a.evaporation of water and active transport of sucrose from the sink.
b.osmotic movement of water into the sucrose loaded sieve-tube elements, creating a higher perssure in the source than in the sink.
c.tension created by the differences in pressure in the source and sink
d.active transport of sucrose through the sieve-tube cells driven by proton pumps
e.the hydrolysis of starch to sucrose in the mesophyll cells that raises their water potential and drives the bulk flow of sap to the sink.
b.osmotic movement of water into the sucrose loaded sieve-tube elements, creating a higher perssure in the source than in the sink.
c.tension created by the differences in pressure in the source and sink
d.active transport of sucrose through the sieve-tube cells driven by proton pumps
e.the hydrolysis of starch to sucrose in the mesophyll cells that raises their water potential and drives the bulk flow of sap to the sink.
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It's B. That is what osmosis does.