The purpose of this study was to investigate what kind of conceptions elementary school student teachers have regarding photosynthesis and whether or not a refutational text fosters an understanding of the phenomenon more effectively than a traditional, nonrefutational text. The authors were also interested in how the level of learners’ previous knowledge was connected to learning via different text types. The results indicate that pre-service elementary school teachers’ understanding of photosynthesis was relatively poor before they read the text. However, after reading the text, the participants achieved significantly better results, and thus the intervention was successful. The results also indicate that the refutational text supported students’ learning of photosynthesis more than the traditional, non-refutational text.