photosynthesis
TRANSCRIPT
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Arnel, Kimberlyanne, Wendy
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Motivation
Find how the different spectrums
of light affect the rate of
photosynthesis in plants. If a plant is placed under a green colored light, less
photosynthesis occurs compared to other colors on
light spectrum.
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What is photosynthesis?
Photosynthesis is the process of
converting solar energy into
chemical energy.
Chloroplast a & b
e- transport chain
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Materials 3 Beakers
3 Petri Dishes
Green, Blue, and Red Food Coloring
5 Cuvettes
Water
Chloroplast Solution
DPIP
6.5 pH Phosphate Buffer
Spectrophotometer
Light Source
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Methodology3 cuvettes containing solution were placed
in separate beakers
Covered with petri dish lids filled with
red, blue, and green food coloring
1 cuvette was placed and covered under a
large bin.
1 cuvette was placed under the normal
lighting
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… Every five minutes for twenty minutes, the cuvettes
were taken from the beakers and placed into the
spectrophotometer to measure the transmittance of
light.
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Setup
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Percent Transmittance vs. Time
Minutes Control
(%)
Blue (%) Red (%) Green (%) Dark (%)
0 21.8 35 55.8 50.6 17.2
5 20 65 50.2 53.2 16
10 20.2 71.6 70.4 53.6 16.4
15 19.8 70.6 62.4 53.2 16
20 19.6 70.8 69.8 53.8 16.2
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Graph
0
10
20
30
40
50
60
70
80
5 5 10 15 20
Ligh
t Tr
ansm
itta
nce
(%
)
Time (minutes)
Rate of Photosynthesis
Blue
Red
Green
Dark
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Blue & red lightChloroplasts contain pigments named
chlorophyll a and chlorophyll b which
absorb photons from the sunlight.
The pigments absorb blue and red
light best.
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Green light
Green light is reflected
By reflecting the green, little to
no sunlight is absorbed.
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Dark
Decreased due to no light being
absorbed.
Light is needed to create ATP and
power photosynthesis.
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Photosynthesis