A-LevelBiologyInfectious diseasesMay/June 2017Paper 2 Q39 Marks
Malaria is a disease caused by the protoctist, Plasmodium. The organism has a very complex life cycle as it has two hosts, a human and a mosquito. [Figure 3.1 is a transmission electron micrograph showing the developing Plasmodium cells inside a protective structure known as an oocyst. In this stage of the life cycle the oocysts are found in the mosquito gut. When mature, the Plasmodium cells are released and travel to the salivary glands of the mosquito. 20 μm]
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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