2024 Sec 4IP Bio EOY Paper 2 - Final

Name: _________________________ ( ) Class: _____________ YEAR FOUR INTEGRATED PROGRAMME END-OF-YEAR EXAMINATION BIOLOGY Paper 2 2 October 2024 1 hour 45 minutes Candidates answer on the Question Paper. No Additional Materials are required. ________________________________________________________________________________ READ THESE INSTRUCTIONS FIRST Write your name, register 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 or graphs. Do not use paper clips, glue or correction fluid. Section A Answer all questions. Write your answers in the spaces provided on the Question Paper. Section B Answer only ONE question. Write your answers in the spaces provided on the Question Paper. Electronic calculators may be used. You are reminded of the need for clear presentation in your answers. The number of marks is given in brackets [ ] at the end of each question or part question. This document consists of 21 printed pages and 1 blank page. [Turn over For Examiner’s Use Section A (70) Section B (10) 10 Either 10 Or Total (80)

2 Section A Answer all questions. Write your answer in the spaces provided. 1 Fig. 1 shows a unicellular organism. Fig. 1 (a) State whether the organism in Fig. 1 should be classified as an animal, plant, bacteria, or virus. Give two reasons to support your answer. …….…………………………………………………………………………………………… …….…………………………………………………………………………………………… …….…………………………………………………………………………………………… …….…………………………………………………………………………………………… …….……………………………………………………………………………………….. [3]

3 (b) Suggest how the flagella of the organism in Fig. 1 would help it to survive. …….…………………………………………………………………………………………… …….……………………………………………………………………………………… [1] (c) An experiment was conducted where some of the organisms in Fig. 1 were placed in a test tube of concentrated sugar solution and observed over a period of time. State and explain the changes you would observe in the size of the cells. …….…………………………………………………………………………………………… …….…………………………………………………………………………………………… …….…………………………………………………………………………………………… …….…………………………………………………………………………………………… …….…………………………………………………………………………………………… …….……………………………………………………………………………………….. [3] [Total: 7 marks]

4 2 A student investigates the action of an enzyme from the human alimentary canal on starch. The setup for the investigation is shown in Fig. 2. Fig. 2 (a) Identify the enzyme and the sugar present in the solution after 30 minutes. Enzyme: ……………………………………………… Sugar: …………………………… [2] (b) Describe and explain a change that could be made to the investigation to ensure that there will be no more starch remaining in the visking tube after 30 minutes. …………………………………………………………………………………………………. …………………………………………………………………………………………………. …………………………………………………………………………………………………. ……………………………………………………………………………………………… [2] (c) The student compared the experimental setup to the human alimentary canal. Describe one similarity and one difference in terms of structure between the setup in Fig. 2 and the human alimentary canal. Similarity: …………………………………………………………………………………….. …………………………………………………………………………………………………. Difference: …………………………………………………………………………………… ……………………………………………………………………………………………... [2] [Total: 6 marks]

5 3 Fig. 3 shows an X -ray image of the blood vessels supplying the muscles of the heart. The arrows indicate areas where the blood vessels have been found to be narrowed. Fig. 3 (a) Name the blood vessels shown in Fig. 3. ……………………………………………………………………………………………... [1] (b) Suggest the cause of the narrowing of these blood vessels. …………………………………………………………………………………………………. …………………………………………………………………………………………………. …………………………………………………………………………………………………. ……………………………………………………………………………………………… [2] Narrowing of vessel 1 Narrowing of vessel 2

6 (c) A surgical procedure called a coronary bypass can be performed on the patient, where an artery can be taken from another part of the patient’s body and used to bypass the narrowed vessels, ensuring that the heart muscles have enough blood. Explain why the blood vessel taken from another part of the body should be an artery, and not a vein. …………………………………………………………………………………………………. …………………………………………………………………………………………………. …………………………………………………………………………………………………. ……………………………………………………………………………………………… [2] (d) State an improvement that the patient could make to his lifestyle to reduce his likelihood of dying from heart disease. …………………………………………………………………………………………………. ……………………………………………………………………………………………… [1] [Total: 6 marks]

7 4 Fig. 4.1 shows structures from the respiratory system that aid the gaseous exchange of two gases, X and Y. Fig. 4.1 (a) Explain two ways in which structures in Fig. 4.1 are suited to their function. …………………………………………………………………………………………….…… …………………………………………………………………………………………….…… ……………………………………………………………………………………………….… ……………………………………………………………………………………………... [2] (b) During vigorous exercise, the usual intake of gas Y may be inadequate to support muscular contractions. Describe and explain how the human body responds in such a situation in order to take in sufficient amounts of gas Y. …………………………………………………………………………………………….…… …………………………………………………………………………………………….…… …………………………………………………………………………………………….…… …………………………………………………………………………………………….…… ……………………………………………………………………………………………….… ……………………………………………………………………………………………... [3] (c) Gas X is removed from the body by the process of excretion. (i) Define excretion. ……………………………………………………………………………………….. [1] (ii) State the chemical equation for the process that forms Gas X in the human body. ……………………………………………………………………………………….. [1] X Y Y X

8 (d) There are other excretory organs in the human body. Fig. 4.2 shows a machine used to aid patients who have lost their function in such an organ. Fig. 4.2 (i) Name the organ in the human body that carries out the processes shown in Fig. 4.2. ……………………………………………………………………………………….. [1] (ii) Explain how the machine in Fig. 4.2 effectively aids the patients when this organ has failed. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… ……………………………………………………………………………………….. [3] [Total: 11 marks] Fresh dialysis fluid Used dialysis fluid Patient Blood pump Dialyser

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10 5 An investigation was conducted to compare between the thermal regulation of a mouse and a lizard. Table 5 shows the results of the investigation. Table 5 environmental temperature / oC body temperature of mouse / oC body temperature of lizard / oC 0 31.0 0.2 10 30.9 9.8 20 31.2 20.3 30 31.3 29.9 40 31.2 39.8 (a) Plot a graph using the given data. [4]