a slow process of movement of molecules, thus it alone can not meet requirement of transportation in complex organisms.

The protoplasm of each cell is surrounded by plasma membrane nembrane allows only certain molecules and ions to enter and leave toplasm freely, hence, the plasma membrane is said to be selectively 

eable. 

ee ater molecules can easily diffuse through the cell-membrane. osis is a process by which solvent molecules (water) diffuse across tively permeable membrane, from a region of low solute concentration ¢ high solute concentration. Due to osmosis water moves from one 

to another celi. It also maintains the turgidity of cells. With the help 

is process plants absorbs large quantity of water by roots. 

Active transport: . 

Most of the materials are normally transported due to concentration dient in and out of the cells but some materials are also transported inst the concentration gradient. This type of movement is called active nsport, Active transport requires energy which is supplied by ATP. It is Ne rapid than diffusion and osmosis. It helps to maintain ionic and water ince between cells and extra cellular fluids. 

The plasma membrane of the root hai?s use the energy of ATP to transport minerals from the soil water. 

Wrorcor 

cell sap present in the vacuole is a solution of salts and sugars, ant cell is surrounded by water, osmosis would take place and Suld enter the vacuole. Such extra water in the vacuole wan'd cause and push the cytuplasm against the cell-wall, which also becomes ‘etched. Such cell is said to be turgid and the condition thus nside the cell is called turgor. The oucward pressure exerted on by the fluid contents of the cell is called the turgor press 

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