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?
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. 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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