Indonesia is a mega-biodiversity country that has a number offlora and fauna number 2worldwide. Biological diversity useful for the purposes offood, clothing, and shelter. Based on theresults of pre-study showed that the majority (80%) of biodiversity in school learning use thelecture method and of course have not touched the realm of attitudes to conserve. The goal of theresearch is to develop the attitude of preserving biodiversity in the candidate educators throughlearning outside the classroom and challenging task. Subjects in this study were students ofbiology education study program participant subjects generation plant diversity by 2012 consist of36 students, 5 male students, and 31 female students. This type of research is the ClassroomAction Research (CAR) conducted during two cycles, the research approach is qualitativedescriptive. Data analysis was done by triangulation of data and percentages. Observationsattitudes using Likert scale, observation sheets, and field notes. The results showed no increase inthe attitude of students as prospective educators before the first cycle, at the end of the first cycleand the end of the second cycle. Biology teacher recommended to apply this method, method toconduct learning outside the classroom and give challenging task in middle and high schoolstudents.