Plant -Water Relations
Chapter Name : Transport In Plants |
Sub Topic Code : 103_11_11_02_03 |
Topic Name : Plant -Water Relations |
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Sub Topic Name : Plasmolysis |
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Introduction
The behaviour of plant cells with regard to movement of water depends on the concentration of surrounding solution.
Pre-Requisites:
Structure of plant cell.
Activity:
Observe this plant leaf under microscope. See their shrunk and water filled cytoplasm i.e. Flaccid and turgid cells.
Real Life Question:
What will happen to the human blood cell when kept in a hypertonic solution?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Isotonic solution | There is no movement of water from in or out of the cells. The cells and the surroundings are in equilibrium. The plant cells are in flaccid state. |
| Hypertonic solution | Water moves out of the cells causing them to shrink. This makes the plant cell plasmolysed. |
| Hypotonic solution | Water moves into the cell from the surrounding. This exerts turgor pressure against the cell wall and the cell becomes turgid. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Plant Leaf | Keep a plant leaf in various solutions such as sugar solution, salt solution etc. Try to see what happens to the leaf after sometime. |
Real life uses :
Plants wither away due to plasmolysis as their water component is lost.
Places to visit :
Biology Laboratory or botany laboratory.
Practical examples around us
| Examples | Explainations |
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What you learn in Theory:
The effect of various surroundings on plant cells and movement of water.
What you learn in Practice:
How water moves in and out of the cells with respect to concentration of the surrounding environments.