Tujuan penelitian ini untuk mengetahui pengaruh Penerapan Model Pembelajaran Discovery Learning terhadap Hasil Belajar Biologi Siswa Kelas VIII SMP Negeri 2 Tarakan pada Materi Sistem Respirasi Manusia. Penelitian ini dilakukan selama bulan Februari 2015 di SMP Negeri 2 Tarakan. Penelitian ini menggunakan eksperimen semu (quasi eksperiment) dengan populasi seluruh siswa kelas VIII SMP Negeri 2 Tarakan Tahun Ajaran 2014/2015, dan sampel yaitu kelas VIII-G sebagai kelas kontrol dan kelas VIII-J sebagai kelas eksperimen. Teknik pengambilan sampel menggunakan Random Sampling dan teknik pengumpulan data menggunakan dokumentasi, observasi dan tes pilihan ganda. Data dianalisis menggunakan software SPSS 16.0 for Windows. Teknik analisis data menggunakkan analisis statistik multivariat (Manova). Hasil penelitian menunjukkan bahwa: (1) Terdapat pengaruh penerapan model pembelajaran discovery learning terhadap hasil belajar biologi dalam ranah pengetahuan, sikap, dan ketrampilan (F = 9,581; p < 0,05), (2) Terdapat pengaruh penerapan model pembelajaran discovery learning terhadap hasil belajar biologi dalam ranah pengetahuan (F = 10,088; p < 0,05), (3) Terdapat pengaruh penerapan model pembelajaran discovery learning terhadap hasil belajar biologi dalam ranah sikap (F = 7,093; p < 0,05), (4) Terdapat pengaruh penerapan model discovery learning terhadap hasil belajar biologi dalam ranah ketrampilan (F = 12,308; p < 0,05).

The objectivities of this study were to find out effect of Discovery learning model to the biological learning result in grade VIII SMP Negeri 2 Tarakan in human respiration system subject. This research was conducted during on February 2015 in SMP Negeri 2 Tarakan. This is quasi-experimental study (quasi experiment) and the population for this study was the students in all eight grade of SMP Negeri 2 Tarakan in even semester 2014/2015, and the sample is from grade VIII-J as the control class and grade VII-G as the experiment class. The sampling technique using random sampling and data collection techniques using observation and tests method (multiple choice) . The data that had been obtained was analyzed by using SPSS 16.0 for Windows software. The data was analyzed using multivariate analysis of variance (Manova). The result of the research shows that: (1) There is effect of the application Discovery Learning model to the result of learning biology through knowledge, social attitude, and skills (F = 9,581; p < 0,05), (2) There is effect of the application Discovery Learning model to the result of learning biology trough knowledge (F = 10,088; p < 0,05), (3) There is effect of the application Discovery Learning model to the result of learning biology trough attitude (F = 7,093; p < 0,05), (4) There is effect of the application Discovery Learning model to the result of learning biology trough skills (F = 12,308; p < 0,05).