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TRANSPIRATION- A Plant Physiology Presentation
Transcript of TRANSPIRATION- A Plant Physiology Presentation
2013 Hanna, Chanika
Guerrier, Makeda It occurs at the leaves while their stomata are opened. Definition Transpiration is the evaporation of water from plants. THE END Questions Research Questions What is Transpiration?
How does temperature effect Transpiration in plants? PLANT
TRANSPIRATION Where does it occur? Transportation due to cold temperatures Do you Understand? A bit? Transpiration Pull
Theory Sunshine - warms the leaf, initiates photosynthesis
Tension - causes tension (negative pressure) in leaf water. Water is pulled up the xylem.
Adhesion - water sticks to the xylem wall, resists gravity
Cohesion - water column remains intact because water molecule is bound to the next molecule by hydrogen bonds.
Transpiration - evaporation of water from plants through stomata THE EMD Transpiration Due to Hot
Temperatures Guerrier, Makeda
Hanna, Chanika The Kaleido-Fierce
Group LET'S MAKE SURE BY WATCHING A QUICK REVIEW - Temperature affects the rate at
which transpiration occurs.
- During cold weather, the stoma remain
closed, and do not release as much water.
- Plants often go dormant during winter,
due to the colder temperatures, and prolonged
closing of the stoma. Temperature greatly influences
the magnitude of the driving
force of water movement out of a plant
rather than having a direct effect on
stomata. As temperature increases, the water holding
capacity of that air increases sharply.
The amount of water does not change, just the
ability of that air to hold water.
Because warmer air can hold more water, its relative humidity is less than the same air sample at a lower temperature, or it is ‘drier air’. Because cooler air
holds less water, its relative humidity increases or it
is ‘moister air’.
Therefore, warmer air will increase the driving
force for transpiration and cooler air will
decrease the driving force for transpiration.