Movement of Fluids in the Phloem
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10 Terms
Translocation
movement of sugars (and other organic molecules) in plants within the phloem
What are the other organic molecules that are moved in the phloem?
plant hormones, amino acids, and mRNA
What is the main sugar moved by translocation?
Sucrose
What types of sugar is sucrose?
A disaccharide made of glucose and fructose
Which direction does fluid move in the phloem?
Both directions
What do the companion cells need to load into sieve cells?
Energy and co-transport
How are sugars moved within the phloem?
They are moved by bulk flow
Source cell
high concentration of sugar
ex: leaves, bulbs, root, tubers
(where sugar is coming from)
Sink cell
cell that needs energy or stores the sugar
(where the sugar is going to)
The sink cells can be bulbs, roots, buds, seeds, or fruit depending on ….
the season
Note 
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