Even in the absence of transpiration, some water can move into the roots and partially up the xylem columns. This phenomenon is due to  

A.  flooding.
B.  stomatal opening.
C.  root pressure.
D.  proton pumps.
E.  phloem translocation.


C.  root pressure.
Root pressure is due to osmosis in the roots. The roots continue to accumulate ions even when the plant is not transpiring. Because the roots have such a high ion concentration, water enters via osmosis and enters the xylem.

Biology & Microbiology

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