Biology laboratories play an important role in supporting practical learning activities and developing students’ scientific skills in science education. Effective laboratory management and adequate facilities are necessary to ensure that practical activities are conducted safely and optimally. This study aimed to analyse: (1) the management of biology laboratories, (2) the completeness of biology laboratory facilities and materials, and (3) the implementation of laboratory management practices in public senior high schools in Malang City. This study employed a descriptive research design using percentage-based statistical analysis. The population consisted of 10 public senior high schools in Malang City, and 3 schools were purposively selected based on school zoning representation and Accreditation A status. The respondents included biology teachers, laboratory heads, and laboratory assistants. Data were collected through observations, questionnaires, interviews, and documentation. The research instruments were validated through expert judgment by biology education lecturers. The results showed that overall management of biology laboratories was rated very good, with an average score of 87.69%. Material ordering, storage, and safety and maintenance management were generally implemented effectively. The completeness of biology laboratory facilities and materials was also categorised as very complete, with an average percentage of 89.20%. However, several weaknesses remained, particularly in hazardous waste disposal, laboratory safety practices, and infrastructure maintenance. Overall, biology laboratories in public senior high schools in Malang City were adequately managed and equipped to support biology practical learning activities.
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