2025 FH Prelim BIO Paper 2

1 Candidate Name: Class: Index No.: FUHUA SECONDARY SCHOOL Secondary Four Express PRELIMINARY EXAMINATION 2025 4E Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School Fuhua Secondary School BIOLOGY 6093/02 Paper 2 Candidates answer on the Question Paper No Additional Materials are required. DATE 1 September 2025 TIME 0800 – 0945 hrs DURATION 1 hour 45 minutes READ THESE INSTRUCTIONS FIRST Write your name, class and index number on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, glue or correction fluid. Section A Answer all questions. Write your answers in the spaces provided. Section B Answer one question. Write your answers in the spaces provided. The use of an approved scientific calculator is expected, where appropriate. The number of marks is given in brackets [ ] at the end of each question or part question. FOR EXAMINER’S USE PARENT’S SIGNATURE Section A Section B Total /70 /10 /80 Setter(s): Mr Owen Tan Vetter(s): Mr Nicholas Liu This document consists of 21 printed pages, including this page.

2 Section A Answer all questions. 1 Fig. 1.1 shows a genus of single-celled green algae known as Chlorella. Chlorella is a type of phytoplankton; it is known for its high photosynthetic efficiency and its potential as a dietary supplement to support nutritional needs of the body. Fig. 1.1 (a) Organelle X enables Chlorella to perform photosynthesis. Identify organelle X. ………………………………………………………………………………………... [1] X

3 (b) Fig. 1.2 shows the relationship between light intensity and the relative rate of photosynthesis in Chlorella. Fig. 1.2 Briefly describe the relationship between light intensity and the relative rate of photosynthesis in Chlorella shown in Fig. 1.2. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ………………………………………………………………………………………………. …………………………………………………………………………………………. [3]

4 (c) Fig. 1.3 shows the relationship between depth, rate of photosynthesis and respiration of Chlorella. Fig. 1.3 (i) With reference to Fig. 1.2 and 1.3, explain the shape of the curve showing the rate of photosynthesis in Fig. 1.3. ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… …………………………………………………………………………………… [4] (ii) Explain why Chlorella cannot live permanently at a depth below point Y as shown in Fig. 1.3. ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… …………………………………………………………………………………… [2] [Total: 10]

5 2 Fig. 2.1 shows an apparatus used to investigate the movement of substances. Fig. 2.1 (a) (i) Describe the change (if any) in level 1 and 2 after 4 hours. ………………………………………………………………………………………… …………………………………………………………………………………… [1] (ii) Explain your answer in (a)(i). ………………………………………………………………………………………… …………………………………………………………………………………… [1] (b) Prior to the start of the investigation, before the apparatus containing the starch mixture was immersed into the beaker of water, it was found that some of the mixture had already risen up the narrow glass tube. Identify and describe what causes this. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ………………………………………………………………………………………… [2] (c) The starch mixture was replaced using a solution of unknown solute A. Solute A is soluble in water. State another property of solute A that will cause level 1 to rise. ………………………………………………………………………………………………. ………………………………………………………………………………………… [1] [Total: 5]

6 3 Raw pineapple juice contains an enzyme called Bromelain. Bromelain has been used as a key ingredient to make meat softer and more tender. (a) (i) Suggest the type of enzyme found in pineapple juice. ……………………………………………………………………………………. [1] (ii) Explain how Bromelain tenderises the meat. ………………………………………………………………………………………… ……………………………………………………………………………………. [1] The chef has an idea to marinate meat with alkaline spring water after learning about the health benefits of drinking alkaline water. (b) The chef discovered that meat marinated with fresh pineapple juice and alkaline water was tough and hard to chew during food tasting. Explain this phenomenon. ……………………………………………………………………………………………….. ……………………………………………………………………………………………….. ……………………………………………………………………………………………….. ……………………………………………………………………………………………….. …………………………………………………………………………………………. [2] A dessert chef wanted to make pineapple jelly. The jelly powder used, primarily contains gelatin, which is a protein made from collagen. He experimented with both fresh and canned pineapple for his jelly dessert. It is known that high heat is used during the production of canned food. (c) The chef noticed that only jelly using canned pineapple can solidify whereas the jelly using fresh pineapple is unable to solidify. Explain this phenomenon. ……………………………………………………………………………………………….. ……………………………………………………………………………………………….. ……………………………………………………………………………………………….. ……………………………………………………………………………………………….. …………………………………………………………………………………………. [2] [Total: 6]

7 4 A patient has a disease which damages his pancreas and he is required to take one capsule of medicine shown in Fig. 4.1 daily to supplement his need for the presence of all pancreatic enzymes. Fig. 4.1 (a) Name two enzymes that can be produced in the pancreas of a healthy person. (i) ………………………………. (ii) ………………………………… [2] (b) Explain how the lipid coating ensures that the enzymes are only released in the small intestine when the capsule is taken by oral consumption. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ………………………………………………………………………………………… [2] (c) Suggest why the lipid coating is not digested by the enzyme beads in the capsule. ………………………………………………………………………………………………. ………………………………………………………………………………………… [1] (d) (i) State another medical condition, related to carbohydrate metabolism, which this patient may have. …………………………………………………………………………………… [1] (ii) Suggest two possible treatments for the medical condition stated in (d)(i). ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… ……………………………………………………………………………………. [2] [Total:8]

8 5 Fig. 5.1 shows a view of the heart from the front. Fig. 5.1 (a) Using only the letters A to F, list which of the blood vessels in Fig. 5.1 carries oxygenated blood. ………………………………………………………………………………………… [1] (b) (i) When a doctor takes your blood pressure, two re