Biology IA
Research Question: How does varying distance of light away from papaya leaf discs at 10cm, 15cm, 20cm, and 25cm affect time taken in seconds for all five discs to rise and float on the surface of the water?
Hypothesis: “As the distance of light away from papaya leaf discs increases, the average time taken for the discs to resurface and float o the surface of the water increases.”
Data Collection & Processing
Raw Data Table: Time taken (minutes) for the five discs to resurface and float on the surface of the water.
Processed Data Table: Average time taken (seconds) for the five discs to resurface and float on the surface of the water.
Processed Data Table: Average time taken (seconds) for the disc to resurface and float on the surface of the water.
Observations: Firstly, there were small oxygen bubbles observed on the surface of the discs that accumulated over time. When the discs finally had enough oxygen bubbles built, the discs started floating up to the surface of the water. Secondly, it was also noticed that the closer the discs were to the lamp, the faster it took for the five discs to surface.
Required Calculations Needed For This Investigation
*Using the data of distance at 10cm away from the lamp as an example to show how to determine: convert minutes to seconds, the average time taken (seconds) for the disc to resurface and float on the surface of the water and the standard deviation.
Converting minutes to seconds:
The average time taken (seconds) for the disc to resurface and float on the surface of the water:
Standard Deviation: (Graphic Calculator)
1. Press STAT
2. Press 1: Edit
3. Put in the data for time taken in seconds at distance of 10cm away from lamp into L1
4. Press STAT
5. Press > to go into CALC
6. Press 1: 1-Var Stats and ENTER
7. Sx: 37.89
Standard Deviation = 37.89
Graph
Graph: Relationship between
Hypothesis: “As the distance of light away from papaya leaf discs increases, the average time taken for the discs to resurface and float o the surface of the water increases.”
Data Collection & Processing
Raw Data Table: Time taken (minutes) for the five discs to resurface and float on the surface of the water.
Processed Data Table: Average time taken (seconds) for the five discs to resurface and float on the surface of the water.
Processed Data Table: Average time taken (seconds) for the disc to resurface and float on the surface of the water.
Observations: Firstly, there were small oxygen bubbles observed on the surface of the discs that accumulated over time. When the discs finally had enough oxygen bubbles built, the discs started floating up to the surface of the water. Secondly, it was also noticed that the closer the discs were to the lamp, the faster it took for the five discs to surface.
Required Calculations Needed For This Investigation
*Using the data of distance at 10cm away from the lamp as an example to show how to determine: convert minutes to seconds, the average time taken (seconds) for the disc to resurface and float on the surface of the water and the standard deviation.
Converting minutes to seconds:
The average time taken (seconds) for the disc to resurface and float on the surface of the water:
Standard Deviation: (Graphic Calculator)
1. Press STAT
2. Press 1: Edit
3. Put in the data for time taken in seconds at distance of 10cm away from lamp into L1
4. Press STAT
5. Press > to go into CALC
6. Press 1: 1-Var Stats and ENTER
7. Sx: 37.89
Standard Deviation = 37.89
Graph
Graph: Relationship between
Bibliography: Johnson, J. J. (n.d.). Lab Report . Retrieved 3 1, 2014, from IB Biology Higher Level: http://www.edu.pe.ca/gray/class_pages/smaccormack/leaf_disc_photosynthesis_write_up.pdf Photosynthesis. (n.d.). Retrieved 3 1, 2014, from IB Guide: http://ibguides.com/biology/notes/photosynthesis-hl