During photosynthesis, the following reaction takes place: carbon dioxide + water + light energy → sugar + oxygen during cellular respiration, the following reaction takes place: sugar + oxygen → carbon dioxide + water + chemical energy given this information, how are photosynthesis and cellular respiration related? question 1 options: photosynthesis and cellular respiration both start with the same materials. the products of photosynthesis are the reactants of cellular respiration. the same type of energy is found in both photosynthesis and cellular respiration. photosynthesis and cellular respiration both produce the same materials.