A-LevelBiologyTransport in plantsFeb/Mar 2024Paper 1 Q291 Mark
A maize seedling was grown in soil that contained lanthanum ions labelled with a chemical that fluoresces under ultraviolet light. The diagram represents what was observed when a section of root was examined using a light microscope with ultraviolet illumination. [Figure 29.1] What is a correct conclusion about the transport of lanthanum ions in maize roots?
AThe ions are not transported through the apoplast pathway or the symplast pathway.
BThe ions are transported through the apoplast pathway only.
CThe ions are transported through the apoplast pathway and symplast pathway.
DThe ions are transported through the symplast pathway only.
✓ Correct Answer
The correct answer is B. 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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