<![CDATA[Science learning on Ecology and Biodiversity in schools is still dominated by rote-learning textbooks and closed exercises, causing students difficulty in connecting science concepts with real environmental phenomena. Therefore, the development of practical and applicable contextual teaching materials is an urgent necessity to support the implementation of the Merdeka Curriculum. This study aims to develop Student Worksheets (LKPD) based on Contextual Teaching and Learning (CTL) and evaluate their validity and practicality in science learning. This study employed a Research and Development (R&D) method using the ADDIE model (Analysis, Design, Development, Implementation, Evaluation). The trial was conducted in the second semester of the 2025/2026 academic year at SMP Negeri 9 Banjarbaru, involving 5 expert validators, 5 science teachers, 10 students for small-group trials, and 30 seventh-grade students for field trials. Data were collected using validation sheets and Likert-scale response questionnaires, then analyzed using descriptive percentage techniques. Expert validation results showed that the LKPD achieved a validity percentage of 91.2% (very valid category). In the implementation stage, the LKPD achieved an average practicality score of 89.9% (very practical category), supported by a teacher response of 90.8% and a student response of 89.0%. These findings prove that the developed CTL-based LKPD is highly valid, practical, and effectively facilitates active student engagement through direct observation of ecological phenomena in the school environment. ABSTRAK Pembelajaran IPA pada materi Ekologi dan Keanekaragaman Hayati di sekolah masih didominasi oleh bahan ajar berbasis hafalan teks dan latihan soal tertutup, sehingga peserta didik kesulitan mengaitkan konsep sains dengan fenomena lingkungan nyata. Oleh karena itu, pengembangan bahan ajar kontekstual yang praktis dan aplikatif menjadi kebutuhan mendesak untuk mendukung implementasi Kurikulum Merdeka. Penelitian ini bertujuan untuk mengembangkan Lembar Kerja Peserta Didik (LKPD) berbasis Contextual Teaching and Learning (CTL) serta menguji tingkat kevalidan dan kepraktisannya dalam pembelajaran IPA. Penelitian ini menggunakan metode Research and Development (R&D) dengan model ADDIE (Analysis, Design, Development, Implementation, Evaluation). Uji coba dilaksanakan pada semester genap tahun ajaran 2025/2026 di SMP Negeri 9 Banjarbaru dengan subjek 5 validator ahli, 5 guru IPA, 10 peserta didik uji kelompok kecil, dan 30 peserta didik kelas VII uji lapangan. Data dikumpulkan melalui lembar validasi dan angket respons berskala Likert, kemudian dianalisis secara deskriptif persentase. Hasil validasi ahli menunjukkan bahwa LKPD memperoleh persentase kevalidan sebesar 91,2% dengan kategori sangat valid. Pada tahap implementasi, LKPD memperoleh skor kepraktisan rata-rata sebesar 89,9% (kategori sangat praktis), yang didukung oleh respons guru sebesar 90,8% dan respons peserta didik sebesar 89,0%. Temuan ini membuktikan bahwa LKPD berbasis CTL yang dikembangkan terbukti sangat valid, praktis, dan memfasilitasi keterlibatan aktif peserta didik melalui pengamatan langsung fenomena ekologis di lingkungan sekitar sekolah. ]]>
