Photosynthesis

So, photosynthesis creates sugar for plants to use for energy, it also produces oxygen. So, in this lab we experimented with 5 variables to test to see what sort of light produces the most oxygen. These are our results.

Variable Change %change
No light 1.2 to 1.2 0%
White 1.1 to 2.1 91%
Blue 1.4 to 3.7 164%
Red 1.6 to 3.0 88%
Green 1.0 to 1.0 0%

So, there are 2 light sources that did not promote any light: no light and green light.

Oxygen was produced in the experiment, which was our main goal. Success!

1. No light and green light had 0% change
2. Blue light made the most oxygen - similar to the depths of water.
3. White light had less photosynthesis occurring than blue light

• With no light - photosynthesis requires light to occur
• Green light - plant was green so its light is reflected by the green in the chloroplasts so the algae could not use the light to split the oxygen molecules
• Our error was considered to be our lack of massing the algae samples.