ACSI(I) Y4IP 2023 Biology Common Test Paper 2

Name Class Index Number Anglo-Chinese School (Independent) Year 4 IP/SBGE Biology Term 2 Common Test 2023 TERM 1 CLASS TEST BIOLOGY Paper 2 21 April 2023 1 Hour 45 Minutes No Additional Materials are required. INSTRUCTIONS TO STUDENTS Write your name, class, and index number in the spaces at the top of the Question paper. Write in dark blue or black pen. Use a pencil for any diagrams or graphs. Section B and Section C Answer all questions in the spaces provided on the Question paper. At the end of the test, submit the Question paper. INFORMATION FOR CANDIDATES The intended number of marks is given in brackets [ ] at the end of each question or part question. This paper consists of 17 printed pages including this cover page. Name of Parent / Guardian: Signature & Date: Anglo-Chinese School (Independent) YEAR 4 INTEGRATED PROGRAMME / SBGE / ACS TERM 2 COMMON TEST For Examiner’s Use Section A / 30 Section B / 40 Section C / 10 Total / 80

2 Anglo-Chinese School (Independent) Year 4 IP/SBGE Biology Term 2 Common Test 2023 [Turn over Section B 1 Fig. 1 below shows a diagrammatic representation of an artificial kidney machine. Fig. 1 (a) Explain why the tubings are coiled rather than straight. [1] (b) Explain why it is important that the flow of the dialysis fluid is opposite to the blood. [1] Coiled tubings

3 Anglo-Chinese School (Independent) Year 4 IP/SBGE Biology Term 2 Common Test 2023 [Turn over (c) The dialysis fluid contains a carefully regulated amount of dissolved salts and glucose with a composition similar to blood plasma, without nitrogenous waste. (i) Explain why the concentration of glucose in the dialysis fluid is maintained at the same concentration as that in the patient’s blood. [1] (ii) Why must the dialysis fluid be changed regularly? [1] (iii) During dialysis, state which types of blood vessel is blood: (1) withdrawn from the human body (using the new method - fistula). (2) return to the human body. [1] (1) (2) [Total: 5]

4 Anglo-Chinese School (Independent) Year 4 IP/SBGE Biology Term 2 Common Test 2023 [Turn over 2 The graph below shows the level of glucose in the blood plasma after a man has orally taken in 100 g of glucose and 40 g of fat. (a) What is the fluctuation in the level of blood glucose 1 hour after the oral intake of (i) the 100 g of glucose; [1] (ii) the 40 g of fat? [1] (i) (ii) (b) How long does it take for the level of blood glucose to return to normal level after the intake of glucose? [1]

5 Anglo-Chinese School (Independent) Year 4 IP/SBGE Biology Term 2 Common Test 2023 [Turn over (c) Explain how the body brings the high level of glucose back to normal. [2] [Total: 5]

6 Anglo-Chinese School (Independent) Year 4 IP/SBGE Biology Term 2 Common Test 2023 [Turn over 3 Fig. 3 shows the changes in the concentration of urine and the rate of flow of urine when the concentration of antidiuretic hormone (ADH) in the blood plasma changes. Fig.3 (a) With reference to Fig.3, describe the relationship between the concentration of ADH in the blood plasma and the concentration of urine. Give a reason for the relationship. [3] Concentration of urine /arbitrary units Concentration of ADH in blood plasma/arbitrary units Rate of flow of urine through the ureter /arbitrary units rate of flow of urine through the ureter concentration of urine

7 Anglo-Chinese School (Independent) Year 4 IP/SBGE Biology Term 2 Common Test 2023 [Turn over (b) Suggest how vigorous exercise may affect the concentration of ADH in the blood. [2] [Total: 5] 4 Fig. 4 shows a spinal cord with an incomplete reflex arc that involves three neurones. Fig.4 In Fig. 4: (a) Draw and label the neurones that conduct nerve impulses into and through the spinal cord to complete the reflex arc. One neurone has been drawn for you. [3] (b) Label clearly, the grey matter in the spinal cord. [1] [Total: 4] spinal cord

8 Anglo-Chinese School (Independent) Year 4 IP/SBGE Biology Term 2 Common Test 2023 [Turn over 5 Fig. 5 shows the internal structure of an eye. Fig. 5 (a) Name and state the function of the parts labelled A and B. [4] A: B: (b) On Fig. 5, name and label the region of the retina with the most cone receptors. [1] [Total: 5] B A

9 Anglo-Chinese School (Independent) Year 4 IP/SBGE Biology Term 2 Common Test 2023 [Turn over 6 A student carried out an investigation to observe mitosis in the root tip of an onion (Allium cepa). (a) Table 6 shows the number of cells in each stage of mitosis. Stage of mitosis Number of cells in each stage of mitosis Percentage of cells in each stage of mitosis Prophase 217 83.8 Metaphase 19 Anaphase 8 3.1 Telophase 15 5.8 Table 6 (i) Complete table 6 to show the percentage of cells that were in metaphase. [1] (ii) A mitotic index can be calculated for a tissue. This is a measure of the rate of mitosis. Mitotic index = The student counted a total of 863 cells. Using the formula and data from the table, calculate the mitotic index for the root tip. Show your working clearly in the space below. Round off your answer to the nearest 1 decimal place. [2] Number of dividing cells Total number of cells

10 Anglo-Chinese School (Independent) Year 4 IP/SBGE Biology Term 2 Common Test 2023 [Turn over (b) Fig. 6 shows a nucleus of a cell undergoing mitosis. Fig. 6 (i) Identify the structures R and Q [1] R: Q: (ii) State the number of chromosomes in this cell. [1] [Total: 5]