Light Dependent Reactions
In the picture above, the left reaction is the one we will be focusing on first. This picture depicts the reaction very well and shows the basics of what is happening. H2O, or water, is being absorbed by the root ends and is transported into the stem of the plant. Once in the stem water is transported by the xylem tissues, through the leaf, and to the site of photosynthesis, the chloroplasts.
Finally, wrapping things up. Oxygen is a waste product, made because the energy from the sun split water into O2 and H. Hydrogen being needed later is taken, and oxygen is expelled from the plant. Also ATP and NADPH are made. ATP is made by the ATP synthase channel protein. This is because electrons are trying to even out the concentration gradient and travel through the aforementioned channel protein. As they are traveling through they provide the energy to synthesis ATP through a process called chemiosmosis. NADPH is made by the redox reactions when two high energy electrons and a H+ ion join with NADP+ to make NADPH. Both NADPH and ATP are sent to the calvin cycle when synthesized.