A-LevelBiologyTransport in plantsMay/June 2012Paper 1 Q251 Mark
Which statement explains why the circumference (girth) of a tree is less in the middle of the day than at night?
AMineral uptake by the root hair cells decreases during the night because root pressure has decreased.
BStomata close during the night and there is a build-up of water in the vascular tissue within the stem.
CThe phloem sieve tubes fill with dissolved solutes because the translocation rate is reduced at night.
DThere is less tension in the xylem vessels at night because the rate of transpiration is at a minimum.
✓ Correct Answer
The correct answer is D. 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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