A heating sleeve was placed around the trunk of a small tree at a height of 1 m above the ground.
This allowed a narrow region of the tree trunk to be heated to ${60^ \circ }C$.
How will heating this region to ${60^ \circ }C$ affect the transport of phloem sap and xylem sap between the roots and leaves?

1 )
A
2 )
B
C
4 )
D
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