HYPOTONIC , ISOTONIC AND HYPERTONIC SOLUTION

By Er. Anoop Dhiman5 Comments

HYPOTONIC, ISOTONIC AND HYPERTONIC SOLUTIONS

HYPOTONIC SOLUTION

If the medium surround the cell has higher water concentration than the medium  inside the cell. Then the water moves inside the cell by the process endo-osmosis. Such a medium is called hypotonic solution.

ISOTONIC SOLUTION

If the medium surround the cell has same water concentration as the medium inside the cell. Then there will no movement of water takes place through the cell membrane. Such a membrane is called isotonic solution.

HYPERTONIC SOLUTION

If the medium surround the cell has lower water concentration than the medium  inside the cell. Then the cell lose water by the process exo-osmosis. Such a medium is called hypotonic solution.

Q: What happens when a cell is placed in

(i) Hypotonic solution

(ii)Isotonic solution

(iii)Hypertonic solution

Ans: (i) when a cell is placed in hypertonic solution then water from the outside region moves inside the cell by the process endo-osmosis and the cell will swell up.(As shown in the fig above)

 

(ii) When a cell is placed in isotonic solution then there is no net movement of water in and out of the cell takes place and the size of cell remain same.(As shown in the fig above)

 

(iii) When a cell is placed in hypertonic solution then the cell lose inside water by the process exo-osmosis and the cell will shrink.(As shown in the fig above)

NOTE: When we dissolve water in a solution then it decreases its water concentration in  it.

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QUESTIONS FOR SELF EVELUATION

  1. The process exosmosis takes place when a cell is placed in ………………….Solution.
  2. The process endosmosis takes place when a cell is placed in ………………solution.
  3. No net movement of water takes place when a cell is placed in ……………solution.
  4. What happen when a cell in placed in  (a) Distilled water   (b) Salt Solution.

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