allery**Root pressure** can account for ascent of sap up to approximately:
A1 m
B10–20 m (insufficient for tall trees)
C50–100 m
DUnlimited heights
Answer & Solution
Correct answer: B. 10–20 m (insufficient for tall trees)
Root pressure (~1–2 bars) can push water up about 10–20 m.
Inadequate for taller trees (e.g. redwoods, eucalyptus 100+ m).
For those, cohesion–tension is the dominant mechanism.
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