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प्रश्न
Give Reasons for the following.
Salt and sugar are used in preserving food.
उत्तर
Salt and sugar increase the concentration of food, destroying bacteria by plasmolysis.
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संबंधित प्रश्न
Differentiate between Diffusion and Osmosis (Definition)
Name the following:
The condition of a cell placed in a hypotonic solution.
When placed in a more concentrated solution, the cell contents will ______.
Name the following:
Movement of molecules from a region of high concentration to a region of low concentration.
A leaf cell of a water plant was placed in a liquid other than pond water. After sometime, it assumed a shape as shown below:
Redraw in the space provided, the diagram of the cell if it is soon placed in ordinary water for some time.
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?
Give Technical Term for the following.
The pressure which is responsible for the movement of water molecules across the cortical cells of the root.
Multiple Choice Question:
Osmosis involves:
Multiple Choice Question:
Plasma membrane controls:
