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Lesson 13
Movement of Water
Learning Outcomes
• Must: Know how root hair cells are adapted,
and what transpiration is.
• Should: Explain the key factors that affect the
rate of transpiration.
• Could: Analyse experimental data.
Which organelles are found in a plant
cell?
Root Hair Cell
• Increases the surface area for the absorption
of water and minerals.
What is transpiration?
Transpiration is the loss of water by evaporation from
plants.
Plants lose water when they open the stomata in the
leaves to let in carbon dioxide.
The speed at which a plant loses water is called the
rate of transpiration. This varies depending on the
plant’s environment.
The different environmental factors that can affect
the rate of transpiration include
• Temperature
• Humidity
• Air Flow
• Light intensity
Stomata
Stomata are pores found on the underside of leaves.
Their opening and closing is controlled by guard cells.
Transpiration True or False?
• Plants lose water when the stomata are closed
• The higher the temperature, the higher the
rate of transpiration.
• Increasing humidity will increase the rate of
transpiration.
• Transpiration is the loss of water from a plant.
• There are more stomata on the top of the leaf.
Homework
Revise for an end of topic test