Jurongville Pure Biology Prelim 2024 Paper 1

JVSS Prelim 2024 4E Biology 6093/01 [Turn over JURONGVILLE SECONDARY SCHOOL PRELIMINARY EXAMINATION 2024 Secondary 4 Express STUDENT NAME CLASS INDEX NUMBER BIOLOGY 6093/01 Paper 1 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. White your name, index number and class on the Answer Sheet 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 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. DO NOT OPEN THE BOOKLET UNTIL YOU ARE TOLD TO DO SO This document consists of 18 printed pages. For Examiner’s Use 40 O

2 JVSS Prelim 2024 4E Biology 6093/01 1 The diagram below shows an animal cell. Radioactively labelled amino acids are introduced to the cell. In which structure will radioactivity be first detected? 2 Which mature cell contains a nucleus? A red blood cell B root hair cell C sieve tube element D xylem vessel 3 Which process can only occur through a partially permeable membrane? active transport diffusion osmosis key A √ √ √ √ = yes B √ X X X = no C √ X √ D X √ √ A B C D

3 JVSS Prelim 2024 4E Biology 6093/01 [Turn over 4 Five strips are cut from a potato, all of equal size and shape. The strips are then placed in sugar solutions of different concentrations. After four hours, the change in length of each potato strip is measured. The results are shown in the graph below. Which concentration of sugar solution has approximately the same water potential as the potato? A 0.00 mol dm-3 B 0.15 mol dm-3 C 0.30 mol dm-3 D 0.40 mol dm-3 5 A student conducted a series of food tests on an unknown sample of food. The results are shown in the table below. What is the unknown sample most likely to be? reagent added observation iodine remains yellow Benedict’s solution orange precipitate Biuret reagent remains blue ethanol remains clear A apple slices B butter C fried fish D toasted bread

4 JVSS Prelim 2024 4E Biology 6093/01 6 A dish is filled with agar jelly containing starch. Four holes were cut in the jelly and each hole was filled as shown in the diagram below. After 30 minutes, which hole will be surrounded by the largest area without starch? 7 The graph below shows the effect of pH on enzyme activity. What can be concluded from the graph? A At pH 9, all enzymes are denatured. B Enzyme activity stops when at pH 3. C The enzymes work best when they are placed in acidic mediums. D The greatest number of enzyme-substrate complexes form at pH 7. A B D C enzyme activity / arbitrary units

5 JVSS Prelim 2024 4E Biology 6093/01 [Turn over 8 The graph shows the percentage of undigested food molecules in the alimentary canal. What is part X likely to be? A duodenum B ileum C oesophagus D stomach 9 The diagram below shows some cells from a newborn’s blood under a microscope. Newborn babies are known to have elevated levels of cell Y. Which of the following best explains why newborns have elevated levels of cell Y? A The nitrogenous waste materials need to be removed at a faster rate in newborns. B Their blood needs to clot when the umbilical cord is cut upon birth. C There is a greater susceptibility to infections in newborns. D They require a greater need to transport oxygen as they can breathe on their own. fats carbohydrates proteins percentage of undigested food molecules V W X Y Z Y mouth anus

6 JVSS Prelim 2024 4E Biology 6093/01 10 The diagram below shows the external view of the heart. What would occur if structure X was blocked? A blood cannot enter the heart B decrease in oxygen transported to the heart muscles C rate of contraction of heart muscles increases D valves in the heart fail and allows backflow of blood 11 The graph below shows pressure changes that occur during a cardiac cycle. What happens to the atrioventricular valves and semilunar valves between W and X? atrioventricular valve semilunar valve A closed closed B closed open C open closed D open open

7 JVSS Prelim 2024 4E Biology 6093/01 [Turn over 12 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 raised 13 An athlete runs a race. The graph shows how the concentration of lactic acid in his leg muscles changes. How long did the athlete run for? A 2 minutes B 4 minutes C 6 minutes D 10 minutes pressure in lungs expiration time inspiration A B C D

8 JVSS Prelim 2024 4E Biology 6093/01 14 The diagram below shows the bronchus lining of a smoker and non-smoker. Why is it harder for the smoker to remove mucus from his respiratory tract? A The smoker produces less mucus than the non-smoker. B The smoker has less epithelial cells than the non-smoker. C A significant number of cilia are damaged in the smoker’s epithelial cells. D The smoker’s epithelial cells have burst. 15 The diagram below shows the production and excretion of materials in the body. What are V, W, X, Y and Z in the diagram? V W X Y Z A aerobic respiration deamination lungs urea kidney B aerobic respiration filtration urea lungs kidney C anaerobic respiration deamination kidneys urea lungs D anaerobic respiration filtration lungs lungs urea smoker non-smoker carbon dioxide liver cells amino acids X Y excess salt Z V W

9 JVSS Prelim 2024 4E Biology 6093/01 [Turn over 16 The diagram below shows the flow of blood and dialysis fluid through a dialysis machine. Where would the urea concentration be the highest? A 1 and 2 B 1 and 4 C 2 and 3 D 2 and 4 17 Two fluid samples were drawn from different parts of the kidney nephron and the components of the fluids were analysed. The results are shown in the table below. component fluid P (g / L) fluid Q (g / L) glucose 0.0 0.9 sodium ions 5.0 3.5 urea 20.0 0.3 Which parts of the kidney nephron were fluids P and Q extracted from? fluid P fluid Q A collecting duct glomerulus B glomerulus collecting duct C glomerulus proximal convoluted tubule D proximal convoluted tubule collecting duct

10 JVSS Prelim 2024 4E Biology 6093/01 18 The graph below shows the concentration changes of blood glucose and a hormo