Question

Describe photo assimilate loading and off-loading in plants?

Answer 1

The below mentioned article provides an useful note on the phloem loading and unloading in plants. ... On the other hand, the transfer of sugars (photosynthetic) from sieve tube elements to the receiver cells of consumption end (i.e., sink organs) is called as phloem unloading. Both are energy requiring processes.
Sugars move up and down the plant in the phloem. The phloem uses active transport to transport the food nutrients like glucose and amino acids around the plant. Glucose is made in the leaves by photosynthesis. Glucose is converted into sucrose in the leaves, which then enters the phloem vessels, as do amino acids.

Answer 2

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Source loading and sink unloading of sugars, amino N compounds and potassium largely account for phloem sap osmotic concentrations.