The grey seal, Halichoerus grypus, is an aquatic mammal found in the North Atlantic Ocean. It eats fish, which it catches at depths of up to 70 metres. Fig. 10.1 displays a grey seal. Diving to catch fish affects the respiration of the grey seal. A study measured the blood lactate concentration of a grey seal before, during and after a dive in deep water.
(a)[4]
With reference to Fig. 10.2, suggest explanations for the change in the seal’s blood lactate concentration:
• during the dive
• after the dive.
(b)[3]
Some seal species are classed as endangered on the IUCN Red List of Threatened Species\u0000a2. Suggest methods by which seal species may be conserved.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “When exercise limits oxygen availability, anaerobic respiration increases and lactate builds up.” …