How does Light Affect Photosynthesis?

In this lab, I asked the question of what light intensity on a scale of 0-50 will be most effective in producing oxygen. My hypothesis is that if plants need substantial sunlight, then 40 (80%) will be the most effective. My constants were the type of light (white), amount of carbon dioxide, temperature (10 degrees fahrenheit) and time (20 seconds). My dependent variable is the intensity of light. My independent variable is the amount of oxygen bubbles. My control is the intensity of 0.

	Light Intensity of 0 (0%)	Light Intensity of 10 (20%)	Light Intensity of 20 (40%)	Light Intensity of 30 (60%)	Light Intensity of 40 (80%)	Light Intensity of 50 (100%)
Amount of bubbles per 20 seconds	0	2	3	4	4	4

I found that my hypothesis was supported, however, the light intensity of 40 and 50 scored the same. They all produced 4 bubbles of oxygen in 20 seconds. Light is well-known as a necessary part in the process of photosynthesis, as stated in our vodcasts and textbooks. It’s expected that with no light, photosynthesis would not occur. To add on, with little light, it is also suspected that photosynthesis would be slow. This data supports our evidence that photosynthesis requires light. We can also infer that photosynthesis only needs a certain amount of light, and at a point, it doesn’t make it any faster.

This lab was done to demonstrate how to conduct an experiment. For me, I chose my specific experiment to see how vital light is in photosynthesis. From this lab, I can relate what I learned back to my knowledge of photosynthesis, our textbook notes, vodcast, and do now. This is applicable with everything that is autotrophic.

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