problem: how does intensity and wavelength of light affect photosynthesis?
hypothesis: the leaves covered in black have a much slower photosynthesis compared to the regular green leaves because they are blocked off from the light. I think the leaves covered with red will stimulate a faster photosynthesis process compared to the natural leaves. The green cellophane on the leaves will do nothing, given it is the same color as the leaves. I predict the blue will slow down photosynthesis because I believe that blue will make the molecules move slower.
materials: scissors, black construction paper, potted plant, tape, blue/red/green cellophane, 5 large test tubes, glass-marking pencil, forceps, 400-ml beaker, 5 petri dishes, iodine solution, paper towels
procedure:
1. cut black paper and colored cellophane
2. cover three leaves in black paper and cellophane; keep three leaves untreated
3. leave plant in sunlight for 2 days
4. cut off each experimental leaf and one leaf that was not treated
5. roll up each leaf and put it in a large test tube; label
6. remove the chlorophyll by boiling the leaves in alcohol
7. rinse in water
8. put leaves in petri dish; label
9. dowse in iodine
10. wait one minute and then place leaves on paper towel to dry
11. observe and record
results: as hypothesized the red cellophane sped up photosynthesis. The green stayed the same, the blue slowed photosynthesis as well as the black paper.
reflection: Overall this lab was very interesting and I felt very accomplished that all my hypotheses proved accurate. One thing our group could have done better is worked more efficiently. There were also many moments when I was confused about what was happening and what to do next. Yet we still finished everything on time.
1. cut black paper and colored cellophane
2. cover three leaves in black paper and cellophane; keep three leaves untreated
3. leave plant in sunlight for 2 days
4. cut off each experimental leaf and one leaf that was not treated
5. roll up each leaf and put it in a large test tube; label
6. remove the chlorophyll by boiling the leaves in alcohol
7. rinse in water
8. put leaves in petri dish; label
9. dowse in iodine
10. wait one minute and then place leaves on paper towel to dry
11. observe and record
results: as hypothesized the red cellophane sped up photosynthesis. The green stayed the same, the blue slowed photosynthesis as well as the black paper.
reflection: Overall this lab was very interesting and I felt very accomplished that all my hypotheses proved accurate. One thing our group could have done better is worked more efficiently. There were also many moments when I was confused about what was happening and what to do next. Yet we still finished everything on time.