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Transport in Plants
Chapter 14
Transport in a plant
• Plants have a transport system.
• Xylem vessels carry water (and minerals )
from the roots to the leaves of the plant.
• Phloem tubes carry food (made in the
leaves) all around the plant.
To show the absorbtion of water by
roots
Transpiration
• What is Transpiration?
• Transpiration is the loss
of water from the leaves
of a plant.
• Water is lost through the
stomata. These are tiny
pores on the undersurface
of the leaf.
The Transpiration stream
The flow of water
from the roots to
the leaves is called
the transpiration
stream.
Functions of Transpiration
The functions of transpiration are:
1.To carry water to the leaves for
photosynthesis
2.To carry minerals from the roots to the
leaves
3.To cool the plant.
Factors affecting transpiration
Transpiration is highest in:
Bright sunlight
a gentle breeze
low humidity
and good availability of soil water
To show the absorption of water by roots
• Set up apparatus as shown.
• Test tube A is a control.
• Record the level of water in
each test tube after a week.
Oil
• Result
Water
To Demonstrate Transpiration
Apparatus:
Potted plant, plastic bag,
Elastic band, Blue Cobalt chloride paper
Method:
1. Set up apparatus as shown in diagram
2. Leave in a warm place for 3-4 hours.
3. Test the droplets of colourless liquid with
blue cobalt chloride paper.
Result
The blue cobalt chloride paper will turn pink.
This shows that water vapour is released
from a plant during respiration.