BISC208 Chapter Notes - Chapter 36: Active Transport, Soil Acidification, Root Hair
17 Dec 2017
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Stomata: specialized epidermal leaf structures that regulate gas exchange and h20/solute uptake: guard cells are attached to either end of it o. Once electrochemical gradient begins k+ and cl- enter the guard cells. H20 follows by osmosis and through aquaporins or water channels o. Binds to the receptors on the guard cells. Results from pressure build up in root systems. Excess water exits the plant under its liquid form through open pores (different from stomata) Process that drice the upward transport in plants o o. Carbon and oxygen are mainly absorbed from the air, while other nutrients dissolved in water are obtained from the soil. Micronutrients (we don"t need as much) o o. Some ions such as na+ and metal ions are passively excluded from passing into endodermal cells preventing them fro reaching the xylem. Other ions such as nitrate of ca2+ enter the symplast through selective channels.
