Q. 25.0( 1 Vote )

(a) Mention whether the following statements are true (T) or false (F).

(i) A plant cell placed in hypotonic solution gets plasmolysed. (T/F)

(ii) Addition of salt to pickles prevents growth of bacteria because they turn turgid. (T/F)

(iii) Cells that have lost their water content are said to be deplasmolysed. (T/F)

(iv) Xylem is the water conducting tissue in plants. (T/F)

(v) The shrinkage of protoplasm, when a cell is kept in hypotonic solution. (T/F)

(vi)The cell wall of the root cell is a differentially permeable membrane. (T/F)

(b) Correct the false statements by altering the last word only.

Answer :

(i) A plant cell placed in hypotonic solution gets plasmolysed.

(a) False


(b) A plant cell placed in hypotonic solution gets turgid.


Explanation: A plant cell placed in hypertonic solution gets plasmolysed due to exosmosis and when placed in hypotonic solution gets turgid due to endosmosis.


(ii) Addition of salt to pickles prevents growth of bacteria because they turn turgid.


(a) False


(b) Addition of salt to pickles prevents growth of bacteria because they turn flaccid.


Explanation: Addition of salt to pickles increases the concentration and when bacterias come in contact it undergoes exosmosis and thus becomes flaccid or plasmolysed leading to its death.


(iii) Cells that have lost their water content are said to be deplasmolysed.


(a) False


(b) Cells that have lost their water content are said to be plasmolysed.


Explanation: Cells that have regained their water content after being plasmolysed are said to be deplasmolysed.


(iv) Xylem is the water-conducting tissue in plants.


(a) True


Explanation: The vascular bundle is the system of plants regarding the conduction of food, water, and minerals. It consists of two parts xylem, which is the water-conducting tissue, and the phloem, which is concerned with the conduction of food (glucose).


(v) The shrinkage of protoplasm, when a cell is kept in hypotonic solution.


(a) False


(b) The shrinkage of protoplasm, when a cell is kept in hypertonic solution.


Explanation: The protoplasm of a cell shrinks due to exosmosis of water which occurs in hypertonic solution whereas; a cell is kept in hypotonic solution swells up due to endosmosis of water.


(vi) The cell wall of the root cell is a differentially permeable membrane.


(a) True


Explanation: A differentially permeable membrane allows small particles to pass through but blocks the larger ones. The cell wall of the root cell is a differentially permeable membrane because it gives passage to certain salts and solutes but blocks the passage of soil particles surrounding it in case of root cells.


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