Temasek Sec 2024 Prelims 4E BIO P2 QP

No part of the paper is to be reproduced without the approval of the Principal of Temasek Secondary School. Name: Index Number: Class: _________ TEMASEK SECONDARY SCHOOL Preliminary Examination 2024 Secondary 4 Express BIOLOGY 6093/02 Paper 2 1 hour 45 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Do not open the booklet until you are told to do so. Write your name, index number and class 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 Section A /70 Section B /10 Total /80 This document consists of 23 printed pages and 1 blank page.

2 SECTION A Answer all questions. 1 Fig. 1.1 shows flowers of the sweet pea plant. Fig. 1.1 (a) Using information from Fig. 1.1, suggest how sweet pea flowers might be pollinated. Give a reason for your answer. ………………………………………………………………………………………….. ……………………………………………………………………………….…….…[1] (b) Fig. 1.2 shows a developing fruit and the remains of a flower. Fig. 1.2

3 (i) Name the parts labelled A to D in Fig. 1.2. A…..………………................. B ……………………………… C……………………………… D ……………….…..………… [2] (ii) State the role played by part E during the flowering stage. ……………………………………………………………………………….…[1] (iii) Circle and name the part of the flower on Fig. 1.2 that has a similar role to the vagina. Explain how they are similar. ………………………………………………………………………………….… ………………………………………………………………………………….[2] [Total: 6] 2 Tumours are group s of abnormal cells that divide uncontrollably, forming lumps or growth. Tumours that invade or spread into other tissues are called cancer. Fig. 2.1 shows where three of the same type of tumour were found in a patient. Fig. 2.1 (a) Suggest and explain one of the patient’s habits that could have increased his risk of lung cancer. …………………………………………………………………………………………. ……………………………………………………………………………….………[1] tumours

4 (b) Suggest how the tumour in the lungs affects his breathing. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………….…………[3] (c) The tumour blocks a duct in the liver that connects it to the gall bladder. Explain how and why the patient’s digestion is affected. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. ……………………………………………………………………………….………[2] (d) Explain whether lung cancer is an infectious or non-infectious disease. …………………………………………………………………………………………. ……………………………………………………………………………….………[1] [Total: 7]

5 3 Fig. 3.1 shows a farmer using her bicep muscles in her right arm to help her lift a tool. Fig. 3.1 (a) Explain whether lifting her tool is a voluntary or involuntary action. …………………………………………………………………………………………. …………………………………………………………………………….…………[1] (b) Describe the nervous pathway to the bicep in lifting her tool. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. ………………………………………………………………………………….……[3] (c) The farmer has not used any insecticides or artificial fertilisers on the crop. Explain how this may help the local environment. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. ……………………………………………………………………………….………[2] [Total: 6] right arm tool

6 4 Human body temperature is controlled within very narrow limits. Scientists investigated the effect of drinking ice-cold water on: • internal body temperature • the rate of sweating This is the method used. 1 Sit a person inside a room kept at a constant temperature of 25oC. 2 Measure the person’s internal body temperature near the brain. 3 Measure the person’s rate of sweating. 4 After 20 minutes, give the person 500 cm3 of ice-cold water to drink. 5 Continue to measure the person’s internal body temperature and sweating rate for a further 50 minutes. Fig. 4.1 and Fig. 4.2 show the scientists’ results. Fig. 4.1 internal body temperature in oC drinks ice-cold water time in minutes

7 Fig. 4.2 (a) Suggest why the person should not move during the investigation. …………………………………………………………………………………………. …………………………………………………………………………….…………[1] (b) Describe and explain the results shown in Fig. 4.1 on the internal body temperature, in the first 10 minutes when the ice-cold water was drunk. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. ……………………………………………………………………………….………[2] (c) Name the type of receptors that detect the change in the internal body temperature and the organ these receptors are located in. …………………………………………………………………………………………. …………………………………………………………………………….…………[1] rate of sweating in arbitrary units drinks ice-cold water time in minutes

8 (d) The rate of sweating changes between 24 minutes and 36 minutes. Explain how this change helps to maintain the person’s normal body temperature. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. ……………………………………………………………….………………………[2] [Total: 6] 5 Mitten crabs spend most of their lives in fresh water and only return to the sea to breed. In an investigation, mitten crabs were kept in fresh water and then moved into sea water. The water content and amino acid content in the muscle of these crabs were measured for 15 days after moving them from fresh water into sea water. Fig. 5.1 shows the results of this investigation. Fig. 5.1 water content in muscle cells (%) 80 75 70 0 5 10 15 350 300 250 200 amino acid content in muscle cells / a.u.

9 (a) Explain the changes in the water content in the muscle cells of the crabs as shown in Fig. 5.1. Refer to the changes in the amino acid content in your answer. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. …………………………………………………………………………………………. ……………………………………………………………………………….………[3] (b) Describe the importance of amino acids to the crab when in sea water. …………………………………………………………………………………………. ……………………………………………………………………………….………[1] (c) Crab meat is a source of proteins for humans. A student just consumed a meal rich in crab meat. Explain the difference in the blood amino acid con