Plants

Transpiration is the evaporation of water through the stomata in plant surfaces especially the underside of leaves

water moves through the plants from the roots to the stems and out of the leaves in the transpiration stream,

1) water enters roots by osmosis or diffusion into root hair cells that have large surface area.

2) water passes by osmosis down the water concentration gradient through the cells of the cortex and into xylem

3) In the xylem, water molecules are held together by the force of cohesion

The force of adhesion attracts water to the walls of the xylem

These two forces ensure that the treads of water present in the xylem vessels do not break.

4) water evaporates from leaf cells into the air spaces of leaves

5) The water vapour then diffuses into the atmosphere through the stomata

	Criado por xo quase 11 anos atrás

Notas sobre Xerophites, criado por xo em 05-01-2014.