Science subjects, especially Biology, require students to understand something not only macroscopic but also microscopic. Therefore, most students are less able to understand biology materials, especially those that are microscopic. The purpose of the study was to improve the learning outcomes of seventh-grade students at SMP Muhammadiyah 9 Bojonegoro after applying project-based learning to the material on Cells and Life Organization. The type of research is Classroom Action Research (PTK), which was conducted in two cycles. Each cycle consists of four stages: planning, implementation, observation and evaluation, and reflection. The research subjects were the VII grade of SMP Muhammadiyah 9 Bojonegoro, totaling 23 students. The research instrument used was a test sheet. The research data was analyzed descriptively and quantitatively. Data analysis showed that the average pre-cycle learning outcome was 63.5 with 17.4% classical completeness. In cycle 1, the average learning outcome was 81.1 with 65.2% classical completeness. In cycle 2, the average learning outcome was 88.3, with 91.3% classical completeness. Based on the data analysis, it can be concluded that project-based learning can improve the learning outcomes of seventh-grade students at SMP Muhammadiyah 9 Bojonegoro.
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