<![CDATA[Literasi sains merupakan salah satu keterampilan berpikir tingkat tinggi yang perlu dikembangkan dalam bidang pendidikan abad ke-21. Kompleksitas dan cakupan materi yang luas menjadi faktor rendahnya kemampuan literasi sains siswa, salah satunya materi Ekosistem. Flashcard menjadi salah satu media pembelajaran visual yang memiliki potensi untuk dikembangkan guna meningkatkan literasi sains siswa. Penelitian ini bertujuan pada pengembangan media flashcard berbasis discovery learning berfokus pada materi Ekosistem guna meningkatkan literasi sains khususnya siswa kelas X yang valid, praktis dan efektif. Model 4D dipilih dalam pengembangan flashcard dan dievaluasi berdasarkan validitas, kepraktisan, serta keefektifan. Validitas diperoleh dari penilaian ahli, kepraktisan dari observasi keterlaksanaan pembelajaran dan respon siswa, serta keefektifan dari hasil tes dan ketercapaian indikator literasi sains. Analisis data dilakukan secara deskriptif kuantitatif. Flashcard dinyatakan sangat layak berdasarkan hasil (skor validitas 88%), sangat praktis (observasi keterlaksanaan pembelajaran 100% dan respon positif siswa 98%), serta sangat efektif (nilai N- Gain yakni 0,83 tergolong kategori tinggi dan ketercapaian indikator literasi sains meningkat dari 52% pada pre-test menjadi 92% pada post-test). Dengan demikian, media flashcard berbasis discovery learning pada materi Ekosistem dinyatakan layak digunakan dalam proses pembelajaran serta efektif dalam meningkatkan literasi sains siswa. Kata Kunci: Literasi Sains, Flashcard, Ekosistem, Discovery Learning. Scientific literacy is one of the higher-order thinking skills that needs to be developed in 21st-century scientific literacy skills, including in the Ecosystem topic. Flashcards are a type of visual learning media develop discovery learning-based flashcards focusing on the Ecosystem topic to enhance scientific literacy, particularly for tenth-grade students, by ensuring that the product is valid, practical, and effective. The 4D model was selected for the flashcard development and the product was evaluated in terms of validity, practicality, and effectiveness. Validity was obtained through expert judgment, practicality was measured through classroom implementation observations and student responses, while effectiveness was determined based on test results and the achievement of scientific literacy indicators. Data were analyzed using descriptive quantitative methods. The developed flashcards were considered highly feasible (validity score of 88%), very practical (100% implementation observation and 98% positive student responses), and highly effective (N-Gain score of 0.83 categorized as high, and scientific literacy indicator achievement increased from 52% in the pre-test to 92% in the post-test). Thus, the discovery learning-based flashcard media on Ecosystem material is declared suitable for use in the learning process and effective in improving students' scientific literacy. Keywords: Scientific Literacy, Flashcards, Ecosystem, Discovery Learning.]]>
