Evaluating the Impact of Inquiry-Based Learning on Secondary Biology Students' Understanding

Thesis Abstract

The pervasive reliance on traditional rote-learning approaches in secondary biology education has often resulted in superficial understanding and limited application of scientific concepts among students, underscoring the need for pedagogical strategies that foster active engagement and critical thinking. This study investigates the impact of inquiry-based learning (IBL) on students’ conceptual understanding of biology, aiming to provide empirical evidence on its effectiveness in enhancing scientific literacy and fostering inquiry skills within secondary education contexts. The specific objectives include examining students’ conceptual gains post-intervention, exploring shifts in their attitudes towards science, and identifying factors that influence the efficacy of inquiry-based methods. Using a quasi-experimental research design, the study involved a total of 200 secondary school students from four publicly funded schools within a metropolitan area, with two schools assigned as the experimental group employing inquiry-based pedagogies and two as controls utilizing conventional teaching methods. Stratified random sampling was used to select participants to ensure balanced representation across gender and academic performance levels. Data collection instruments comprised standardized biology concept inventories, Likert-scale attitude questionnaires, and observational checklists to monitor instructional fidelity. Pre- and post-intervention assessments were administered over a full academic term of 16 weeks, with the validity and reliability of all instruments confirmed through pilot testing, Cronbach’s alpha coefficients exceeding 0.80, and expert validation. Data analysis involved descriptive statistics to profile baseline characteristics and paired t-tests to evaluate within-group knowledge gains. Independent samples t-tests compared post-test scores between experimental and control groups, while Analysis of Covariance (ANCOVA) controlled for initial differences. Thematic analysis was applied to qualitative data derived from classroom observations to elucidate instructional dynamics and student engagement patterns, providing contextual insights into quantitative findings. The study also employed multiple regression analysis to identify predictors of conceptual improvement, considering variables such as prior knowledge, attitude scores, and frequency of inquiry activities. Expected findings suggest that students engaged in inquiry-based learning exhibit statistically significant improvements in their understanding of biology concepts, with effect sizes indicating pedagogical relevance. Furthermore, the experimental group is anticipated to demonstrate more positive attitudes towards science, fostering higher motivation and sustained interest. Instructional quality and student active participation are predicted to significantly influence learning outcomes, emphasizing the importance of well-structured inquiry experiences. These results are expected to align with constructivist learning theories, particularly Piaget’s theory of cognitive development and Vygotsky’s social constructivism, which advocate for learner-centered approaches that promote meaningful knowledge construction. This research contributes to the body of knowledge by providing rigorous empirical evidence supporting inquiry-based pedagogies as effective tools for improving biological understanding among secondary students. It advances theoretical understanding of how inquiry activities translate into conceptual mastery and informs curriculum development and teacher training practices. The study concludes that integrating inquiry-based approaches within biology classrooms can substantially enhance both learning outcomes and students’ scientific attitudes, recommending systematic teacher professional development and curriculum reforms to embed inquiry at the core of biology education. Future research should investigate long-term retention effects and explore the integration of digital inquiry tools to further augment student engagement and understanding.