Aim: Individuals need to have a philosophical critical thinking skill in order to have a reasonable approach to the situations and events they will encounter throughout their lives and to benefit themselves and the society Philosophical critical thinking is a process that enhances individuals' capacity to interrogate, analyse, and assess. In this regard, an inquisitive critical approach acquired at an early age makes important contributions to personality development. The current study aims to examine the text and activity contents in the 3rd grade Life Science textbook according to Matthew Lipman's critical thinking theory. Methodology: Methodologically, document analysis was used in the study. In the 3rd grade Life Science textbook, the main approach in the data on text contents, activity questions and statements are that the statements have both a philosophical and critical meaning. The relevant data were analyzed according to the categories in Lipman's critical thinking approach and presented in tables. Findings: The findings revealed that the questions and statements that meet Lipman's critical thinking categories were insufficient. While the expressions among the categories were predominantly judgment formation and being criterion/measure based, the least common categories were context sensitivity and self-correction. Highlights: In this context, it is essential to consider the developmental stages of primary education students and contemporary educational requirements, while integrating a philosophical critical thinking approach more thoroughly into the curriculum and practices to foster an active and inquisitive student personality.