Question

Put raisins in plain water and leave them for some time. Then place them in concentrated solution of sugar and salt. What do you observe in both cases?

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Answer 1

in plain water the raisins would soak and be puffed due to oxygen entering into the raisins and whereas in concentrated solutions it will shrink due to air escaping out

Answer 2

Answer:

We will observe the phenomenon of osmosis in both cases.

Explanation:

• Osmosis refers to the passage of solvent molecules from a region of their higher concentration to the region of their lower concentration through a differentially permeable membrane.

• The solvent in all biological systems is water. Thus we can say osmosis is the diffusion of water through a differentially permeable membrane.

• When we put raisins in plain water and leave them for some time, they swell up due to the entry of water inside them.  
• Since pure plain water is a hypotonic (Concentration of a solution is less than the cell sap) solution, when we put raisins in it, water moves in (endosmosis) and resulted in an increase in size.

• While we put them in a concentrated solution of sugar and salt, i.e. hypertonic (concentration of a solution is more than the cell sap)solution, water will diffuse out (Exosmosis) of it. This will result in shrinkage of it.

Therefore we will observe both the phenomenon i.e. endosmosis & exosmosis respectively.

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