A-LevelBiologyControl and coordinationMay/June 2024Paper 5 Q211 Marks
Gibberellins are a group of plant hormones that are involved in the elongation of plant stems. A student investigated the effect of two different concentrations of a gibberellin, known as GA₃, on stem elongation of 10-day old pea seedlings. The student was given a stock solution of GA₃ with a concentration of 2.85 × 10⁻⁴ moldm⁻³.
📋 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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