Author: Watts, Grace

By: Sarah Alevizatos, Henna Fraiman, Alex Rubin, Grace Watts

How did the total daylight effect the leaf fall rate and color change of the leafs?
Methods:
Leaf fall- Picked a branch on three different trees. Counted the starting amount of leaves on the branch.
-Counted how many leaves were on the branch each class
-Then wrote the data down in notebook and inputted then into scratch and fathom
Color change- Recorded the number of leaves that started to change colors each class for branch one only
-Got the percentage of how many leaves were changing colors
Then wrote the data down in notebook and inputted then into scratch and fathom

Model Analysis:
-The program scratch was used to create a model for the leaf fall rate and leaf color change
-This program is an easy place for our data to be used to create a slider that showed how the leaf fall rate and color change was effected by the daylight
-The predictions that the program made were not exact to the actual data but were close
-The equation was used from fathom to create the program
Data Analysis:
-As the daylight decreases the leaf fall and color change increases. The leaf fall rate did not make sense because the graph had a negative slope
-One scratch and fathom was reliable for color change but it was not for leaf fall rate.
-We created two graphs with a negative slope so they made sense to the data.
-Fathom was used to collect data

Conclusion:
-Throughout the season, as the days get colder and the days get shorter the total daylight decrease. From the total daylight decreasing, the leaf fall rate decreased and the color change rate increased for all three trees.
-The observations made somewhat made sense. The graphs show that the leaf fall rate decreased as daylight deceased. Color change increased as daylight decrease. It does not make sense that the leaf fall rate decreased because it would normally increase.
-Yes the data can be used to predict what happens in future seasons because the same things tend to happen each year.
-The data can be reproducible if the location or weather/temperature is the same.
Future Work:
-Group 1(Alex, Henna, Sarah, and Grace) collected data by choosing one branch on three different trees. Then the amount of leaves that were left on each of the branches each time was recorded. Group 2(Olivia, Catherine, Keziah) chose three different branches from one tree. The starting number of leaves was counted. Then the number of leaves left on the tree were counted. Lastly, the number of leaves found that day was subtracted from the number of leave that were last counted
-Group 1 could make the experiment more reliable by doing the experiment throughout more than one season.