The difference in the growth of algae
in the presence or absence of sunlight
Koshi High School
Kumi
Ikeda
Nao Ito
Nodoka
Uchida
Why we chose this
theme.
More and more riverbeds in
Japan are being covered with
concrete.
We thought this is bad for the environment.
Are there differences in the
growth of algae depending on the
presence or absence of sunlight ?
The contents of our
experiment.
We put dechlorinated water and
the same amount of algae in two water
tanks.
Our
hypothesis
The algae with sunlight would
grow
better than that without sunlight.
Resul
t
The day we
started our
experiment.
Sunlig
ht
shade
Resul
t
One week
later…
Sunlig
ht
shade
Resul
t
Two weeks
later…
Sunlig
ht
shade
Resul
t
Three weeks
later…
Sunlig
ht
shade
Considerati
on
Sunlig
ht
Considerati
on
shade
Considerati
on
Sunlig
ht
Considerati
on
shade
The types of the two water tanks
were not the same.
This may have affected the result to some
extent.
Further
research
We are going to see if there are some
differences in the photosynthetic
pigment in algae from the river.
Procedu
re
①Grind the material with a mortar and
pestle and add acetone to extract
pigments.
Procedu
re
②Separate the pigments
using paper chromatography.
Paper
chromatography
Paper
chromatography
Water
Paper
chromatography
Procedu
re
③Try to find the Rh value
based on the formula.
Rh value=
Movement distance of the pigment⟨㎝⟩
Movement distance of the liquid which unfolded⟨㎝⟩
A
bibliography
○光合成色素の分離
http://www.makasaka.net/seibutu/chromato/chromato.
html
Thank you for
listening.