Xylem in Biological Definition

Phloem

... from the Greek word for "bark". See also xylem . Phloem sap moves from sugar source s to ... movement in phloem is bidirectional, wheras in xylem cells, it is unidirectional (upward). After ... While movement of water and minerals through the xylem is driven by negative pressures (tension) most of ...

Xylem

... vessel elements In vascular plants , the xylem is the tissue that carries water up the root ... , "wood, timber". Together with the phloem , the xylem is one of the two types of transport tissues in plants. The cell walls of xylem cells derive most of their strength from ...

Leaf

... pattern formation through ramification. The veins are made up of: xylem , which brings water from the stem into the leaf. phloem , which ... containing the glucose produced by photosynthesis in the leaf. The xylem typically lies over the phloem. Both are embedded in a dense parenchyma ...

Biological tissue

... , spinal cord and peripheral nervous system Examples of tissue in other multicellular organisms are vascular tissue in plants , such as xylem and phloem . Plant tissues are categorized into the parenchyma , the collenchyma , and the sclerenchyma . ...

Endodermis

... suberin mainly, a waxy substance which prevents water from flowing back into the soil. Water is thus forced toward the center of the root, into the xylem , where it is then transported into the rest of the plant. ...