Cambridge IGCSE Marine Science (Maldives only) 0697 — 2021 May/June Paper 3 · Variant 0

This document has 16 pages. Any blank pages are indicated. Cambridge IGCSE™ MARINE SCIENCE 0697/03 Paper 3 Practical Assessment Paper May/June 2021 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 [ ]. * 3 3 9 4 4 8 0 7 6 4 * DC (LO) 213975 © UCLES 2021 [Turn over

2 0697/03/M/J/21 © UCLES 2021 1 (a) Fig. 1.1 shows a diagram of a dissected fish. Fig. 1.1 On Fig. 1.1 label: • swim bladder • gut • gonad. [3]

3 0697/03/M/J/21 © UCLES 2021 [Turn over (b) Fig. 1.2 shows a single gill of a fish. height Fig. 1.2 In the space below draw a large diagram of the gill. [4]

4 0697/03/M/J/21 © UCLES 2021 (c) (i) Measure the height of the gill in Fig. 1.2, and record it with the units. … [2] (ii) The magnification of the photograph is × 2.5. Calculate the actual height of the gill. Use the formula magnification = image size actual size … cm [2] [Total: 11]

5 0697/03/M/J/21 © UCLES 2021 [Turn over 2 (a) Table 2.1 shows fish in three different habitats. The habitats are: • a coral reef • the open ocean • the sea bed. Complete Table 2.1 by identifying the habitat for each fish. For each fish state one adaptation to their habitat that is visible in the photographs. Table 2.1 habitat … habitat … habitat … adaptation to the habitat … … … … adaptation to the habitat … … … … adaptation to the habitat … … … … [4]

6 0697/03/M/J/21 © UCLES 2021 (b) Scientists investigate the swimming speeds of three species of fish J, K and L from different habitats. Fig. 2.1 shows the measuring tape for Fish J on its timed swim. The timed swim starts at S and ends at F. 0 50 100 150 200 250 300 S F S F Fig. 2.1 Table 2.2 shows some of the results of the investigation. Table 2.2 fish species distance covered / cm time taken / s swimming speed / cm per s J … … … K 1092 6 182 L 114 000 60 1900 (i) Calculate the distance travelled by Fish J during the timed swim. Add this to Table 2.2. [1]

7 0697/03/M/J/21 © UCLES 2021 [Turn over Fig. 2.2 shows the stopwatch used to time the swim of Fish J. Fig. 2.2 (ii) Record the time taken in Table 2.2. [1] (iii) Calculate the swimming speed of Fish J and record this in Table 2.2. Use the formula speed = distance time [1] (iv) Suggest which fish, J, K or L, is from the open ocean. Fish … [1] [Total: 8] 3 A scientist investigates abiotic factors in a beach environment. (a) Describe a method used to measure the slope of a beach. … … … … … … … … [4]

8 0697/03/M/J/21 © UCLES 2021 (b) Describe a method used to measure the tidal amplitude at a beach over a 24-hour period. Include a safety precaution. … … … … … … … … [4] (c) Describe the method used to measure the mean water-current speed in the near-shore area of the beach. … … … … … … … … … … [5] [Total: 13]

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10 0697/03/M/J/21 © UCLES 2021 4 Scientists investigate the gut contents of juvenile green sea turtles that are found dead. The gut contents contain plastics and litter. Fig. 4.1 shows the percentage of the different types of plastic and litter found in the sea turtles’ gut. fishing line 7.7% plastic bags 47.6% rubber 1.1% hard plastics 38.5% polystyrene 5.1% Fig. 4.1 (a) Draw a table to present this data, ranking the items from highest percentage to lowest percentage. [4]

11 0697/03/M/J/21 © UCLES 2021 [Turn over (b) Draw a bar graph to represent this data. [4] (c) Suggest two impacts this plastic and litter has on the sea turtles. 1 … … 2 … … [2] [Total: 10]

12 0697/03/M/J/21 © UCLES 2021 5 A student knows that red algae can grow at greater depths than green algae. The student forms the hypothesis: ‘red algae photosynthesise more at low light intensities than green algae’ (a) 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 • The presentation and evaluation of the results Method, including all the equipment needed … … … … … … … … … … … … … … … … … …

13 0697/03/M/J/21 © UCLES 2021 Presentation and evaluation of the results … … … … … … … … … … … … [13] (b) Describe the limitations of your method. Suggest further work to extend and improve the investigation. … … … … … … … … … … [5] [Total: 18]

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16 0697/03/M/J/21 © UCLES 2021 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 the Cambridge Assessment Group. Cambridge Assessment is the brand name of the University of Cambridge Local Examinations Syndicate (UCLES), which itself is a department of the University of Cambridge. BLANK PAGE