Transpiration
Chapter Name : Transport In Plants |
Sub Topic Code : 103_11_11_04_01 |
Topic Name : Transpiration |
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Sub Topic Name : Transpiration |
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Introduction
The loss of water by plants through stomata present on the leaves is transpiration. It also helps in transport of water in higher plants.
Pre-Requisites:
Root pressure in plants.
Activity:
Enclose a healthy plant in a polythene bag for some time. Observe the droplets of water formed inside the bag due to transpiration.
Real Life Question:
Transpiration leads to loss of water in plants but how do plants in desert regions conserve water?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Transpiration | Process of loss of water in plants. Occurs through stomata present on leaves. |
| Guard cells | When guard cells become turgid, stomata opens. When guard cells become flaccid, stomata closes. |
| Properties of water | Cohesion, adhesion and surface tension helps the water movement through the xylem up to the leaf through the capillary action. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Cobalt Chloride | Take a cobalt chloride paper and keep it on the plant leaf attached for some time. See the colour change in the paper which occurs after absorbing water from the leaf |
Real life uses :
Transpiration helps water to move in plants through xylem vessels at a distance of over 130 meters and more.
Places to visit :
Biology Laboratory, garden, etc
Practical examples around us
| Examples | Explainations |
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What you learn in Theory:
What is transpiration and how it helps water to reach leaves of the plant.
What you learn in Practice:
Water reaches in the leaves in the plants through transpiration for photosynthesis to take place.