The purpose of this study is to determine how effectively biology instructors at high schools connected with the Ministry of National Education identify trees in their immediate surroundings in the context of trees, which are critical to the notion of biodiversity. The population comprises of biology instructors who worked in high schools in various regions of Turkey during 2020 and 2021 under the auspices of the Ministry of National Education. The research sampled 262 biology teachers volunteer using an accessible sampling technique. The research model is a relational one that is based on the general survey model, a quantitative research technique. Mercan and Koseoglu's (2019) "Given Tree Recognition (GTR) Test" was used to gather data for the study. The Mann Whitney U Test was used to compare matched groups and the Kruskal-Wallis H test was used to compare more than two groups in the analysis of the data collected throughout the study. According to the study's results, biology instructors' capacity to identify trees in their immediate surroundings is limited. It is deemed critical to ascertain biology instructors' degree of recognition of trees in their immediate surroundings, since the research's findings begin with an understanding of the importance of biodiversity, which is one of the most critical problems in the conceptual framework of biology teaching.