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प्रश्न
Define the cohesive force.
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उत्तर
The intermolecular force of attraction between two molecules of the same material is called the cohesive force.
Example: The force of attraction between two water molecules.
संबंधित प्रश्न
What is responsible for guttation?
Define the term:
Plasmolysis
Name the following:
The inward movement of solvent molecules through the plasma membrane of the cell.
Name the following:
The process by which raisins swell up when placed in a beaker of water.
Give a diagrammatic representation of plasmolysis in a cell.
The diagram below represents an experimental set up to demonstrate a vital process. Study the same and then answer the questions that follow:
(i) Name the process.
(ii) Define the above named process.
(iii) What would you observe in the experimental setup after an hour or so?
(iv) What control experiment can be set up for the above experiment?
(v) Keeping in mind the root hair cell and its surrounding name the part that corresponds to (1) Concentrated sugar solution, (2) Parchment paper, (3) Water in the beaker.
(vi) Name any other substance that can be used instead of parchment paper in the above experiment.
(vii) Mention two advantages of this process to the plant.
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?
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.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
The plasma membrane permits the passage of all solutes and water.
Explain the term:
Plasmolysis
