Which sequence of events could lead to mass flow in a phloem sieve tube?
1) Sucrose moves into a sieve tube element.
2) Protons (${H^ + }$) and sucrose molecules move into a companion cell through a co-transporter protein.
3) A very high hydrostatic pressure is produced.
4) The water potential of the sieve tube element decreases.
5) Protons (${H^ + }$) are actively pumped out of a companion cell.
6) Water moves down a water potential gradient by osmosis.
1 )
1 $ \to $ 2 $ \to $ 5 $ \to $ 6 $ \to $ 4 $ \to $ 3
2 )
3 $ \to $ 1 $ \to $ 2 $ \to $ 5 $ \to $ 6 $ \to $ 4
3 )
3 $ \to $ 5 $ \to $ 1 $ \to $ 2 $ \to $ 4 $ \to $ 6
5 $ \to $ 2 $ \to $ 1 $ \to $ 4 $ \to $ 6 $ \to $ 3
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