Movement of phloem sap from a source to a sink ________.

Question

Quizplus · Accepted Answer

Phloem sap movement from a source (where sugars are produced or stored) to a sink (where sugars are used or stored) relies on a pressure flow mechanism, which is ultimately driven by the active transport of sugars into the phloem. This active transport process depends on the activity of proton pumps, which create a proton gradient that is used to co-transport sugars into the sieve-tube elements, generating osmotic pressure that drives the flow of sap.

Movement of Phloem Sap from a Source to a Sink