PREVENTION OF WATER ABSORPTION 35 



FIG. 3. UPPER, NORMAL PLANT CELL. LOWER, CELL 

 THAT HAS BEEN PlASMOLYZED. 



ration of water from the leaves also tends to concentrate 

 the cell-sap in the leaves. This continuous diluting in 

 the roots and concentration in the leaves causes a move- 

 ment of water from root cells upward toward the leaf 



