Pressure Data, Measured from One of the Vascular Tissue Types

Multiple Choice

Pressure data, measured from one of the vascular tissue types connecting leaf to root in a 11 m tall tree, is presented in the graph below. Which of the following is the most appropriate title for this graph?

A) xylem flow from root to leaf
B) xylem flow from leaf to root
C) phloem flow from root to leaf
D) phloem flow from leaf to root