Q. 54.5( 2 Votes )

Mention whether the following statements are true (T) or false (F) and give an explanation in support of your answer.

(a) Plasmolysis is the reverse of deplasmolysis. (T/F)

(b) Guttation is another name for bleeding in plants. (T/F)

(c) Soaked seeds burst their seed coats. (T/F)

(d) If the phloem of a twig is removed keeping the xylem intact, the leaves of a twig wilt. (T/F)

(e) Guttation in plants occurs maximum at mid-day. (T/F)

(f) Dry seeds when submerged in water swell up due to endosmosis. (T/F)

Answer :

(a) Plasmolysis is reverse of deplasmolysis. True

Explanation: Plasmolysis is the condition of the cell where its contents is shrunken due to exosmosis when it was kept in a hypertonic solution. The revival of the cell from the plasmolysed state to the turgid state when the cell is again transferred to a hypotonic or isotonic solution is known as deplasmolysis.


(b) Guttation is another name for bleeding in plants. : False


Explanation: Guttation is the loss of water through special structures known as hydathodes present in the margin of leaves of certain plants whereas bleeding is the loss of sap from any cut surface on a plant tissue of any plants.


(c) Soaked seeds burst their seed coats. : True


Explanation: When the seeds are soaked in water after certain time their seed coat bursts out this is due to the excessive turgor pressure applied by its contents on the coat due to endosmosis of water. The seeds that are placed in water has a highly concentrated sap which results in the endosmosis of water from its surrounding thus leading to the bursting of its seed coat.


(d) If the phloem of a twig is removed keeping the xylem intact, the leaves of a twig wilt. : False


Explanation: Wilting of leaves is a result of the lower amount of water and loss of turgidity. The element of a vascular bundle that is concerned with the conduction of water is the xylem vessels. Thus, when the xylem of the twig is removed keeping the phloem intact, its leaves wilt.


(e) Guttation in plants occurs maximum at mid-day. : False


Explanation: Loss of water through special structures call hydathodes from the margin of the leaves is known as guttation and is generally observed early in the morning. Evaporation of water from the surface of the leaves occurs during the day and is known as transpiration.


(f) Dry seeds when submerged in water swell up due to endosmosis. : True


Explanation: The dry seeds that are placed in water have a highly concentrated sap which results in the endosmosis of water from its surrounding water which is a hypotonic solution. This results in the swelling of the seeds after some time, when placed in water.


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