Class 9 Exam > Class 9 Notes > Extra Documents & Tests for Class 9 > Viva Voce: Osmosis in Raisins
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Q.1. What is a hypertonic solution?
When the concentration of a solute in solution is more than the concentration of cell-sap, it’s called hypertonic.
Q.2. Give two functions of osmosis.
- Plant root cells absorb water by osmosis.
- The unicellular organisms like amoeba takes in the required material by osmosis.
Q.3. What will happen to the grapes if they are kept in isotonic solution?
The size of cell (grapes) will remain the same.
Q.4. What is osmosis?
Flow of solution from higher water concentration to lower concentration is called osmosis. The exchange of molecules takes place through the semi-permeable membrane.
Q.5. What is endosmosis?
When the water enters the cell from the medium, it is called endosmosis.
Q.6. How do roots absorb water?
By osmosis.
Q.7. What is exosmosis?
When the water leaves the cell and enters into the medium, the cell shrinks and it is called exosmosis.
Q.8. What will happen if a raisin is dipped in a hypotonic solution?
The raisin will absorb water by osmosis and swell.
Q.9. What will happen to a cell if it is kept in a hypertonic solution?
The cell will shrink and become smaller in size, it loses water due to exosmosis.
Q.10. Give two examples of semi-permeable membrane.
Plasma membrane.
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