1. Koshi High School Kumi Ikeda Nao Ito Nodoka Uchida Hayato Ohata
The difference in the growth of algae in the presence or absence of sunlight
Koshi High School
　　　　　 Kumi Ikeda
　　　　　 Nao Ito
　　　　　 Nodoka Uchida
　　　　　 Hayato Ohata

2. 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 ?

3. The contents of our experiment.
We put dechlorinated water and
the same amount of algae in two water tanks.

4. Our hypothesis The algae with sunlight would grow
better than that without sunlight.

5. Result
shade
The day we started our experiment.
Sunlight

6. Result
shade
One week later…
Sunlight

7. Result
shade
Two weeks later…
Sunlight

8. Result
shade
Three weeks later…
Sunlight

9. Consideration
Sunlight

10. Consideration
shade

11. Consideration
Sunlight

12. Consideration
shade

13. The types of the two water tanks
were not the same.
This may have affected the result to some extent.

14. Further research
We are going to see if there are some differences in the photosynthetic pigment in algae from the river.

15. Procedure ①Grind the material with a mortar and
　　pestle and add acetone to extract pigments.

16. Procedure
②Separate the pigments
using paper chromatography.

17. Paper chromatography

18. Paper chromatography
Water

19. Paper chromatography

20. Procedure ③Try to find the Rh value based on the formula. Rh value=
Movement distance of the pigment⟨㎝⟩ Movement distance of the liquid which unfolded⟨㎝⟩

21. A bibliography
○光合成色素の分離　

22. Thank you for listening.