This diploma thesis deals with the issue of the influence of teaching with the help of an interactive textbook on the effectiveness of teaching the photosynthesis of aquatic plants. The work is divided into two parts - literature research and analysis of research results. The theoretical part follows on from the bachelor's thesis, which deals with testing students' knowledge of the photosynthesis of aquatic plants. The literary part describes the inclusion of photosynthesis in critical topics in the teaching of natural history and the anchoring of the topic of photosynthesis in the content of natural history and chemistry textbooks. The conclusion of the theoretical part describes the pupils' knowledge of the photosynthesis of aquatic plants and the teaching of environmental education and ecology. The practical part consists of a survey among ninth grade students selected from three elementary schools. An integral part of the investigation is an interview with primary school teachers who teach science. In the interview, questions focused on the issue of digital textbook evaluation are asked. The overall evaluation of the survey shows a positive impact of working with an electronic interactive textbook on pupils' knowledge of photosynthesis and a skeptical view of teachers on working with an interactive textbook