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Xylem is a type of vascular tissue in plants. There are both xylem and phloem that operate to move material thru the plant.

the Xylem are like tubes that carry water and minerals up from the roots of the plant.

the Phloem on the other hand are tubes that distribute sugars, amino acids and other organic stuffs.

but specifically in the LEAF (from wiki:)

"Transpirational pull: the most important cause of xylem sap flow is the evaporation of water from the surfaces of mesophyll cells to the atmosphere. This transpiration causes millions of minute menisci to form in the mesophyll cell wall. The resulting surface tension causes a negative pressure or tension in the xylem that pulls the water from the roots and soil."

...meaning basically: when the water evaporates off the leaf (mesophyll layer) it causes a lower pressure in the xylem and so that pressure actually "pulls" the water from the roots to the surface. so basically it shows one way in which the xylem tube functions: by transpirational (=>evaporative) pull.

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14y ago

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What is the scientific term for the vein of the leaf?

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