Discuss the ‘sink’ to ‘source’ transition during phloem unloading.

The "sink" to "source" transition during phloem unloading is a crucial process in plants where stored sugars and other solutes are transported from regions of lower metabolic demand (sinks) to regions of higher metabolic demand (sources). This transition involves the movement of nutrients from storage sites to actively growing or metabolically active parts of the plant. Let's delve into the process in more detail:

1. Sink and Source: In plants, "sinks" refer to areas where sugars and nutrients are used or stored, such as growing leaves, developing fruits, roots, and storage organs. "Sources" are regions where sugars are _________ ________ ____ _______ ____ _____ _________ ________.
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