The main object of this thesis is to evaluate the results of a case study of teaching the topic of annelids. The study was carried for three years at Podkušnohorské gymnasium grammar school in Most. Another objective is to find the connection between obtained data, activity of students during classes and other chosen factors that may affected a success in the classified test and post-test. The thesis is divided into two parts. First part presents the research part which is devoted to a brief overview of textbooks for second grade of elementary and high school. The second, analytical part, is divided into three subsections. The first subsection is devoted to the evaluation of teaching methods for individual teachers Most schools with an emphasis on the level of activity of students in biology classes. The second subsection analyzes the results of the investigation and commented the results on, especially the success rate of students in the various test phases. The third subsection suggests, based on the data obtained, the best teaching methods to the topic of annelids. Key words: annelids, pupils, pre-test, classification, activity during lesson, knowledge extinction, teacher