Water and nutrients must go to all organs of the plant, so the entire plant is permeated with conductive tissues. Water with dissolved minerals (from the soil) moves through the vessels of wood, a solution of organic substances (from leaves) moves through the sieve tubes of the bast.
Conductive tissues are combined into vascular-fibrous bundles, often surrounded by strong fibers of mechanical tissue. Vascular fibrous bundles run along the entire stem, connecting the root system to the leaves.
Movement of water with minerals (upward current)
The movement of water with minerals dissolved in it in the plant goes along the vessels of the wood in an ascending direction: from bottom to top. It depends on the strength of water absorption by the cells of the root hairs at the bottom and on the intensity of evaporation at the top.
The roots, absorbing water from the soil, together with it constantly bring dissolved mineral salts into the body. Having entered the plant with water, the salts do not evaporate, but remain in it, forming the so-called dry matter. The accumulation of dry matter in the body of a plant is the result of the joint work of roots and leaves.
The ascending flow of water in the plant unites all plant organs into a single whole. In addition, it is necessary for the normal water supply of all cells. It is especially important for the implementation of the process of photosynthesis in leaves.
Movement of organic matter
Organic substances (carbohydrates) formed in the leaves enter all plant organs through the sieve cells of the bast. Moreover, they can move both up and down.
Knowing how nutrients move in a plant, a person can control their movement. For example, if you cut off the lateral shoots of tomatoes and grapes, you can direct those organic substances to the fruits that would be used in the development of distant shoots. This will speed up the ripening of the fruit and increase the yield.