Xylem: nm The xylem is a conductive tissue of raw sap made up of cells that have died at the end of their differentiation (tracheids, woody vessels, fibers) and living cells (vertical parenchyma cells, contact cells and reserve cells). It allows the circulation of the raw sap conducted from the roots to the photosynthetic organs and made up of water and mineral elements taken from the growing medium. See: Phloem ....
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