Sucrose is loaded into phloem sieve tubes from companion cells.
What is the correct order of statements that explains this mechanism?
1- Hydrogen ions diffuse into companion cells through co-transporter proteins.
2- Hydrogen ions are pumped out of companion cells by active transport.
3- Sucrose diffuses into phloem sieve tubes via plasmodesmata.
4- Sucrose is co-transported along with hydrogen ions.
1 )
$1 \to 2 \to 4 \to 3$
2 )
$1 \to 4 \to 2 \to 3$
$2 \to 1 \to 4 \to 3$
4 )
$4 \to 1 \to 2 \to 3$
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