Advertisements
Advertisements
प्रश्न
What is the water potential?
Explain the term:
Water potential
Advertisements
उत्तर
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
संबंधित प्रश्न
The most appropriate characteristic of a semipermeable membrane is that
Mention whether the following statement is true or false. Correct the false statement by altering the last word only.
Addition of salt to pickles prevents growth of bacteria because they turn turgid.
The following diagram represents a plant cell after being placed in a strong sugar solution.
Guidelines 1 to 5 indicate the following
(1)Cell wall, (2) Strong sugar solution, (3) Protoplasm (4) Large vacuole, (5) Nucleus
(1)What is the state of the cell shown in the cell shown in the diagram?
(2)Name the structure which acts as a selectively permeable membrane.
(3)If the cell had been placed in distilled water instead of strong sugar solution, which feature would not have been seen?
(4)Name any one feature of this plant cell which is not present in an animal cell.
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.
Choose the correct answer:
Plasmolysis will occur when the cell is placed in a __________
Choose the correct answer:
Cell turgidity is caused by _______________
Mention whether the following statement is true (T) or false (F) and give explanation in support of your answer.
Plasmolysis is reverse of deplasmolysis.
Give Reasons for the following.
Salt and sugar are used in preserving food.
Give Reasons for the following.
Drops of water on a leaf of plant like peepal does not enter the leaf by osmosis?
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.
Explain the Term:
Osmosis
Explain the Term: Exosmosis
DPD of a cell can be expressed as ______
The given statement is incorrect. Rewrite the correct statement:
Fresh water fish when placed in hypertonic salt solution absorb water and burst.
