Which statement explains why the circumference (girth) of a tree is less at midday and increases at night?
1 )
Mineral uptake by the root hair cells decreases during the night because root pressure has decreased.
2 )
Stomata close during the night and there is a build-up of water in the vascular tissue within the stem.
3 )
The phloem sieve tubes fill with dissolved solutes because the translocation rate reduces during the night.
There is less tension in the xylem vessels during the night because the rate of transpiration is at a minimum.
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