The graph shows the diameter of a tree trunk at different times.
Which statement is correct?
1 )
X shows the expansion of the trunk as water fills the xylem during transpiration.
2 )
Y shows a reduction in diameter of trunk as water is lost from the xylem due to transpiration.
Y shows a reduction in diameter of trunk due to water held in tension in the xylem.
4 )
Z shows the expansion of the trunk as the phloem tissue acts as a sink at night.
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