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प्रश्न
Define the cohesive force.
Define the term 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
Osmosis and diffusion are the same except that osmosis there is:
Two potato cubes each 1 cm3 in size, were placed separately in two containers (A&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 had somewhat decreased in size. Use the above information to answer the questions that follow:
Account for the firmness and increase in the size of the potato cubes placed in water.
Define the following:
Hypertonic solution
What do you mean by transpiration pull ?
Give Reasons for the following.
We gargle with saline water in case of throat infection.
Give a diagrammatic representation of plasmolysis in a cell.
In an experiment, two sets of apparatus were set up as shown below:
In A there is a concentrated sugar solution inside the thistle funnel and red ink in the water outside the funnel. In B there is a concentrated glucose solution with red ink inside the thistle funnel and water outside the thistle funnel.
In both A and B the level of liquid inside the funnels rises up the tubes. In A the sugar solution turns red and in B, the water turns red.
Study the given observations and answer these questions:
- Name the process by which red ink moves in A and B.
- Which type of pressure forces the water molecules to move towards thistle funnels and cause a rise in the water level?
- Where does this process occur in plants and animals?
- What material could be used as a semi-permeable membrane?
Fill in the Blank
When there is no movement of water in the cell from the outside medium, the medium is considered to be ______ to cell sap.
Multiple Choice Question:
Osmosis involves:
Define the following term:
Osmotic Pressure
