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Friday, October 26, 2012

Osmosis (Short Note)

Friday, October 26, 2012 - 2 Comments

Osmosis is a process by which solvent molecules (water) diffuse across selectively permeable membrane, from a region of low solute concentration to the high solute concentration. Due to osmosis water moves from one cell to another cell. It also maintains the turgidity of cells. With the help of this process plants absorbs large quantity of water by roots.

Diffusion (Short Note)

It is the movement of molecules from the area of higher concentration to the area of lower concentration. A few substances freely diffuse across the cell membrane. For example oxygen, carbon dioxide, diffuse in and out of the cells.

Diffusion is an essential step in the biological processes like photosynthesis, respiration etc. During stomatal transpiration, water vapours from the intercellular spaces escape out in the outer atmosphere by this process.

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