The phloem tubes
- Plants transport food and water around inside them using two
- different sets of tubing; xylem and phloem. They usually run along side each other and are called the leaf vein or vascular bundle
(or sieve tubes) are made up of living cells with a filters running through, and carries food from the leaves (where it is made) to everywhere else. They carry sugars, fats, proteins and other things like that to growing regions in shot and root tips, and to/from storage organs in the roots. They need a good supply of oxygen, otherwise they will die
- Xylem tubes (or vessels) are made of dead cells joined end to end. The walls of dead cells are stiff and contain lignin, which gives the plant support. They carry water and minerals from the roots to the leaves
- using the pressure of the transpiration stream and root pressure. Minerals are also transported with the water. In the roots, the xylem takes in water using root hairs to increase the surface area. The concentration of salt in the root hair is higher than in the soil, so
- water is drawn in by osmosis NB both extend down to the roots.