Unformatted text preview: The presence of sugar in a sieve tube attracts water. • Water moves into the sieve tube from adjacent xylem cells increasing the pressure in the sieve tube • Increased pressure forces the solutes into the next cell of the sieve tube. This mechanism is called pressure flow, a type of bulk flow. Active transport (cotransport with proton pumps) is again used at the sink, to move the solutes into the cells where they will be needed or stored....
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- Fall '09
- Plants, phloem, Xylem, Vascular plant, sieve tube