Transpiration: Ready, Set, Transpire!!
Stacy Cunningham, Christy Crammer, and Aline Rodriguez
Allentown School District
NaCl Ready for Race Day
Icy Cold: Will it slow down?
Hypothesis :
Salt water will not travel as far through the stalk of celery as the control.
Hypothesis:
Ice water will move more slowly through the stalk of celery than Distilled water.
Design of Experiment:
Controlled Variables:
*amount of water (15 mL)
*amount of dye
*amount of light
*length of celery (24 cm.)
Design of Experiment:
Controlled Variables:
*amount of water (15 mL)
*amount of dye
*amount of light
*length of celery (24 cm.)
Independent Variable:
*Solution Composition (NaCl)
Dependent Variable:
*Distance dye moves through celery
Dependent Variable:
*Distance dye moves through celery
Question:
When I change the temperature of the water, will the length of transpiration vary?
Question:
When I change the composition of the water solution, will the length of transpiration vary?
NaCl water
(Independent Variable)
Independent Variable:
*Water Temperature (O°C)
Ice water
(Independent Variable)
Distilled water
(Control)
Distilled water
(Control)
Set up of Experiment:
Independent Variable: Put 4 Tbsp of NaCl in 150 mL of water with red dye
Control: 150 mL of water with red dye with celery
Place on window sill
Set up of Experiment:
Independent Variable: Put ice in 150 mL of water with red dye until water reaches 0°C
Control: 150 mL of water with red dye with celery
Place on window sill
Results:
The rate of transpiration in the NaCl celery was considerably less than in the control
water. The water moved on 2.2 cm up the length of the celery in the salt water, whereas
it moved up the celery in water to the top, 24 cm.
Results:
The rate of transpiration in the Ice Water celery was equal to the rate of transpiration in the
control water. The water moved 24 cm up the length of both pieces of celery.
However, what was not measured but noted the speed at which the dye moved up the celery was
considerably slower in the ice water than in the control room temperature water.
NaCl water
(Independent
Variable)
Ice water
(Independent
Variable)
Distance Dye Travelled
25
Distance Dye Travelled
25
Distilled water
(Control)
20
Transpiration in Centimeters
Transpiration in Centimeters
20
15
10
Distilled water
(Control)
5
10
5
0
NaCl
15
0
Water
Ice
Water
Conclusions:
And the winner is:
Transpiration will occur faster using room temperature water. With ice water
running a close second in the race of transpiration. Pulling up the end of the
race with a weak finish, is NaCl water!!
NaCl
Ice
Control
Ice Water
Room Temperature
water
NaCl Water