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Progress Check
1. Name the following:
(i) The state of a cell when it cannot
accommodate any more water.
(ii) Pressure of the cell contents on the cell wall.
(iii) The condition that is opposite to turgid.
(iv) The state of a plasmolysed cell after the
re-entry of water.
(v) The pressure under which water passes
from the living cells of a root into xylem.
DOOTUMDS AND THE
Answers
Answer:
(i) Turgidity
Explanation: Turgidity is the state of a cell in which the cell wall is rigid and inflated because of the increase in size of vacuoles due to absorption of water.
(ii) Turgor pressure.
Explanation: it is the term given to the pressure exerted by the cell contain on the cell wall which is opposite to the pressure exerted by the cell wall.
Note: Both these pressures are important to maintain a definite structure of the cell or else the cell will be distorted.
(iii) Cell wall.
Explanation: As a leather casing protects the football inside it, similarly, the cell wall protects the cell from harm inside it.
(iv) Flaccid.
Explanation: It is the term given to the condition of the cell where the cell is no longer turgid and all its contents has shrunken due to excessive water loss.
(v) Deplasmolysed.
Explanation: It is the term given to the state of cell which regains its turgidity after it has been plasmolysed.
(vi) Root pressure.
Explanation: It is the pressure developed by the root due to the inflow of water which helps pushing the plant sap upwards.
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