Pendidik sangat berperan penting dalam mengembangkan perangkat pembelajaran yang menarik dan sesuai dengan kebutuhan siswa. Tujuan penelitian ini adalah untuk mengetahui validitas, kepraktisan dan keefektifan penuntun praktikum berbasis inkuiri terbimbing pada materi plantae kelas X SMA. Model pengembangan yang dilakukan dalam penelitian ini adalah model Analysis, Design, Development, Implementation and Evalution (ADDIE). Subjek penelitian yang terdiri dari 25 siswa kelas X MIPA 1 dan 1 guru biologi SMAN 1 Tabulahan. Data validitas penuntun didapatkan dari validator ahli media materi, data kepraktisan didapatkan dari hasil analisis angket respon guru dan siswa terhadap media penuntun, sedangkan data efektivitas didapatkan dari hasil analisis data hasil belajar siswa. Hasil analisis data validitas penuntun menunjukkan tingkat validitas sebesar 4,23 yang termasuk kategori valid, sedangkan hasil analisis data kepraktisan berdasarkan angket respon guru dan siswa sebesar 84 % dan 82,84% dengan kategori sangat praktis serta hasil analisis berdasarkan tes hasil belajar diperoleh 68 % dengan kategori efektif. Hasil penelitian dan pengembangan ini menunjukkan bahwa penuntun praktikum berbasis inkuiri terbimbing valid, praktis dan efektif untuk digunakan sebagai sumber belajar siswa.

Educator play a very important role in developing learning tools that are iteresting and appropriate to students needs. The aim of this research is to determine the validity, practicality and effectiveness of guided inquiry-based practicum products in plantae material for class X SMA. Development model used in this research is the model Analysis, Design, Development, Implementation and Evaluation (ADDIE). The research subjects consisted of 25 students of class X MIPA 1 and 1 biology teacher at SMAN 1 Tabulahan. Data on the validity of the guiding obtained from media expert validator, practical data material obtained from the results questionnaire analysis of teacher and student responses to guiding , while data effectiveness is obtained from the results of data analysis of student learning outcomes. Analysis results guidance media validity data shows a validity level of 4,23 included in the valid category, while the results of the practicality data analysis were based on teacher and student response questionnaires were 84% and 82,84% in the very practical category and the results of analysis based on learning outcomes tests were 68% with effective category. The results of this research and development shows that guided inquiry�based practicum guidance is valid, practical and effective for use as a student learning resource.