PLMGSS 2025 Sec 3 G3 Pure Biology EOY Paper 1

BIOLOGY modified 6093 / 01 Paper 1 Multiple Choice 8 October 2025 Additional Materials: Multiple Choice Answer Sheet Redox Reacti45 minutes READ THESE INSTRUCTIONS FIRST Write in soft pencil. Write your name and index number on the separate Answer Sheet in the spaces provided. Do not use staples, paper clips, highlighters, glue or correction fluid. There are thirty multiple-choice questions in 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. 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 total mark for this paper is 30 marks. The use of an approved scientific calculator is expected, where appropriate. This document consists of 17 pages. CANDIDATE NAME CLASS 3 . INDEX NUMBER Paya Lebar Methodist Girls’ School (Secondary) End Of Year Examination 2025 Secondary 3 Express / G3

2 1 The diagram shows two cells. Which process happens in only one of these cells? A controlling the chemical reactions in the cell B controlling the movement of substances into the cell C making carbohydrates from carbon dioxide D using glucose inside the cell 2 Which of the following cells is most likely to have the least amount of mitochondria?

3 [Turn over 3 The table below shows the results of an experiment measuring the mass of four nutrients (P, Q, R, S) absorbed by the roots of a plant in one hour. The experiment was done in two sets of conditions, in the presence and absence of oxygen. nutrient mass absorbed in presence of oxygen / g per hour mass absorbed in absence of oxygen / g per hour P 3.5 3.3 Q 4.5 1.0 R 0.9 0.8 S 2.6 0.7 Which of the following conclusions can be made from the results? A Nutrients P and R are mainly absorbed through active transport. B Nutrients P and S are mainly absorbed through diffusion. C Nutrients Q and R are mainly absorbed through diffusion. D Nutrients Q and S are mainly absorbed through active transport. 4 In which row will the diffusion of ions into a cell be the quickest? ion concentration in the cell ion concentration in the external solution surface area-to- volume ratio of the cell width of the cell membrane A high low large thin B low high small thick C high low small thick D low high large thin 5 Four solutions were tested to see if they contained protein, starch or glucose. The colours of the solutions after the tests are recorded in the table. Which solution contained protein and glucose but not starch? biuret test iodine solution test Benedict’s solution test A blue yellow-brown red B blue blue-black blue C purple yellow-brown red D purple blue-black blue

4 6 Which of the following is a correct statement about biological molecules? A Glycogen is made of smaller glycerol molecules. B Oils contain the chemical elements carbon, hydrogen, oxygen and nitrogen. C Protein is made of smaller amino acid molecules. D Glycerol is made up of smaller glucose molecules. 7 The diagram shows two food molecules before and after they have been digested by enzymes. Which identifies the product of digestion by maltase? 8 The graph shows the concentration of a substance during an enzyme -controlled reaction. Which substance is this? A enzyme B enzyme-substrate complex C product D substrate A B C D concentration time

5 [Turn over 9 Some students investigated the effect of temperature on the digestion of starch to form maltose. They added equal volumes of amylase and starch solution to a number of test -tubes. The test -tubes were left for 30 minutes at a range of temperatures between 10°C and 60°C. They then measured the concentration of starch in each test-tube. Which graph was produced from these results?

6 10 The diagram shows an experiment on the digestion of protein in egg albumen by protease. The protease was taken from a human stomach. In which test-tube will protein be digested most quickly? 11 The diagram shows the apparatus used in an experiment to demonstrate two processes that take place in the body. After one hour, the water outside the dialysis tubing contained reducing sugars. Which two processes are represented by this experiment? A absorption and egestion B absorption and digestion C digestion and egestion D digestion and ingestion

7 [Turn over 12 The figure illustrates a surgical procedure that is available to a select group of individuals. Which of the following is not a likely result of this procedure? A chyme produced is of higher pH value B decreased formation of polypeptides C earlier sensation of fullness D increased egestion of waste products

8 13 The diagram shows a section through a villus. Which sequence correctly describes the function of the numbered parts? 1 2 3 4 A transports digested fats transports glucose absorbs digested food produces mucus B transports digested fats transports glucose produces mucus absorbs digested food C transports glucose transports digested fats absorbs digested food produces mucus D transports glucose transports digested fats produces mucus absorbs digested food magnified

9 [Turn over 14 Which parts of the human digestive system is involved in producing enzymes? A 1 and 2 only B 2 and 4 only C 3 and 4 only D 1, 2 and 4 only 15 A patient had to have half of his liver removed. What would happen after the surgery? 1 The faeces become oily. 2 Fat digestion is reduced. 3 The production of lipase is reduced. 4 Urea concentration in the blood is increased. A 1 and 2 only B 1 and 3 only C 2, 3 and 4 only D 1, 2, 3 and 4 1 2 3 4

10 16 The diagram represents a tissue with an adjacent blood capillary. Which substances can 1 and 2 represent? 1 2 A urea carbon dioxide B carbon dioxide glucose C glucose oxygen D oxygen carbon dioxide 17 A sample of blood is taken from a patient and tested with serum containing antibody a and antibody b. The results of the test are shown below. serum with antibodies a serum with antibodies b blood sample Which of the following is a correct conclusion on the blood type of the patient? A He can donate blood to another person of blood type AB. B He can donate blood to another person of blood type O. C His red blood cells contain antigen B. D His red blood cells do not contain any antigens.