, it is pointed out that land plants are descended from aquatic plants.The early aquatic plants required few modifications for structural support or water and nutrient absorption, since the surrounding water fulfilled their needs.Several types of analyses can be conducted using the equipment in the lab: The laboratory has constructed several reference series (ring width and wood density) for different regions of Quebec (one series in the St.
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Each year a tree’s growth ring has two parts; one is wide and light colored, and the other is narrow and dark. This grows during the wet spring and early summer when the tree has a lot of sap, and the cambium cells giving rise to the trunk growth are large and thin walled.
As the summer winds down and the transition to the cooler autumn occurs, the tree’s growth rate slows.
The cellssurrounding the pith differentiate to form the first xylem and phloem.
Division of the cells between the xylem and phloem give rise to the vascular cambium tissue.
Various techniques are used to CROSSDATE wood samples to assure accurate dating.