A-LevelBiologyTransport in plantsMay/June 2012Paper 1 Q261 Mark
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?
Aleaf: sink, root: source; high hydrostatic pressure: X, low hydrostatic pressure: Y
Bleaf: sink, root: source; high hydrostatic pressure: Y, low hydrostatic pressure: X
Cleaf: source, root: sink; high hydrostatic pressure: X, low hydrostatic pressure: Y
Dleaf: source, root: sink; high hydrostatic pressure: Y, low hydrostatic pressure: X
✓ Correct Answer
The correct answer is C. This question tests the candidate's understanding of transport in plants within the Biologysyllabus. The examiner's mark scheme requires...
📋 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...
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