Overall photosynthesis and cellular respiration are defined as life-sustaining processes. They share a mutual beneficial relationship, both of them cannot occur without the presence of the other. Photosynthesis takes place in its own efficient series of steps. However, there are some noticeable similarities between photosynthesis and cellular respiration. For instance, they both involve series of Redox Reaction. In cellular respiration, electrons transport from glucose to oxygen, forming water and releasing energy. In photosynthesis, they go in the opposite direction, starting in water concluding to form glucose.
Like cellular respiration, photosynthesis also uses electron transport chain to make H+ concentration gradient to make ATP.