KSS EOY 2026 3G3 Biology

1 [Turn over KRANJI SECONDARY SCHOOL End-of-Year Examinations 2026 BIOLOGY K325 Level : Secondary Three Date : 29 Sep 2026 Stream: G3 Duration: 2 h 15 min Name : [ ] Total Marks : obtained: Class : Secondary ______ Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write your name, class and index number on all the work you hand in. You may use an HB pencil for any diagrams, graphs, tables or rough working. Write in dark blue or black pen. Do not use staples, paper clips, glue or correction fluid. The use of an approved scientific calculator is expected, where appropriate. Section A There are thirty questions. 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. Sections B and C Answer all questions. Write your answers in the spaces provided on the question paper. The number of marks is given in brackets [ ] at the end of each part question. You may lose marks if you do not show your working or if you do not use appropriate units. Section C will be collected separately from Sections A and B. Set by: Ms Ong Zhen Hui This Question Paper consists of 26 printed pages. Section Marks obtained A 30 B 40 C 30 Total 100 3G3 Session 2 100

2 Section A: Multiple Choice Questions [30 marks] For each question, there are four possible answers, A, B, C and D. Choose the most suitable answer and shade your answers in the Multiple Choice Answer Sheet provided. 1 The image shows an organelle found in the cell. Which of the statements about the organelle is not true? A It contains chlorophyll to absorb light energy for photosynthesis. B It is not found in muscle cells. C It is surrounded by a double membrane. D It is the site of aerobic respiration in cells. 2 Which statement about mature red blood cells is true? A The biconcave shape decreases the amount of energy used by the cell. B They contain haemoglobin that increases their surface area to volume ratio. C They do not contain nuclei to carry more haemoglobin. D The lack of nuclei allows red blood cell to repair itself. 3 The cell wall of a plant cell is removed using an enzyme. What would happen if this cell was placed in distilled water? A It would take more time for the cell to become turgid. B Proteins in the cytoplasm would leave through the cell membrane. C The cell would become smaller as water molecules move out. D The cell would burst as water molecules move into the cell.

3 [Turn over 4 The figure shows four sections of a water spinach stem before and after immersion in solutions P, Q, R and S of different salt concentrations. Each section consists of inner tissue and a waxy cuticle that is relatively impermeable to water and does not change significantly in length. Which shows the relative concentrations of the four solutions? highest concentration lowest concentration A P S R Q B R S P Q C Q R S P D Q P S R 5 The following are steps a student conducted to test for reducing sugar. I prepare a boiling water bath II place 5 cm3 of solid sample into a test tube III add 3 cm3 of biuret solution to the sample IV place test tube in the boiling water bath for 2 minutes Which step(s) were conducted incorrectly? A II only B I and III only C II and III only D I and IV only stem before immersion: stem after immersion: inner tissue outer waxy cuticle P Q R S

4 6 The graph shows the enzyme activity of three enzymes, P, Q and R at different pH. All three enzymes can be found in the human alimentary canal. Which organ can enzyme P be found in? A duodenum B mouth C oesophagus D stomach 7 A food sample containing starch and fat was mixed with pancreatic juice. After 2 hours, a series of food tests were carried out on the food sample. Which row correctly shows the colour of the results? iodine test Benedict’s test ethanol emulsion test A blue-black blue clear B blue-black brick-red white C brown blue clear D brown brick-red clear 8 Which of the following is not a function of the liver? A breakdown of glycogen B breakdown of hormones C storage of bile D storage of glycogen enzyme activity pH P Q R 2 4 6 8 10 I I I I I

5 [Turn over 9 What happens to a bolus of food as it passes through the oesophagus? A Fats begin to be digested. B Proteins are being denatured. C Proteins continue to be digested. D Starch continues to be digested. 10 The products of digested food are present in the ileum. Which of the following substances enter a blood capillary and a lacteal in a villus? blood capillary lacteal A amino acids and glucose fatty acids and glycerol B amino acids and glycerol fatty acids and glucose C fatty acids and glucose amino acids and glycerol D fatty acids and glycerol amino acids and glucose 11 A man just had a meal high in proteins and starch. How will the blood composition in the hepatic portal vein and hepatic vein differ? hepatic portal vein hepatic vein A higher in amino acids lower in amino acids B higher in starch lower in starch C lower in amino acids higher in amino acids D lower in starch higher in starch 12 Which two organs produce substances involved in carbohydrate digestion? A liver and gall bladder B mouth and pancreas C pancreas and stomach D stomach and liver 13 Which of the following is an effect of excessive alcohol consumption? A an increase in volume of the brain B gastric pain due to stomach ulcers C oxygen is unable to bind to red blood cells D red blood cells detected in urine

6 14 The table shows some information about three blood vessels P, Q and R of a human being. blood vessel diameter / mm thickness of wall / mm percentage composition of wall / % muscle elastic fibre P 10 1 20 60 Q 15 0.5 5 5 R 0.05 0.001 0 0 Which row correctly identifies blood vessels P, Q and R? P Q R A artery vein capillary B artery arteriole vein C vein artery capillary D vein capillary artery 15 The blood of three people X, Y and Z was tested with plasma from blood groups A and B to determine their blood groups. The results are shown below. Which row shows the correct blood types of person X, Y and Z? X Y Z A A AB O B A O AB C B AB O D B O AB X Y Z clumps clumps clumps no clumping no clumping no clumping blood of person plasma from blood group A plasma from blood group B

7 [Turn over 16 Which statement about blood clotting is correct? A Insoluble fibrinogen is converted to soluble fibrin threads. B Platelets contain enzymes to initiate the clotting process. C The clot is made of fibrin threads only. D White blood cells detect the injury and start the clotting process. 17 What is the route taken by blood as it moves through the human circulatory system? A heart → lungs → heart → liver → small intestines B heart → lungs → heart → small intestines → liver C heart → lungs → liver → heart → small intestines D heart → lungs → small intestines → liver → heart 18 The diagram shows the blood supply to cells lining a