Plant -Water Relations
Chapter Name : Transport In Plants |
Sub Topic Code : 103_11_11_02_01 |
Topic Name : Plant -Water Relations |
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Sub Topic Name : Water Potential |
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Introduction
Movement of water takes place in plants through water potential which comprises of solute potential and pressure potential.
Pre-Requisites:
• Structure of plant cell. • Importance of water for survival of plant.
Activity:
Don’t water a plant at all and see how it withers away. See the importance of water for survival.
Real Life Question:
Water moves in plants through pressure build up. Imagine the places where pressure is build up in human body for movement of blood and nutrients?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Water potential | Movement of water from system containing water at higher water potential to the one having lower water potential. It is denoted by ?w. And ?w = ?s + ?p. |
| Solute potential | Lowering of water potential due to dissolution of solute is termed as solute potential. Denoted by ?s. |
| Pressure potential | Building up of pressure in plants which lead to the movement of water into the cells making the cell turgid. Pressure potential s denoted by ?p. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Observe a turgid cell and flaccid cell under microscope. | Try to see the water molecules in turgid cell and note the difference between both the cells. |
Real life uses :
Plants cannot survive without water.
Places to visit :
Biology Laboratory, garden, etc.
Practical examples around us
| Examples | Explainations |
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What you learn in Theory:
Movement of water molecules through water potential, solute potential and pressure potential.
What you learn in Practice:
How water is transported to each and every part of the plant.