<![CDATA[This study aims to develop a booklet based on research findings on the tissue culture of Sonneratia alba as a learning material for the Modern Biotechnology topic in Grade X of Senior High School under the Merdeka Curriculum. The main problem identified in schools is students’ low understanding of tissue culture due to limited learning resources and the lack of practical laboratory activities. The booklet was developed using the Research and Development (R&D) model with an ADDIE approach simplified into three stages: Analysis, Design, and Development. Primary data were obtained from research on the effects of NAA and BAP hormone combinations on the in vitro germination of Sonneratia alba, which served as the basis for the booklet content. Product validation was carried out by media and material experts using a Likert-scale assessment sheet. The media expert validation obtained a percentage of 100% (very valid), while material expert validation reached 94.1% (very valid). The overall average validity of the booklet was 97.05%, which falls into the very valid category. Thus, the Sonneratia alba tissue culture booklet is suitable for use as a practical, engaging, and relevant supplementary learning resource to enhance students’ understanding of Modern Biotechnology.]]>
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