A-LevelBiologyTransport in plants9700/12 · Oct/Nov 2023 · 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

B: mesophyll cell: 5, companion cell: 15, phloem sieve tube element: 10

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Topic: Transport in plants, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2023 Paper 1 Variant 2, question 27.

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