The diagram shows a dendrograph fixed to a tree. The dendrograph records changes in the diameter of the tree.
Some results are shown on the chart recording.
What explains the diameter changes recorded during the day and night?
cohesive tension forces increased during the day
2 )
mass flow of sucrose increased during the night
3 )
root pressure decreased during the day
4 )
thermal expansion and contraction of water in the tree
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