Sunday, April 22, 2012

Delivery for the Chau Family: Water!

Here is a crude drawing representing transpiration, or the process of losing water, similar to evaporation.

Turgor pressure pushes the plasma membrane against the cell wall of plant, bacteria, and fungi cells as well as those protist cells which have cell walls. This pressure is caused by the osmotic flow of water from area of low solute concentration outside of the cell into the cell's vacuole, which has a higher solute concentration. Below is a great diagram showing the movement of water.
Vascular tissue are found in vascular plants and the complex transports food and water inside of the plant. It is consisted of two components, the Xylem and the Phloem. The xylem is a long tracheary element that transports water. Xylem tend to have thick secondary cell walls, often deposited unevenly in a coil-like pattern so that they may stretch. More on the phloem in  the food section. 

The stomata is a pour in the plant that is used fro gas exchange, they are bordered by guard cells, which regulate the size of the opening, kind of like a door opener. The stomata's structure allows for it to easily open and close, kinda like a mouth. 

Another way to get food and water is through the soil. Soil helps plants station themselves against the weather but it also helps them collect water and provides nutrients to the plant.

The Casparian strip is a band of cell wall material deposited on the radial and transverse walls of the endodermis, which is chemically different from the rest of the cell wall. It is used to block the passive flow of materials, such as water and solutes into the stele of a plant. It forces water through the endodermal cell in a way that it regulates the amount of water entering the xylem.












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