The application of cooperative learning model type problem base learning (PBL) to increase the learning activities of students of class XII MIA 3 in SMA Negeri 1 Padang

This study is a classroom action research which aims to apply the Problem Based Learning (PBL) model as an effort to improve the learning activities of class XII MIA 3 SMA Negeri 1 Padang students. This research is conducted in two cycles on genetic substance material. Each cycle consists of four stages, namely planning, implementing, observing, and reflecting. The instrument used in this study is the student's observation sheet as a form of reflection in each cycle. Six aspects that observed were working on the student's worksheets, working together/discussing in groups, observing presentation activities, giving responses/questions, paying attention to teacher explanations, answering questions or giving opinions. The results showed that the learning activities of students through the application of the PBL model were classified as good category. This category based on an increase of student's activities from the first cycle with an average achievement score of 60% (good category) to cycle II with an average achievement score of 76% (very good category).