The circumference of a tree stem was measured continually for 48 hours.
The results are shown on the chart recording.
What explains the changes in circumference recorded during the 48 hours?
1 )
Adhesion forces decrease during the night.
Cohesive tension forces increase during the day.
3 )
Mass flow of sucrose increases during the night.
4 )
Root pressure decreases during the day.
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