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A-LevelBiologyTransport in plantsFeb/Mar 2016Paper 1 Q251 Mark

Which changes to the water potential and the volume of liquid in the phloem occur when sucrose is moved from the phloem sieve tube to an actively dividing root tip? [Figure 25.1]

Awater potential in phloem sieve tube becomes: less negative, volume of liquid in phloem sieve tubes: decreases
Bwater potential in phloem sieve tube becomes: less negative, volume of liquid in phloem sieve tubes: increases
Cwater potential in phloem sieve tube becomes: more negative, volume of liquid in phloem sieve tubes: decreases
Dwater potential in phloem sieve tube becomes: more negative, volume of liquid in phloem sieve tubes: increases

✓ Correct Answer

The correct answer is A: water potential in phloem sieve tube becomes: less negative, volume of liquid in phloem sieve tubes: decreases

📋 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 Feb/Mar 2016 examination, Paper 1 Variant 2.

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