Dunman 2026 6093 P1 prelims QP

This document consists of 23 printed pages. DUNMAN SECONDARY SCHOOL CANDIDATE NAME CLASS INDEX NUMBER PRELIMINARY EXAMINATION 2026 SECONDARY 4 EXPRESS BIOLOGY 6093/01 Paper 1 1 September 2026 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and index number on the Answer Sheet in the spaces provided unless this has been done for you. There are forty questions on this paper. Answer all questions. For each questions 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. Read the instructions on the Answer Sheet 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 booklet. The use of an approved scientific calculator is expected, where appropriate.

2 6093/01/Prelim/4Exp/2026 1 Some cell structures are listed in a particular order. 1 nucleus 2 ribosome 3 Golgi body 4 vesicle What does the order represent? A sequence used in the synthesis of a lipid B sequence used in the synthesis of an antibody C size from largest to smallest D size from smallest to largest 2 The electron micrograph shows part of a plant cell. Which row correctly identifies the cell organelles? P Q R A cell membrane cytoplasm mitochondrion B cell membrane vacuole chloroplast C cell wall cytoplasm mitochondrion D cell wall vacuole chloroplast P Q R nucleolus

3 6093/01/Prelim/4Exp/2026 3 The graph shows how the rate of entry of glucose into a cell changes as the concentration of glucose outside the cell changes. Which statement is correct to describe the plateau at point X? A Glucose is transported via diffusion only. B Glucose is transported via active transport only. C The cell has used up its supply of energy. D The concentration of glucose in and outside of the cell are equal. 4 Some processes which occur in flowering plants are listed. 1 ion uptake by roots hair cells 2 movement of mineral ions up the xylem in the stem 3 water uptake by root hairs cells 4 water vapour loss by the mesophyll cells of the leaves Which process(es) is/ are controlled by cell surface membranes? A 1 only B 1 and 3 C 2 only D 2, 3 and 4 X rate of entry of glucose into the cell concentration of glucose outside the cell

4 6093/01/Prelim/4Exp/2026 5 The diagrams show the structure of an amino acid with some parts of the molecule shaded. Which diagram shows the shaded part of the molecule that is common to all amino acids? A B C D 6 A solution of amylase was added to a suspension of starch. After 30 seconds, three samples of the mixture were tested with iodine solution, Benedict’s solution and biuret reagent. Which row correctly identifies the resulting colours when tested with each reagent? colour with test reagent iodine Benedict’s biuret A black blue purple B black red blue C brown green blue D brown orange purple NH2 H H COOH CH3

5 6093/01/Prelim/4Exp/2026 7 Which graph represents the relationship between temperature and the rate of enzyme activity in bacteria which grows optimally at temperatures between 80 °C and 110 °C? 8 A plant was exposed to two different concentrations of carbon dioxide. The rate of oxygen production at increasing light intensities was measured. The results were plotted on the graph shown. Which statement cannot be concluded from the graph? A At light intensity of 25 a.u, the amount of starch present in curve X is higher than in curve Y. B Curve X was obtained from the plant being placed in a higher concentration of carbon dioxide than in curve Y. C Light intensity is a limiting factor after 50 a.u in both curves. D When the light intensity increases from 0 to 25 a.u, the rate of photosynthesis increases in both curves. A B C D X Y 100 light intensity/ a.u 0 75 25 50 0 1 2 3 4 5 6 7 rate of oxygen production per hour / a.u 0 0 0 0 100 100 100 100

6 6093/01/Prelim/4Exp/2026 9 Which of the following statements describe(s) the use of lipids? 1 It acts as a heat insulating layer for organs. 2 It has shock-absorbing properties in blood vessels. 3 It is storage for food reserves A 1 only B 1 and 2 only C 1 and 3 only D 2 and 3 only 10 When 1 cm3 of human bile was added to 5 cm 3 of milk in a test tube which also contained a few drops of universal indicator solution, the colour change indicated an increase in pH. Which of the following accounts for the change in pH? A Bile contains alkaline salts. B Bile emulsifies fats giving them a larger surface area for digestion to occur. C Bile has a high optimum pH. D Bile hydrolyses fats and releases fatty acids. 11 The pressure of blood flowing through the heart changes during the cardiac cycle. The table shows some values for the pressure in the chambers of the right side of the heart and the pulmonary artery. Which row shows the correct values when the atrioventricular valves are opened and the semilunar valves are closed? pressure in right atrium / mmHg pressure in right ventricle / mmHg pressure in pulmonary artery / mmHg A 2 25 25 B 8 5 25 C 2 25 5 D 8 5 5

7 6093/01/Prelim/4Exp/2026 12 The diagram shows a part of the human circulatory system. In which vessel is the breakdown products of alcohol first found? 13 The table shows features of the blood of four people. Whose blood will fail to form a clot when there is a cut? person platelet count / per mm³ fibrinogen in plasma red blood cell count A 250 000 present normal B 250 000 absent normal C 250 000 present low D 60 000 present normal

8 6093/01/Prelim/4Exp/2026 14 What happens during the process of breathing in? diaphragm muscle external intercostal muscles pressure in the lungs volume of thorax A flattens contract decrease decrease B move upwards relax increase decrease C relaxes relax decrease decrease D contracts contract decrease increase 15 The graph shows the volume of air breathed out quickly and with force, following a deep breath in, for three different people, X, Y and Z. What row shows a possible explanation for the differences in the volume of air breathed out by X, Y and Z? chronic bronchitis emphysema normal lung function A X Z Y B Y X Z C Y Z X D Z Y X X Y Z volume of air breathed out/ dm3 time/ s

9 6093/01/Prelim/4Exp/2026 16 Which feature maintains a steep concentration gradient of oxygen between the air in the alveoli and the blood in the surrounding capillaries? A the flow of blood through the lungs B the presence of haemoglobin in the blood cells C the single-celled wall of the alveoli D the epithelium of capillaries 17 The line graphs show the relative concentration of glucose, protein and urea in the fluids obtained from various parts of the mammalian kidney. Which of the following correctly matches the three graphs? I II III A protein urea glucose B glucose urea protein C glucose protein urea D protein glucose urea relative concentration glomerulus Bowman’s capsule convoluted tubules collecting duct

10 6093/01/Prelim/4Exp/2026 18 Where is the waste product of amino acid metabolism produced and which organ excretes it? produced by excreted by A kidney liver B kidney skin C liver kidney D liver large intestine 19 The table shows the composition of a liquid found in the human body. component concentration/ arbitrary units ami