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?

Q: What topic does this question test?

This question tests Transport in plants in A-Level Biology (syllabus code 9700). It is worth 1 mark.

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: There is less tension in the xylem vessels at night because the rate of transpiration is at a minimum.

📋 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.

🔒

Unlock the Examiner's Analysis

Join thousands of Cambridge students already using Oracle Prep

About This A-Level Biology Question

Topic

This multiple-choice question tests Transport in plants in A-Level Biology (syllabus code 9700). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Biology May/June 2012 examination, Paper 1 Variant 2.

Practice on Oracle Prep

Oracle Prep provides AI-powered practice for all Cambridge O-Level and A-Level subjects. Our platform includes topic predictions with 87.7% accuracy, AI essay grading, and a comprehensive question bank spanning 25 years of past papers across 29 subjects.