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प्रश्न
In the figure below ‘A’ shows a cell in the normal state and ‘B’ shows the same cell after leaving it in a certain solution for a few minutes.
(i) Describe the change which has occurred in the cell as seen in B.
(ii) Give the technical term for the condition of the cell as reached in B and as it was in A.
(iii) Define the process which led to this condition.
(iv) What was the solution-isotonic, hypotonic or hypertonic, in which the cell was kept?
(v) How can the cell in B, be brought back to its original condition?
(vi) Name the parts numbered 1 to 3.
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उत्तर
(i) Exosmosis (exit of water) has resulted in the shrinkage of the protoplasm of cell B.
(ii) Plasmolysis and deplasmolysis.
(iii) When plant cells are kept in a hypertonic solution, exosmosis takes place. This process is called plasmolysis.
(iv) Hypertonic solution.
(v) The cell in B can be brought back to its original condition by placing it in a drop of distilled water.
(vi) 1. Cell wall, 2. Plasma membrane, 3. Chloroplast.
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संबंधित प्रश्न
Give appropriate biological or technical terms for the following :
Movement of molecules of a substance from their higher concentration to lower concentration when they are in direct contact.
Mention whether the following statement is true or false. Correct the false statement by altering the last word only.
The shrinkage of protoplasm, when a cell is kept in hypotonic solution.
Two potato cubes each 1 cm3 in size, were placed separately in two containers (A and B), the container A having water and the other (B) containing concentrated sugar solution. After 24 hours when the cubes were examined, those placed in water were found to be firm and had increased slightly in size and those placed in concentrated sugar solution were found to be soft and somewhat decreased in size. Use the above information to answer the questions that follow:
Account for the softness and decrease in size of the potato cubes which were placed in sugar solution.
A plant cell kept in a drop of water was examined under the low power magnification of a microscope, as shown:
(i) What would you do to bring this cell back to its original condition?
(ii) What scientific term is used for such condition?
(iii) Draw the same cell if it is kept in a strong sugar solution.
Give Technical Term for the following.
A solution whose concentration is greater than that of the cell sap.
Name the following:
Name the process by which water enters the root hair cell.
Multiple Choice Question:
Plasma membrane controls:
Explain the Term:
Osmosis
The given statement is incorrect. Rewrite the correct statement:
Fresh water fish when placed in hypertonic salt solution absorb water and burst.
