 The diagram shows three circles, 1, 3 and 5, and the shared structures, 2 and 4. Which row correctly identifies the three circles and some of the structures that are shared between them? circle 1 2 circle 3 4 circle 5 A muscle cell no nucleus red blood cell mitochondria xylem vessel B muscle cell cytoplasm xylem vessel cell membrane red blood cell C red blood cell cell membrane muscle cell chloroplast xylem vessel D xylem vessel no nucleus red blood cell cell membrane muscle cell 3 What happens to the surface area to volume ratio of a cube when the length of each side is doubled? A The ratio decreases by four times. B The ratio halves. C The ratio doubles. D The ratio increases by four times. A B C D circle 1 circle 3 2 circle 5 2 4

3 4E PRELIMINARY EXAM 2024 6093/01 4 Which row identifies how ions and molecules move by active transport? against concentration gradient down concentration gradient through a membrane requiring energy A ✓  ✓ ✓ B ✓  ✓  C  ✓   D  ✓ ✓ ✓ 5 Some health problems can be detected using chemical tests for protein and glucose in the urine. Which row shows the results for a person with protein and glucose in their urine? Benedict’s solution biuret reagent ethanol iodine solution A blue blue white emulsion brown B blue violet colourless blue-black C red blue white emulsion blue-black D red violet colourless brown 6 Which region on the graph shows the activation energy of an enzyme-catalysed reaction? time B A C D without enzyme with enzyme

4 4E PRELIMINARY EXAM 2024 6093/01 7 These diagrams show the interaction between an enzyme molecule and a substrate molecule. The diagrams were listed by number. event 1 event 2 event 3 Four students were asked to match the descriptions to the diagrams. The descriptions were listed by letter. V A chemical reaction occurred, and the substrate is broken down into its products. W Active site of enzyme is unoccupied, and substrate can fit in. X An enzyme-substrate complex is formed. Y Enzyme remained chemically unchanged at the end of the reaction. Z Only substrates complementary to the active site of the enzyme can fit in. Which student correctly matched the event to the descriptions to the diagram? event 1 event 2 event 3 A V W and Z X and Y B W X and Y V and Z C X V and Y W and Z D Z V and W X and Y 8 The solid line on the graph represents the amount of products formed over time for a reaction in a cell. Which other line represents the effect of adding the enzyme for this reaction? time total products formed A B D C

5 4E PRELIMINARY EXAM 2024 6093/01 9 The diagram shows the digestive system. Which part absorbs the most water? 10 The diagram shows a villus. The arrows show the direction of flow within vessels associated with the villus. Which of the following correctly compared the concentration of substances transported in the vessels? concentration of glucose concentration of amino acids concentration of fats A highest in 2 and 3 highest in 1 lowest in 1 and 4 B highest in 4 lowest in 1 highest in 2 C lowest in 1 highest in 2 lowest in 2 D lowest in 2 and 3 highest in 4 highest in 3 1 2 3 4 A B C D

6 4E PRELIMINARY EXAM 2024 6093/01 11 The graph shows the thickness of the muscular wall in each of the four chambers of the mammalian heart. Which chamber is the right ventricle? A B C D chamber 12 The diagrams show sections through three types of blood vessel. They are not drawn to the same scale. 1 2 3 Which of the following descriptions best represents the blood vessels? blood vessel 1 blood vessel 2 blood vessel 3 A allows exchange of substances most contains valves can undergo vasodilation B can undergo vasodilation allows exchange of substances most contains valves C can withstand high blood pressure most contains valves allows exchange of substances D most contains valves can undergo vasodilation allows exchange of substances thickness

7 4E PRELIMINARY EXAM 2024 6093/01 13 The diagram gives information about blood pressure in the left side of the heart during the cardiac cycle. 0 0.1 0.2 0.3 0.4 0.5 0.6 Valves open and close at the points numbered. Which row identifies the valves opening or closing at the points numbered? bicuspid valve opens semilunar valve open bicuspid valve close semilunar valve close A 1 3 4 2 B 2 4 3 1 C 3 1 2 4 D 4 2 1 3 14 During inspiration, the processes listed take place. P volume of the thorax increases Q air rushes into the lungs R pressure in the thorax decreases S external intercostal muscles contract T diaphragm moves down, ribs move upwards and outwards What is the correct sequence for these processes? A Q → P → S → R → T B S → T → P → R → Q C Q → P → S → T → R D S → Q → R → P → T pressure /kPa 1 2 3 4 key aorta atrium ventricle

8 4E PRELIMINARY EXAM 2024 6093/01 15 The graph shows the changes in lung volume during breathing when a person was at rest and then when they began to exercise. From resting to exercise, the volume of air breathed in at each breath increased from ......x...... dm3 to ......y...... dm3. Looking at the graph, which numbers correctly complete the gaps in the sentence? x y A 0.5 3.0 B 0.5 5.0 C 2.0 5.0 D 5.0 2.0 16 Which row shows where glucose will be found in the body of a healthy human after eating a meal? renal artery renal vein glomerulus nephron ureter A no yes no no yes B yes no yes yes yes C yes yes no no no D yes yes yes yes no