AS & A Level Marine Science (9693) — May–June 2025, Paper 41
6 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Fig. 1.1 is an electron micrograph of part of a cell from a salmon. The micrograph shows a mitochondrion labelled in the upper right area of the image. A circle is drawn on part…
Answer this question and get it marked →Endoriftia bacteria fix carbon by chemosynthesis. Endoriftia bacteria live inside giant tubeworms, Riftia. Describe the relationship between Riftia and Endoriftia.
Answer this question and get it marked →Oysters are shelled molluscs that have a complex life cycle. The adults are sessile organisms that anchor to a substrate. Fig. 3.1 shows some adult oysters — a photograph of…
Answer this question and get it marked →A student investigated if the surface area of fish gills has a correlation with the activity levels of the fish. The student used a Spearman's rank correlation to test if there…
Answer this question and get it marked →Fig. 5.1 shows a photograph of Palau, a nation located in the Pacific Ocean. Palau consists of a series of islands surrounded by a range of coral reefs. Reef fish are an important…
Answer this question and get it marked →Fig. 6.1 shows a photograph of a ship's rudder and propeller covered in barnacles. Antifouling paints are often used to prevent barnacle larvae settling on boats. Outline why many…
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