The primary type is derived from the growth of the apical meristem, while the secondary type is derived from the cambium.  
In conifers, this tissue is made up mainly of tracheids, thus presenting a uniform, nonporous appearance characteristic of softwood.  The primary type is derived from the growth of the apical meristem, while the secondary type is derived from the cambium.  It has several components, including the tracheids, which are elongated conduction and support cells, parenchyma cells for food storage, and woody fibers.  FTP, name this type of vascular tissue that conducts water and nutrients up from the roots.
In conifers, this tissue is made up mainly of tracheids, thus presenting a uniform, nonporous appearance characteristic of softwood.  
xylem