In 2013, the Indonesian government implemented a new curriculum, namely Curriculum 2013 (C-13). The C-13 applies scientific approach in the learning process. This research aimed at depicting teachers performance in implementing the scientific approach with 5Ms in schools, including observing (Mengamati), questioning (Menanya), experimenting (Mencoba), Reasoning (Menalar), and communicating the results (Mengomunikasikan). This survey research was conducted in the years of 2013-2015 in eight

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... r high schools, involving 8 principals/vice principals, 16 biology teachers, and 80 students, and in 100 observable lessons. The data in this study were collected using a questionnaire, interview and observation. The data were subsequently analysed with descriptive quantitative. The results indicate that the teachers strived in implementing the scientific approach through 5Ms. The percentage of teachers who were good category in conducting the scientific approach was as follows: (1) Observing (M1) was 22.7%, (2) Asking questions (M2) was 27.8%, (3) Doing experiments (M3) was 23.9%, (4) Reasoning (M4) was 7.9%, and (5) Communicating (M5) was 18%. Therefore, it was concluded that the teachers still needed more training in conducting the scientific process through 5Ms in the implementation of the revised curriculum.