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A-LevelBiologyTransport in plantsMay/June 2019Paper 1 Q261 Mark

Sucrose moves from a mesophyll cell in a leaf into a phloem sieve tube element. Which changes to the water potential and the volume of liquid in the phloem sieve tube element are correct?

Awater potential becomes: less negative, volume of liquid: decreases
Bwater potential becomes: less negative, volume of liquid: increases
Cwater potential becomes: more negative, volume of liquid: decreases
Dwater potential becomes: more negative, volume of liquid: increases

✓ Correct Answer

The correct answer is D: water potential becomes: more negative, volume of liquid: increases

📋 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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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 2019 examination, Paper 1 Variant 2.

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