When sucrose is loaded into the phloem, it must first move out of mesophyll cells, then into a companion cell, before reaching the phloem. In many plants, proton pumps and co-transporter molecules help to carry out this process. Which row indicates the relative concentrations of sucrose in each type of cell?
- 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