ANA SAYFA


PRESSURE FLOW MECHANISM
 
 
 
 
 
→The source cells produce sugar by photosynthesis.
 
→Then, the sugar transports into the phloem.
 
→This, causes to increase osmotic pressure within the phloem.
 
→Then, water enters from xylem into the phloem by osmosis.
 
This, causes to increase water pressure within the phloem.
 
→Then, water pressure forces the sugar to move toward the sink cells.
 
→Finally, sugars store as starch within the sink cells and water returns back to the xylem.
 
 
 
 
 
 
 
 
 
 
 
 
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