Reactions And Reactions Of Photosynthesis

Good Essays
Photochemical Reactions of Photosynthesis
Lillian Doubrava
Bio 111 - 568
Oct. 28, 2015
TA: Yufeng Wan
In this lab, we experimented with the photochemical reactions of photosynthesis. In the first experiment, by putting test tubes at different distances from a light source, we tested the effects of light intensity. In the second experiment, the effects of light wavelengths and pigments were tested on spinach disks under different colored lights over time to see which light could float the most disks. In the third experiment, by using photosynthetic pigments, we measured absorbance to see which wavelengths of light were used for photosynthesis.
The purpose of this lab was to identify the requirements and products of the photochemical reactions of photosynthesis by specifically looking at the effects of light intensity, light wavelength, and the activity of photosynthetic pigments. Photosynthesis is amongst the most important biochemical processes on earth because it is how the biosphere gets its chemical energy, which is fixed from solar energy. Photochemical, or light, reactions are light dependent and instantaneous reactions that capture energy and split water molecules to release oxygen. They also activate the electron transport chain. In the first experiment, our hypothesis was that the medium light position, 30 cm away, would have the greatest absorption because it is not too close or too far from the light source for absorption. In the second
Get Access