A-LevelBiologyTransport in plantsFeb/Mar 2019Paper 1 Q241 Mark

Which combination of features is characteristic of a phloem sieve tube element as it is loaded from a source?

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.

Awater potential of the phloem sieve tube element: less negative than source, lignification of the cell wall: absent

Bwater potential of the phloem sieve tube element: less negative than source, lignification of the cell wall: present

Cwater potential of the phloem sieve tube element: more negative than source, lignification of the cell wall: absent

Dwater potential of the phloem sieve tube element: more negative than source, lignification of the cell wall: present

✓ Correct Answer

The correct answer is C: water potential of the phloem sieve tube element: more negative than source, lignification of the cell wall: absent

📋 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 2019 examination, Paper 1 Variant 2.

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