It is generally agreed that the green plant can build them up for its own needs in leaves exposed to the ... these are the wood or xylem, and the phloem or bast. Usually, the sieve-tubes of ...

Xylem cells transport water from the roots to other parts of the plant. Phloem cells transport sugary water from the leaves to the rest of the plant. Xylem cells run inside stems of plants from ...

The center of a tree or shrub stem (from roots to trunk, branches, and twigs) is woody, composed of xylem cells that conduct water from the roots to the upper parts of the tree. That woody section is ...