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प्रश्न
Define the following term:
Tonicity
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उत्तर
The relative concentration of the solutions that determines the direction and extent of diffusion is called tonicity.
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संबंधित प्रश्न
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?
Give the appropriate biological or technical term for the following.
Movement of molecules of a substance from their higher concentration to lower concentration when they are in direct contact.
A plant cell placed in a certain solution got plasmolysed. What was the kind of solution?
The following diagram represents a plant cell after being placed in a strong sugar solution.
Guidelines 1 to 5 indicate the following
(1)Cell wall, (2) Strong sugar solution, (3) Protoplasm (4) Large vacuole, (5) Nucleus
(1)What is the state of the cell shown in the cell shown in the diagram?
(2)Name the structure which acts as a selectively permeable membrane.
(3)If the cell had been placed in distilled water instead of strong sugar solution, which feature would not have been seen?
(4)Name any one feature of this plant cell which is not present in an animal cell.
Define the following:
Osmosis
Define the following:
Hypertonic solution
The beaker is divided into two chambers A and B. The big circle represents solute and the small circles solvent.
(i) What can you say about the size of the holes in the membrane, if it is to behave semi- permeably between these two?
(ii) Will the solvent molecules pass through the membrane from left to right, from right to left, in either direction or in both directions?
(iii) In which direction will there be a net movement of solvent molecules?
Give Technical Term for the following.
A solution whose concentration is greater than that of the cell sap.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Osmosis is defined as the movement of water from a concentrated sugar solution to a dilute sugar solution.
