As the plant grows, stem cell clusters called meristems generate new xylem cells, which form bigger pipes to suit the plant’s needs. After water flows from the roots to the leaves through the ...

As water travels through the xylem in the stem and leaf, it is being replaced by water taken up by the roots. Temperature Increases An increase in temperature increases evaporation, so the rate of ...

As water travels through the xylem in the stem and leaf, it is being replaced by water taken up by the roots. Photosynthesis produces glucose in the green parts of plants, which are often leaves.

A fossilized stem of Dernbachia brasiliensis, a tree fern of the Permian (250-300 million years ago). Water-conducting xylem tissue is highlighted in blue. Disclaimer: AAAS and EurekAlert!