The results are the if the light is farther

The effect of light distance on the rate of photosynthesis Lab Report
Amya Hollins
Biology
January 17, 2018

Introduction & Hypothesis:

We Will Write a Custom Essay Specifically
For You For Only $13.90/page!


order now

The purpose of this experiment was to observe the effect of light distance on the rate of photosynthesis. This experiment is important because it demonstrates how photosynthesis works. Some of the factors that limit photosynthesis are light intensity, carbon dioxide concentration and temperature, and it is important to understand these because without the correct amount of light, a plant can’t photosynthesize at a fast rate, even if there is a lot of carbon dioxide and water. Photosynthesis is a process that plants and other organisms use to make chemical energy out of light energy so they can release it to give them energy to perform activities. Three factors can control the rate of photosynthesis: carbon dioxide concentration, light intensity and temperature. In the experiment that was ran, the speed at which the disks floated relates to the rate of photosynthesis by modeling the rate of the disks floating compared to light distance. Some new information that was learned in this experiment was, in order to make the disks float, you had to make them sink first by forcing all the air out of the spinach disks. The expected results are the if the light is farther away from the disks then the rate of photosynthesis speeds up. If you were to place the light further away from the spinach leaves, then the rate of photosynthesis speeds up because too much light concentration messes with the balance of water, light and carbon dioxide.
Materials and Procedure: 

Materials-

Lamp ( Grey, about a foot tell, flexible.)
Light Bulb ( Watts, Yellow tint.)
Electrical Outlet ( Standard 3 prong outlet.)
Glass Beaker ( ounces, about 4 inches tall, about 2 inches wide.)
Plastic Syringe ( Mostly clear w/ some purple, ounces)
10 spinach disks ( the size of a hole punch)
VII. Hole punch ( generic silver hole puncher, metal)
VIII. Baking Soda ( Arm & Hammer )
Water

Procedure-

Cut out 10 spinach disks with a hole punch
Get as much air bubbles out of the spinach disks by placing them into a syringe and pulling out the air until they all sink to the bottom
Place the sunken disks into a 250 mL beaker filled with 50 mL baking soda water solution
Place a lamp 1 cm. away from the top of the beaker and turn the lamp on
Record how many disks float to the top of the water every minute, for 15 minutes
Do steps 1-5 two more times 
Steps 1-6, placing the lamp 2 cm. away from top of beaker
Steps 1-6, placing the lamp 3 cm. away from top of beaker
Record all data
Create a graph based on your data, including the ET^50

Sketch-  

Results:

Data Table:

Independent 
Variable

1 centimeter away

2 centimeters away

3 centimeters away

ET^50

2

1.8

1.6

The effect of light distance on the rate of photosynthesis.

Graph: 

X-Axis describes the distance between the light and the beaker. Y-Axis describes the ET^50.Analysis:

The purpose of this lab was to study the effect of light distance on the rate of photosynthesis. If you were to place the light further away from the spinach leaves, then the rate of photosynthesis speeds up because too much light concentration messes with the balance of water, light and carbon dioxide. My data fully supports my hypothesis. For example, the ET^50 for condition 3 where the light was farthest away was 1.6 compared to 1.8 and 2.0 for the conditions that had the light closest to the beaker. Also all of the disks were floating at 8 minutes, and all of the disks completely surfaced. Compared to the other two trials, where the would be floating 2/3 of the way up. Some errors that could come up in my data are the exact amount of disks floating at exactly one minute, because some time I would miss a one minute mark and have to take an educated guess. One experiment that could come from this previous one is The effect of temperature on the rate of photosynthesis.