Which statement supports the theory of active loading of sucrose into companion cells?
The pH decreases in the cell wall of the companion cells compared to the cytoplasm.
2 )
The pH decreases in the cytoplasm of the companion cells compared to the cell wall.
3 )
The pH decreases in the plasmodesmata between companion cells and sieve tube elements.
4 )
The pH decreases in the sieve tube elements compared to the companion cells.
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