ABSTRAKPenelitian ini merupakan penelitian tindakan kelas yang bertujuan untuk mendeskripsikan peningkatan hasil belajar, keterampilan proses sains dan aktivitas belajar siswa dilaksanakan dalam tiga siklus.Subjek dalam penelitian ini adalah seluruh siswa kelas X MIPA A SMA Negeri 2 Kota Bengkulu yang berjumlah 32 orang. Hasil penelitian ini menunjukkan bahwa hasil belajar siswa dalam aspek pengetahuan atau tes soal pada siklus I diperoleh daya serap siswa 63% dan ketuntasan belajar 16% (belum tuntas), meningkat pada siklus II diperoleh daya serap siswa 74% dan ketuntasan belajar 56% (belum tuntas), dan meningkat lagi pada siklus III diperoleh daya serap siswa 80% dan ketuntasan belajar 87% (tuntas). Skor rata-rata keterampilan proses sains siswa pada siklus I sebesar 70, pada siklus II sebesar 83, dan pada siklus III sebesar 88, dan aktivitas belajar siswa pada siklus I dengan rata-rata skor sebesar 20 dalam kategori cukup, siklus II sebesar 24,3 dalam kategori baik, dan pada siklus III sebesar 27,9 dalam kategori baik. Untuk penelitian selanjutnya sebaiknya menggunakan teknik pengumpulan data yang lebih lengkap untuk meneliti keterampilan proses sains agar dapat melihat hasil yang maksimal. ABSTRACTThis research was a classroom action research aimed to describe student learning outcomes, science process skill student's and the learning activites conducted in three cycle. Subjects in this study were all students of class X MIPA A which amounted to 32 people. The results of this study indicated Students' learning outcomes in the knowledge or test aspects of the first cycle obtained by students absorption 63% and mastery learn 16% (not yet completed), increased in cycle II obtained by students absorbance 74% and mastery learn 56 % (not yet completed), and increased in cycle III obtained by students absorption 80% and mastery learn 87% (completed). Science process skill student's score in cycle I is 70, in the second cycle of 83, the third cycle of 88. Student learning activity in cycle I with average score of 20 in category enough, cycle II of 24,3 in good category, and cycle III equal to 27,9 in good category. For further research should use more complete data collection techniques to examine the science process skills in order to see the maximum results.
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