Marine ecosystems and biodiversity — IGCSE Marine Science (0697) questions by topic
Eleven questions ask you to name coastal ecosystems beyond mangroves and coral reefs, state a function of the cell wall in seagrass, explain migration's role for leatherback turtles, or discuss why plankton matters to the marine ecosystem, worth between 8 and 16 marks.
Explain, state, describe, draw and name cover a broad range of demands, and discuss specifically expects reasoned importance, not a list. All 11 questions here come from 2025 papers, and this page's instant marking is suited to checking precision of terminology on data and diagram-based answers, since a marker's feedback on a mislabelled ecosystem or an incomplete explanation shows exactly where a mark was lost.
May–June 2025, Paper 11
Some statements about different ocean zones are listed. Draw a single ruled line to match each ocean zone to the statement which correctly describes the ocean zone. You should…
Answer this question and get it marked →Coastal ecosystems provide important benefits, such as recreation and tourism, to humans. Mangrove forests and coral reefs are two types of coastal ecosystems. Name two other…
Answer this question and get it marked →Fig. 5.1 shows a manatee eating seagrass. Seagrass cells have cell walls. State one function of the cell wall.
Answer this question and get it marked →Fig. 8.1 shows a mixture of phytoplankton and zooplankton. Discuss the importance of plankton to the marine ecosystem.
Answer this question and get it marked →May–June 2025, Paper 12
Fig. 8.1 shows a mixture of phytoplankton and zooplankton (a microscope image of many small drifting planktonic organisms, including a larger elongated organism among numerous…
Answer this question and get it marked →May–June 2025, Paper 13
Fig. 8.1 shows a mixture of phytoplankton and zooplankton. Discuss the importance of plankton to the marine ecosystem.
Answer this question and get it marked →May–June 2025, Paper 21
Fig. 1.1 shows shrimps on sale at a fish market. Shrimps are crustaceans. State two main characteristic features of crustaceans.
Answer this question and get it marked →Fig. 3.1 shows an ocean food web. Name one primary consumer in the food web shown in Fig. 3.1.
Answer this question and get it marked →Female leatherback turtles lay eggs in nests on sandy shores. Fig. 6.1 shows eggs in a turtle nest. Explain the role of migration in the life cycle of the leatherback turtle.
Answer this question and get it marked →May–June 2025, Paper 22
Fig. 3.1 shows an ocean food web. The web shows: dinoflagellates eaten by shrimps, mackerel and copepods; copepods eaten by mackerel; shrimps eaten by tuna; mackerel eaten by tuna…
Answer this question and get it marked →May–June 2025, Paper 23
Fig. 3.1 shows an ocean food web. Name one primary consumer in the food web shown in Fig. 3.1.
Answer this question and get it marked →