Bahan Ajar adalah alat bantu ajar untuk menjelaskan konsep kepada siswa atau mengevaluasi kinerjanya untuk meningkatkan kualitas pembelajaran, salah satunya adalah keterampilan literasi sains di sekolah. Bahan ajar berbasis STSE (sains, teknologi, masyarakat, lingkungan) dapat memfasilitasi keterampilan literasi sains bagi siswa. Materi jamur memiliki kandungan yang bervariasi terkait dengan ilmu pengetahuan, teknologi, masyarakat, dan lingkungan. Siswa dapat melatih keterampilan literasi sains mereka. Penelitian ini bertujuan untuk menjelaskan kelayakan teoritis bahan ajar dwibahasa berbasis STSE pada materi jamur untuk praktik literasi sains siswa kelas X SMA. Kelayakan teoritis diukur berdasarkan validitas produk. Penelitian pengembangan mengacu pada Model Fenrich Instructional Development Cycle yang memiliki tahapan-tahapan seperti analisis, perencanaan, perancangan, pengembangan, dan implementasi, dimana setiap siklus harus dievaluasi dan direvisi. Validitas bahan ajar dinilai oleh ahli pendidikan biologi, ahli materi jamur, dan guru biologi SMA. Data dianalisis secara kualitatif. Bahan ajar yang dikembangkan terhitung mampu melatih kemampuan literasi sains siswa. Berdasarkan hasil validasi tiga komponen yaitu isi 3,87, tampilan 4, dan kebahasaan 3,93. Berdasarkan hasil tiga kriteria kelayakan teoritis diperoleh skor rata-rata 3,93 dengan persentase 98% dengan kategori sangat valid. Dengan demikian bahan ajar tersebut valid dan diharapkan dapat digunakan dalam kegiatan pembelajaran.

Teaching Materials are the teaching aids to explain concepts to students or evaluate their performance to increase the quality of learning, one of which is scientific literacy skills in the school. Teaching material based on STSE (science, technology, society, environment) can facilitate scientific literacy skills for students. Fungi material has to vary content related to science, technology, society, and the environment. The students can practice their scientific literacy skills. The research aimed to explain the theoretical eligibility of bilingual teaching material based on STSE on fungi material to practice scientific literacy for senior high school grade 10^th. The theoretic eligibility is measured based on product validity. The research of development refers to the Model of Fenrich Instructional Development Cycle conceives phases such as analysis, planning, design, development, and implementation, in which every cycle must be evaluated and revised. The validity of the teaching material was assessed by a biology education expert, a fungi material expert, and a biology teacher of senior high school. The data were analyzed qualitatively.  The developed teaching material was counted to be able to practice students' scientific literacy skills. Based on the validation result of three components are content 3.87, appearance 4, and linguistic 3.93. Based on the result of three criteria of theoretical eligibility acquired an average score of 3.93 with a percentage of 98% with a very valid category. Hence the teaching material was valid to use in the learning activity.