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TRANSPIRATION

What Factors, including environmental variables, affect the rate of transpiration in plants?
by eve emswiler on 18 January 2013

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Transcript of TRANSPIRATION

Background: Cells and organisms must exchange matter with the environment to grow, reproduce, and maintain organization
the availability of resources influences responses and activities
Plants absorb and transport water, nutrients, and ions from the surrounding soil via osmosis, diffsion, and active transport
Absorbed water and nutrients flow upward from roots to shoots through the xylem and are apart of the process of transpiration
there is a subsequent water loss at the surface of the leaves due to evaporation. Some Questions to Ponder... Do all Plants have Stomata? Is there any relationship between the number of stomata and the environment in which the plant evolved?
Are leaf surface area and the number of stomata related to the rate of transpiration? What might happen to the rate of transpiration in the number of leaves or the size of the leaves was reduced?
Do all plants transpire?
Do all plants transpire at the same rate? Is there a relationship between the habitat in which plants evolved and the rate of transpiration?
what other factors, including environmental variable, might contribute to the rate of transpiration?
what structural features and or physiological processes help plants regulate the amount of water lost through transpiration?
How do plants maintain the balance between the transport of CO2 and 02 and the amount of water lost through transpiration?
RESULT! Process the transport of water upwards is governed by differences in water (or osmotic) potential
water moves from an area of high water potential (higher free energy, more water) to an area of lower water (lower free energy, less water)
the movement of water up through a plant is facilitated by osmosis, root pressure, and the physical and chemical properties o water
Transpiration creates a lower osmotic potential in a leaf
the TACT (Transpiration, Adhesion, Cohesion, and Tension) mechanism describes the forces that move water and dissolved nutrients up the xylem
During transpiration, water evaporating from the spaces within leaves escapes through small pores called stomata
this is a major route of water loss in plants
the stomata must open no matter what to allow the inward flow of CO2 to be used in photosynthesis
O2 also exits through the stomata as a by product of photosynthesis
A balance must be maintained between these three elements
this is acheived through specialized cells that guard the opening and closing of stomata Transpiration Using a razor blade cut the plant stem so that its diameter will fit into the tube
drop dye into the water and stir.
insert plant into the dyed water
~~~~wait~~~~~
plant will now be dyed!
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