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BACHELOR’S BUTTON: RATE OF
TRANSPIRATION
CENTAUREA CYANUS
more commonly known as “Bachelor’s button”
or “Cornflower”
annual flowering plant belonging to the
Asteraceae family
this herb easily cultivated in a wide variety of
soils
The flowers are hermaphrodites, meaning they
have male and female organs, and are
pollinated with the help of other organisms such
as insects.
MATERIALS & METHODS
FRIST COLLECTION
Date
Age of Plant
Organ Length Weight Width
Leaf 5.7 cm 0.43g 1.2cm
Stem 0.6cm 0.010g 0.3cm
Root 4 cm 0.001g 0.3cm
Whole plant
Length Weight Dry weight
10cm 0.43g 0.05g
SECOND COLLECTION
Date
Age of Plant
Organ Length Weight Width
Leaf 6.3cm 0.50g 0.7cm
Stem 0.7 cm 0.020g 0.3cm
Root 4.2cm 0.06g 0.3cm
Whole plant
Length Weight Dry weight
11cm 0.62g 0.07g
CROSS SECTION
THIRD COLLECTION
Date
Age of Plant
Organ Length Weight Width
Leaf 9.5cm 0.86g 0.7cm
Stem 1.5cm 0.08g 0.5cm
Root 4.1 cm 0.21g 0.4cm
Whole plant
Length Weight Dry weight
14.3cm 1.37g 0.17g
CROSS SECTION
FOURTH COLLECTION
Date
Age of Plant
Organ Length Weight Width
Leaf 13cm 2.50g 0.9cm
Stem 6.4cm 0.40 g 0.5cm
Root 8cm 0.29g 0.6 cm
Whole plant
Length Weight Dry weight
27.2cm 3.28g 0.23g
CROSS SECTION
FIFTH COLLECTION
Date
Age of Plant
Organ Length Weight Width
Leaf 19cm 6.97g 1.5cm
Stem 5cm 0.61g 0.6cm
Root 14 cm 1.73g 1 cm
Whole plant
Length Weight Dry weight
37.8cm 9.93g 0.42g
CROSS SECTION
TRANSPIRATION
Plant transpiration is the release of water vapor to the atmosphere through the stomata.
Approximately 10% of all moist found in the atmosphere is released by transpiration
many external factors contribute to the rate of transpiration in organisms.
Humidity and air movement have a close relationship in terms of affecting the rate of transpiration in plants
MATERIALS AND METHODS
A potometer, or
transpirometer was utilized.
A fan was added as a the
variable
The stem was cut and
connected to the tube.
The pipette was filled with
water
Every three minutes,
pipette was measured
RESULTS
According to the observations made during
the experiment Plant B, containing the
variable (wind), as shown in figure 1, show a
wide range of transpiration while the control
shows not transpiration at all.
TABLE 1: AVERAGE VALUES OF ABSORBED WATER
Time (minutes) Control (without breeze) Experimental (with breeze)
0 0.8975 0.8460
3 0.8950 0.8445
6 0.8973 0.8440
9 0.8970 0.7985
12 0.8970 0.7875
15 0.8970 0.7968
18 0.8968 0.7960
21 0.8965 0.7948
24 0.8965 0.7935
27 0.8965 0.7925
30 0.8960 0.7440
AVERAGE VALUES OF ABSORBED WATER
0.7
0.75
0.8
0.85
0.9
0.95
0 3 6 9 12 15 18 21 24 27 30
Pip
et
measu
men
ts (
mL
)
Time (minutes)
Average values of absobed water
Control (without breeze) Experimental (with breeze)
Pipet measurements are inversely proportional to the amount of water
transpired.
DISCUSSION
Table 1 demonstrated that after six minutes
the experimental plant absorbed more
quantities of water that the control plant.
Wind carries away the humid air over the
plant’s surface, this increases the rate of
water evaporation, which increases the rate
of transpiration.
Increase air circulation increase the rate of
transpiration.
The hypothesis of this investigation was
proven to be true because the environmental
factor, wind, did in fact increase the rate of
transpiration of the Centaurea cyanus plant