A-LevelBiologyTransport in plantsOct/Nov 2020Paper 1 Q231 Mark
Which combination of features is correct for a phloem sieve tube element as it unloads into a sink? [Figure 23.1]
Awater potential: higher than sink, lignified cell wall: absent
Bwater potential: higher than sink, lignified cell wall: present
Cwater potential: lower than sink, lignified cell wall: absent
Dwater potential: lower than sink, lignified cell wall: present
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The correct answer is A. This question tests the candidate's understanding of transport in plants within the Biologysyllabus. The examiner's mark scheme requires...
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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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