AbstractThe purpose of this investigation was to determine the effects of using laboratory photomicrography as a motivational technique in the teaching‐learning processes involved in the study of microbiology in Nigerian secondary schools. This was done by comparing the posttest scores and the questionnaire responses made by three equal groups of randomly sampled and assigned students taught the same microbiology content material by lectures and photomicrography used as an adjunct to the laboratory, lectures, and laboratory activities and lectures alone. Each group was taught by a different microbiology teacher. The results of this study, as shown in Tables I through V permitted the conclusion that students taught microbiology by lectures with photomicrography activities achieved the highest posttest mean score and expressed the opinion that they were highly motivated by this teaching method. Students taught microbiology by lectures with laboratory activities achieved lower mean posttest score and expressed the opinion that they were only fairly motivated by this teaching approach. Students taught microbiology by lectures alone achieved the lowest mean posttest score and expressed the opinion that they were least motivated by this teaching approac