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प्रश्न
Define the term:
Plasmolysis
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उत्तर
संबंधित प्रश्न
Mention whether the following statement is true or false. Correct the false statement by altering the last word only.
The shrinkage of protoplasm, when a cell is kept in hypotonic solution.
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:
Osmosis
Name the following:
The pressure with which the molecules of a substance diffuse.
Name the following:
Condition of cell in which the cell contents are shrunken.
Explain why:
We gargle with saline solution in case of throat infection.
Choose the correct answer:
Cell turgidity is caused by _______________
Two potato cubes each 1 cm3 in size, were placed separately in two containers (A and 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 somewhat decreased in size. Use the above information to answer the questions that follow:
Account for the softness and decrease in size of the potato cubes which were placed in sugar solution.
Define the Cohesive and Adhesive forces.
Give Reasons for the following.
We gargle with saline water in case of throat infection.
Give Reasons for the following.
Freshwater fish cannot survive in seawater.
Differentiate between:
Osmosis and Diffusion
Differentiate between the following
Endosmosis and Exosmosis
A plant cell kept in a drop of water was examined under the low power magnification of a microscope, as shown:
(i) What would you do to bring this cell back to its original condition?
(ii) What scientific term is used for such condition?
(iii) Draw the same cell if it is kept in a strong sugar solution.
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.
Solutions which have the same osmotic pressure.
Name the following:
The movement of a liquid through a selectively permeable membrane.
Fill in the Blank
A plasmolysed cell has __________ protoplast.
