AP Biologymediummcq1 pt
Water moves up a tall tree mainly because of
A.cohesion and adhesion plus transpiration pull
B.root pressure alone
C.active transport of water by xylem cells
D.gravity pulling water upward
Explanation
Core Concept
Evaporation from leaves pulls the water column; cohesion keeps water molecules linked while adhesion grips xylem walls. The combined transpiration-cohesion-tension mechanism lifts water meters high.
Correct Answer
Acohesion and adhesion plus transpiration pull
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