Advertisements
Advertisements
Question
Give Reasons for the following.
Freshwater fish cannot survive in seawater.
Advertisements
Solution
The seawater is saline (having more concentration of salts) and acts as a hypertonic solution for the freshwater. So freshwater fish cannot survive in seawater as it causes the plasmolysis of the cells of the fish and ultimately the fish will die.
APPEARS IN
RELATED QUESTIONS
A candidate in order to study the process of osmosis has taken 3 potato cubes and put them in 3 different beakers containing 3 different solutions. After 24 hours, in the first beaker the potato cube increased in size, in the second beaker the potato cube decreased in size and in the third beaker there was no change in the size of the potato cube. The following diagram shows the result of the same experiment:
(i) Give the technical terms of the solutions used in beakers, 1, 2 and 3.
(ii) In beaker 3, the size of the potato cube remains the same. Explain the reason in brief.
(iii) Write the specific feature of the cell sap of root hairs which helps in absorption of water.
(iv) What is osmosis?
(v) How does a cell wall and a cell membrane differ in their permeability?
(a) Mention whether the following statement is true (True) or false (False)
(b) Correct the false statement by altering the last word only.
A plant cell placed in hypotonic solution gets Plasmolysed.
Show by a series of diagrams, the change which a plant cell will undergo when placed in
Hypertonic salt solution
Define the following:
Diffusion
Explain why:
The leaves of wilted lettuce, if kept in cold water, become crisp.
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.
Multiple Choice Question:
In the process of osmosis in a cell:
During a practical exam, a plant cell in a particular solution was placed under a compound microscope. Students were told to observe the cell and name the tonicity of the solution and mention the process that occurred in the cell.
The given statement is incorrect. Rewrite the correct statement:
Fresh water fish when placed in hypertonic salt solution absorb water and burst.
