Penelitian ini bertujuan untuk mengetahui kualitas Butir Soal Ujian Akhir Semester Genap Pada Mata Pelajaran Biologi Kelas X SMA Muhammadiyah Tarakan. Penelitian ini dilakukan pada bulan Juni 2015 di SMA Muhammadiyah Tarakan. Penelitian ini merupakan penelitian deskriptif kuantitatif dengan populasi seluruh butir soal beserta lembar jawaban Ujian Akhir Sekolah mata pelajaran Biologi siswa keals X SMA Muhammadyah Tarakan. Sampel dalam penelitian ini 50% dari lembar jawaban masing-masing paket soal . Teknik pengambilan sampel menggunakan proporsional random sampling dan teknik pengumpulan data menggunakan dokumentasi dan wawancara. Data dianalisis menggunakan software AnatesV.4 for Windows. Berdasarkan hasil analisis data dapat disimpulkan bahwa, secara kualitatif pada soal paket 1, 82,5% soal berkualitas, 15% kurang berkualitas, dan, 2,5% Tidak berkualitas. Soal paket 2, 85% soal berkualitas, 15% kurang berkualitas, dan tidak ada (0%) soal yang tidak berkualitas. Soal paket 3 87,5% soal berkualitas, 12,5% kurang berkualitas, 0% tidak berkualitas. Distribusi taksonomi bloom yang terukur yaitu, pada soal paket 1 C1 90%, C2 5%, C3 5%, C4 0%, dan C6 0%. Soal paket 2, C1 85%, C2 10%, C3 5%, C4 0%, C5 0%, dan C6 0%. Pada soal paket 3, C1 90%, C2 2,5%, C3 7,5%, C4 0%, C5 0%, dan C6 0%. Secara kuantitatif pada soal paket 1, 10% soal berkualitas, 30% kurang berkualitas, dan 60% tidak berkualitas. Soal paket 2, 17,5% soal berkualitas, 32,5% kurang berkualitas, dan 50% soal tidak berkualitas. Soal paket 3, 17,5% soal berkualitas, 32,5% kurang berkualitas, dan 50% soal tidak berkualitas

This study aims to determine the quality Item End Semester Exam By Subject Biology Class X SMA Muhammadiyah Tarakan. This study was conducted in June 2015 at SMA Muhammadiyah Tarakan. This research is quantitative descriptive matter together with the answer sheet populasiseluruhbutir School Final Examination subjects Biology students keals X SMA Muhammadiyah Tarakan. The sample in this study 50% of the answer sheet about each package. The sampling technique using proportional random sampling and data collection techniques using documentation and interviews. Data were analyzed using software AnatesV.4 for Windows. Based on the results of data analysis, qualitatively at about package 1, 82.5% of quality problems, 15% less qualified, and, 2.5% Not qualified. Problem 2 packages, 85% of quality problems, 15% less qualified, and no (0%) that is not a matter of quality. Problem 3 87.5% package of quality problems, 12.5% less qualified, 0% is not qualified. Distribution measured bloom taxonomy that is, at about 90% package 1 C1, C2 5%, 5% C3, C4 0%, and 0% .Soal C6 package 2, 85% C1, C2 10%, 5% C3, C4 0 %, 0% C5, and C6 0% .At about 3 package, 90% C1, C2 2.5%, 7.5% C3, C4 0%, 0% C5, and C6 0%. Quantitatively items package 1, 10% of quality problems, 30% less qualified, and 60% are not qualified. Problem pack 2, 17.5% of quality problems, 32.5% less qualified, and 50% are not a matter of quality. Problem pack 3, 17.5% of quality problems, 32.5% less qualified, and 50% about not qualified