Absorption by Root Class 10 Concise Short Ans Type ICSE Biology Selina Solutions Ch-4. In this article you will get the solutions of Short Answer Type Questions as council latest syllabus. Visit official website CISCE for detail information about ICSE Board Class-10 Biology.
Absorption by Root Class 10 Concise Short Ans Type ICSE Biology Selina Solutions Ch-4
| Board | ICSE |
| Subject | Biology |
| Class | 10 |
| Book | Selina Concise |
| Chapter-4 | Absorption by Root– The Process Involved |
| Topics | Short Answer Type Questions |
| Session | 2024-25 |
Short Answer Type Questions
(Class 10 Concise ICSE Biology Selina Solutions Ch-4 Absorption by Root– The Process Involved)
Que-1: Differentiate between the following :
(a) Plasmolysis and Deplasmolysis
(b) Turgor Pressure and Wall Pressure
(c) Hypotonic and Hypertonic solution
(d) Turgidity and Flaccidity
Sol:
(a) Difference between Plasmolysis and Deplasmolysis
| Plasmolysis | Deplasmolysis |
|---|---|
| It refers to the shrinkage of the cytoplasm and withdrawal of the plasma membrane from the cell wall caused due to the withdrawal of water when placed in a hypertonic solution. | Deplasmolysis is the recovery of a plasmolysed cell when it is placed in water, wherein the cell’s protoplasm again swells up due to the re-entry of water. |
| In Plasmolysis, the cell becomes flaccid. | In Deplasmolysis, the cell becomes turgid. |
(b) Difference between Turgor pressure and Wall pressure
| Turgor Pressure | Wall Pressure |
|---|---|
| Turgor pressure is the pressure of the cell contents on the cell wall. | Wall pressure is the pressure exerted by the cell wall on the cell content. |
| helps keeps plant stems erect, keeps leaves expanded, involve in opening and closing of stomata, etc. | helps maintain the structure of cells and the plant. |
| acts towards the outside from the cell. | acts towards the inside of the cell. |
(c) Difference between Hypotonic and Hypertonic solution
| Hypotonic Solution | Hypertonic Solution |
|---|---|
| The solution outside the cell has a lower solute concentration than the fluids inside the cell. | The solution outside the cell has higher solute concentration than the fluids inside the cell. |
| Endosmosis occurs as the water molecules move into the cell. | Exosmosis occurs as the water molecules move out from the cell. |
| When placed in Hypotonic Solution, the cell slightly enlarges or even bursts. | When placed in Hypertonic Solution, the cell shrinks in size and loses shape. |
(d) Difference between Turgidity and Flaccidity
| Turgidity | Flaccidity |
|---|---|
| the state of a cell in which the cell wall is rigid and stretched by an increase in the volume of vacuoles due to the absorption of water. | condition in which the cell content is shrunken and the cell is not tight. |
| occurs when the cell is placed in Hypotonic solution. | occurs when the cell is placed in Hypertonic solution. |
| caused by Endosmosis. | Caused by Exosmosis. |
| Water moves into the cell. | Water moves out of the cell. |
Que-2: Mention whether the following statements are true (T) or false (F). Correct the false statements by altering the last word only.
(a) Addition of salt to pickles prevents the growth of bacteria because they turn turgid.
(b) Cells that have lost their water content are said to be deplasmolysed.
(c) Xylem is the water conducting tissue in plants.
(d) The protoplasm shrinks, when a cell is kept in hypotonic solution.
(e) The cell wall of the root cell is a differentially permeable membrane.
Sol:
(a) False
Corrected statement — Addition of salt to pickles prevents the growth of bacteria because they turn flaccid.
(b) False
Corrected statement — Cells that have lost their water content are said to be plasmolysed.
(c) True
(d) False
Corrected statement — The protoplasm shrinks, when a cell is kept in hypertonic solution.
(e) False
Corrected statement — The cell wall of the root cell is a permeable membrane
Que-3: Mention whether the following statements are true (T) or false (F) and give explanation in support of your answer
(a) Guttation is another name for bleeding in plants.
(b) Soaked seeds burst their seed coats.
(c) If the phloem of a twig is removed keeping the xylem intact, the leaves of a twig wilt.
(d) Guttation in plants occurs maximum at mid-day.
(e) Raisins when submerged in water swell up due to endosmosis.
Sol:
(a) False
Explanation: Guttation is the process by which drops of water appear along leaf margins due to excessive root pressure whereas bleeding is the loss of cell sap through a ruptured stem.
(b) True
Explanation: The seeds and grains swell up when soaked in water due to imbibition and endosmosis. The force generated by water thus absorbed is strong enough to make the seeds coats burst.
(c) False
Explanation: The leaves of the twig remain turgid since its xylem is intact and xylem is responsible for water conduction in plants.
(d) False
Explanation: Guttation is the exudation of drops of xylem sap on the tips of leaves and occurs due to excessive root pressure. It is maximum when root pressure is maximum which occurs in the early mornings or at night. This is because during these times, transpiration is very low and water absorption is very high.
(e) True
Explanation: When raisins are submerged in water, concentration of solute inside the raisins is more than the concentration of water. Water acts as a hypotonic solution for raisins due to which endosmosis occurs. As raisins absorb water due to endosmosis, they swell up.
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