Xylem, continued | Tree Biology
This second video about xylem covers: the spring/early wood and summer/late wood in annual rings what ring porous and diffuse porous means (gymnosperms are "non porous because they don't have vessels) fibers and parenchyma, non-conducting cells in xylem rays, which are made of ray parenchyma resin ducts in conifers are used for defense cellulose & lignin as the primary polymers in plants
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