<![CDATA[This study aimed to improve students' conceptual understanding and learning activeness in Biology in a Grade X class at SMAN 3 Pamekasan by implementing the Problem-Based Learning (PBL) model on the topic of environmental change. Classroom action research was employed to examine improvements in conceptual understanding and students' active participation during instruction. Data were collected through observation and written tests administered within the PBL implementation. Essay test scores and observation sheets were presented in tables and graphs to facilitate analysis. In Cycle I, the mean score for students' conceptual understanding reached 86.33 and increased in Cycle II to 92.39, indicating a high level of mastery. Meanwhile, student activeness in Cycle I was 64% (categorized as "adequate"), and it increased substantially in Cycle II to 91% (classified as "very active"). These findings suggest that the PBL model is effective in enhancing conceptual understanding and student engagement in Biology learning.]]>
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