Practice!

Sample Problem

In the light reactions,

Solution

(B) is the correct answer. In the light reactions, electrons pass from Photosystem II to Photosystem I (A). This is a little confusing, but the photosystems were named in the order they were discovered, not the order they come in the reactions. Also, do not confuse hydrolysis with photolysis (C)! Water undergoes photolysis. Hydrolysis is the process of breaking bonds with the addition of a water molecule. Photolysis is the process of breaking down a water molecule using energy from the light.