Sucrose is transported in solution in the phloem of plants. Transport takes place from sources to sinks. The process depends on differences in hydrostatic pressure between the sources and the sinks. [Figure 26.1] Which tissues are either a source or a sink and what is the hydrostatic pressure at X and Y within the phloem?
✓ Correct Answer
The correct answer is C: leaf: source, root: sink; high hydrostatic pressure: X, low hydrostatic pressure: Y
📋 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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