Jeffrey Chen
Summer AP Biology Project
Angle of Light Engagement
Question: Do plants exhibit photropism?
Hypothesis: If I tilt the plant at 0 degrees, then the plant will grow at 90 degree angle in relation to the soil, because phototropism results in the plant growing towards the light source. If I tilt the plant at 15 degrees, then the plant will grow at 75 degree angle in relation to the soil, because phototropism results in the plant growing towards the light source. If I tilt the plant at 50 degrees, then the plant will grow at 40 degree angle in relation to the soil, because phototropism results in the plant growing towards the light source.
Materials Needed: 3 Gardening pots, garden soil, Aluminum foil, labeling marker, duct tape/Velcro, …show more content…
Even with different angle of pots, different angle of sunlight, the plants showed to grow towards the light source. Although the angle of growth’s pattern proved to be consistent, the rates of growth differ tremendously. The 25 degree pot grew slower than the pot at 0 degree. This is a human error that I could not adjust due to the fact that the other part of the experiment needed to have the pot angled at a way not enough sunlight engaged. One modification that I could have added was a light lamp for the pots with less light.
Conclusion- Overall, this experiment proved the hypothesis to be correct. The data showed with different angled plants, the angle of growth added with the initial pot’s angle equals out to 180 degree. I really enjoyed this lab because this lab tested my abilities to record data, care for a living organism, and lastly, prepare for labs in the upcoming class. To sum it all up, the hypothesis that plants will grow directly towards its light source proved to be correct.

POST LAB QUESTIONS
1) How do living organisms reproduce, grow, and develop?
Organisms reproduce when the egg of an organism is fertilized by the male sperm. They grow and develop when cells divide during meiosis or