Which statement about sucrose loading into companion cells and then into the phloem sieve tube element is not correct?
1 )
Hydrogen ions and sucrose molecules move into the companion cells using a carrier protein.
2 )
Hydrogen ions are pumped out of the companion cells by active transport.
Sucrose molecules are carried into the companion cells down the concentration gradient for sucrose.
4 )
Sucrose molecules move from a companion cell into the sieve tubes of the phloem through plasmodesmata.
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