⭐please give me the notes of chaptre transportation in plants
Answers
Translocation : Transport of substances in plants over longer distances through the vascular tissue (Xylem and Phloem) is called translocation.
Means of transport : The transport of material into and out of the cells is carried out by a number of methods. These are diffusion, faciliated diffusion and active transport. Diffusion : Diffusion occurs from region of higher concentration to region of lower concentration across the permeable membrane. It is passive and slow process. No energy expenditure takes place.
Facilitated diffusion : The diffusion of hydrophilic substances along the concentration gradient through fixed membrane transport protein without involving energy expenditure is called facilitated diffusion. For this the membrane possess aquarporins and ion channels. No energy is utilized in this process.
Facilitated diffusion : The diffusion of hydrophilic substances along the concentration gradient through fixed membrane transport protein without involving energy expenditure is called facilitated diffusion. For this the membrane possess aquarporins and ion channels. No energy is utilized in this process.
Active transport : Active transport is carried by the movable carrier proteins (pumps) of membrane. Active transport uses energy to pump molecules against a concentration gradient from a low concentration to high concentration (uphill-transport). It is faster than passive transport.
Water potential : The chemical potential of water is called water potential. It is denoted by ? (Psi) and measured in pascals (Pa). The water potential of a cell is affected by solute potential (? W s ) and pressure potential (? ). ? W = ? s + ? p Water potential of pure water at standard temperature which is not under any pressure is taken to be zero (by convention). p
" Osomosis "
Osmosis is movement of solvent or water molecules from the region of their higher diffusion pressure or free energy to the region of their lower diffusion pressure or free energy across a semi-permeable membrane. Water molecules move from higher water potential to lower water potential until equilibrium is reached. Plasmolysis : Process of shrinkage of protoplasm in a cell due to exosmosis in hypertonic solution.
" Casparian strip "
It is the tangential as well as radial walls of endodermal cells having the deposition of water impermeable suberin. Imbibition : Imbibition is the phenonmenon of adsorption of water or any other liquid by the solid particles of a substance without forming a solution.