What is Transpiration

1
What is Transpiration?

• Transpiration is the process by which the plant
  cools itself by releasing water from openings in
  its leaves called stomata.

2
Stomata

• Stomata are openings on the bottom side of
  plants leaves which release water to cool the
  leaves when needed.
• They are opened and closed by guard cells.

3
When Do the Stomata Open?

• The stomata open only when the air temperature is
  hot, during the daylight hours.
• They do not open if the plant is water stressed.