Question

While cooking any vegetable when we put some salt the vegetable releases water. What mechanism is responsible for this ? Explain briefly .

Answer 1

It is the osmosis process- the net movement of water across a semi-permeable membrane from an area of low solute concentration to another area with a high solute concentration. This is why water moves out from the vegetable

Answer 2

While doing cooking, generally we add salt to vegetables ( contains water). Adding salt, makes the concentration of salt higher in outside membrane of vegetables than in inside. ( more salt, less water) 
As a result, due the process of OSMOSIS, water from vegetables comes outside making it softer and helps in faster cooking..
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Hope this will help you