A-LevelBiologyTransport in plantsOct/Nov 2023Paper 1 Q271 Mark
When sucrose is loaded into the phloem it has to travel from mesophyll cells to a companion cell and then into the phloem. Which row shows the relative concentrations of sucrose in each type of cell in order for this process to take place?
Amesophyll cell: 5, companion cell: 10, phloem sieve tube element: 15
Bmesophyll cell: 5, companion cell: 15, phloem sieve tube element: 10
Cmesophyll cell: 15, companion cell: 10, phloem sieve tube element: 5
Dmesophyll cell: 15, companion cell: 5, phloem sieve tube element: 10
✓ Correct Answer
The correct answer is B. 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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