Advertisements
Advertisements
Questions
What is the water potential?
Explain the term:
Water potential
Advertisements
Solution
Water potential is the measure of the tendency of water to move from one region to another, usually from an area of higher water potential to a lower water potential. It indicates the free energy of water in a system.
It is represented by the Greek letter psi (ψ). The unit of measurement of water potential is bars/pascals/atmospheres.
APPEARS IN
RELATED QUESTIONS
Osmosis and diffusion are the same except that osmosis there is:
The space between the cell wall and plasma membrane in a plasmolysed cell is filled with ______.
The bending movements of certain flowers towards the sun and the sleep movements of certain plants at night are examples of ______.
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.
Explain how soaked seeds swell up and burst their seed coats.
Show by a series of diagrams, the change which a plant cell will undergo when placed in
Hypertonic salt solution
Define the term:
Plasmolysis
Name the following:
The inward movement of solvent molecules through the plasma membrane of the cell.
Choose the correct answer:
Osmosis involves diffusion of ___________
Choose the correct answer:
Plasmolysis will occur when the cell is placed in a __________
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:
Name and define the physical process being investigated in this experiment.
Give Reasons for the following.
On sprinkling common salt on grass growing in a lawn, the grass is killed.
In the figure below ‘A’ shows a cell in the normal state and ‘B’ shows the same cell after leaving it in a certain solution for a few minutes.
(i) Describe the change which has occurred in the cell as seen in B.
(ii) Give the technical term for the condition of the cell as reached in B and as it was in A.
(iii) Define the process which led to this condition.
(iv) What was the solution-isotonic, hypotonic or hypertonic, in which the cell was kept?
(v) How can the cell in B, be brought back to its original condition?
(vi) Name the parts numbered 1 to 3.
Give a diagrammatic representation of plasmolysis in a cell.
The diagram given below is of an experiment just at the start. Study the diagram carefully and answer the following questions :
(i) What does the experiment demonstrate?
(ii) Define, the process demonstrated in the experiment.
(iii) What changes are observed after a few hours?
(iv) Give two examples of a semi-permeable membrane.
(v) Which limb of the U-tube contains a more concentrated sucrose solution, A or B?
(vi) Why is the membrane separating the two solutions labeled as semi-permeable membrane?
Given below is the figure of an experimental set up to demonstrate root pressure.
(i) Define root pressure.
(ii) What change would you observe in the water level after some time?
(iii) What role is being played by the root pressure in the given experiment?
(iv) Why the oil has been sprinkled on water?
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
During exosmosis, water moves from inside the cell to the outside of the cell.
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.
Define the following term:
Osmotic Pressure
Define the following term:
Tonicity
