Cambridge IGCSE Marine Science (Maldives only) 0697 — 2023 May/June Paper 3 · Variant 0

This document has 12 pages. Any blank pages are indicated. [Turn over DC (KS) 327319 © UCLES 2023 * 0 0 3 3 6 6 1 8 0 9 * MARINE SCIENCE 0697/03 Paper 3 Practical Assessment Paper May/June 2023 1 hour 30 minutes You must answer on the question paper. No additional materials are needed. INSTRUCTIONS ● Answer all questions. ● Use a black or dark blue pen. You may use an HB pencil for any diagrams or graphs. ● Write your name, centre number and candidate number in the boxes at the top of the page. ● Write your answer to each question in the space provided. ● Do not use an erasable pen or correction fluid. ● Do not write on any bar codes. ● You may use a calculator. ● You should show all your working and use appropriate units. INFORMATION ● The total mark for this paper is 60. ● The number of marks for each question or part question is shown in brackets [ ]. Cambridge IGCSE™

2 0697/03/M/J/23 © UCLES 2023 1 Fig. 1.1 is an image of a unicorn fish. Fig. 1.1 (a) Make a large accurate drawing of the specimen shown in Fig. 1.1. [4] (b) On your drawing label each of the following features: • the lateral line • two named median fins (for example the anal fin). [3]

3 0697/03/M/J/23 © UCLES 2023 [Turn over (c) (i) The actual total length of the fish is 43 cm. Add a scale line to Fig. 1.1 to show the total length of the fish. [1] (ii) Calculate the magnification of the image using the formula shown. magnification = image length actual length Show your working. … [3] [Total: 11]

4 0697/03/M/J/23 © UCLES 2023 2 Fig. 2.1 A and B shows two different marine invertebrates. These are not to the same scale. A B Fig. 2.1 (a) State the phylum that each of organism A and organism B belong to. A … B … [2] (b) Table 2.1 shows some features used to help identify marine organisms. Complete Table 2.1 by: • placing a tick (3) in the box if the feature is present in the organism. • placing a cross (7) in the box if the feature is not present in the organism. Table 2.1 feature organism A organism B tube feet setae segmented body pentaradial symmetry [4]

5 0697/03/M/J/23 © UCLES 2023 [Turn over (c) A sea cucumber hatchery collects data on length and mass of juvenile sea cucumbers. Table 2.2 shows their results. Table 2.2 length / mm mass / g 69 24.2 74 29.6 64 22.1 83 31.8 78 30.3 mean 27.6 (i) Use the data in Table 2.2 to calculate the mean length of the juvenile sea cucumbers. Show your working. … mm [2] (ii) State the ratio of mean length to mean mass of the juvenile sea cucumbers in its simplest form. Give your answer to one decimal place. … [2] [Total: 10]

6 0697/03/M/J/23 © UCLES 2023 3 (a) A student is given three different food samples to test for the presence of nutrients. (i) Describe the biochemical test and the positive result for non-reducing sugars. … … … … … … … … [4] (ii) Describe the biochemical test and the positive result for protein. … … … … [2]

7 0697/03/M/J/23 © UCLES 2023 [Turn over (b) Fig. 3.1 shows different stages in an experiment to demonstrate the difference in density between samples of sea water and fresh water. In stage 1, the fresh water is coloured. In stage 2, colourless sea water is added to the bowl. stage 1 stage 2 stage 3 coloured fresh water bowl colourless sea water Fig. 3.1 (i) On Fig. 3.1 draw the final observation in stage 3 when all the colourless sea water has been added to the coloured fresh water in the bowl. [1] (ii) Explain your answer to (i). … … … … [2] (iii) State the name of the instrument used to measure density of a liquid. … [1] [Total: 10]

8 0697/03/M/J/23 © UCLES 2023 4 Scientists investigated the relationship between female fish mass and the total number of eggs in the ovaries (fecundity) of a sample of herring fish. (a) Fig. 4.1 shows results taken from their notebook. 247g 110 000 132g 43 000 105g 34 000 215g 92 000 170g 60 000 Fig. 4.1 (i) Draw a table of results for the data shown in Fig. 4.1. In your table rank by fish mass, from smallest to largest. [3] (ii) The scientist has the data for one other fish. The total mass of the ovaries is 11 g. In a 0.1 g sample she counts 425 eggs. Calculate the total number of eggs in the ovaries of this fish. … [1]

9 0697/03/M/J/23 © UCLES 2023 [Turn over (b) Fig. 4.2 is a graph grid on which you will plot the data from Fig. 4.1. (i) Complete Fig. 4.2 by adding a label and scale for the y-axis. [2] (ii) Plot the data from Fig. 4.1 onto Fig. 4.2. Use x to mark your points. [2] (iii) Draw a single straight line of best fit for the data on Fig. 4.2. Use a ruler. [1] 100 120 140 160 180 fish mass / g … … … 200 220 240 260 120 0 Fig. 4.2 (iv) Use the graph to predict the fecundity of a female fish with a mass of 200 g. … [1] (c) State the relationship between the mass of female fish and fecundity, shown in Fig. 4.2. … … [1] [Total: 11]

10 0697/03/M/J/23 © UCLES 2023 5 A student observed that the distribution of red algae was not uniform on a rocky shore. The student formed the following hypothesis. Red algae populations decrease as the distance from the waterline increases up the rocky shore. Design and describe an investigation which you could carry out to test this hypothesis. Use the headings given to structure your answer. • method, including all the equipment needed and a safety precaution • presentation and analysis of the results (a) method, including all the equipment needed and a safety precaution … … … … … … … … … … … … … … … … … …

11 0697/03/M/J/23 © UCLES 2023 presentation and analysis of the results … … … … … … … … … … … … [13] (b) Describe the limitations of your method and suggest improvements. Suggest further work to extend the investigation. … … … … … … … … … … [5] [Total: 18]

12 0697/03/M/J/23 © UCLES 2023 Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity. To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge Assessment International Education Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download at www.cambridgeinternational.org after the live examination series. Cambridge Assessment International Education is part of Cambridge Assessment. Cambridge Assessment is the brand name of the University of Cambridge Local Examinations Syndicate (UCLES), which is a department of the University of Cambridge. BLANK PAGE