Investigating the Effectiveness of Inquiry-Based Learning in Enhancing Conceptual Understanding of Photosynthesis Among High School Students Using a Blended Learning Approach

Project Abstract

This study investigates the effectiveness of inquiry-based learning (IBL) integrated with blended learning to enhance conceptual understanding of photosynthesis among high school students. A quasi-experimental design was employed in two matched sections of senior secondary science classes across three schools over a 12-week term. The experimental group engaged in a structured IBL sequence driving questions, collaborative inquiry, experimental investigations, and reflective discourse facilitated through a blended platform that combined online simulations, virtual labs, and in-class hands-on activities. The control group followed a conventional teacher-centered pedagogy with standard laboratory activities and traditional assessments. Conceptual understanding was assessed using a validated photosynthesis concept inventory designed to probe core misconceptions, including the role of chloroplasts, light-dependent and light-independent reactions, gas exchange, and energy transfer in the Calvin cycle. Mixed-method data were collected, comprising pre- and post-tests, delayed post-tests at four weeks, classroom observations, think-aloud protocols during key tasks, and semi-structured interviews with students and science teachers. Quantitative analysis used ANCOVA to compare post-test scores while controlling baseline achievement, and effect sizes (Cohen’s d) quantified the magnitude of learning gains. Qualitative data were analyzed thematically to explore the depth of conceptual change, students’ epistemological shifts, engagement patterns, collaboration dynamics, and perceptions of the blended learning environment. Results indicated that the IBL-blended condition produced statistically significant gains in conceptual understanding compared to the control, with a moderate to large effect size (d ? 0.60–0.85 across schools) and higher retention of core concepts at the delayed post-test. Students in the experimental group demonstrated fewer persistent misconceptions related to enzyme function, energy coupling, and the distinction between ATP and NADPH, suggesting deeper mental integration of photosynthetic processes. The blended component appeared to enhance metacognitive awareness through structured reflection prompts, progress dashboards, and accessible simulations that allowed for iterative testing of hypotheses. Classroom observations revealed higher levels of student curiosity, collaborative justification of ideas, and productive scientific discourse, though challenges included technological access disparities and the need for sustained teacher facilitation to maintain inquiry quality. Interviews highlighted perceived relevance to real-world contexts, greater autonomy in learning pathways, and perceived improvements in scientific argumentation and data interpretation. The study discusses implications for curriculum design, suggesting a scalable framework for integrating IBL with blended learning in high school biology, including recommended scaffolds, assessment rubrics, and professional development for teachers. It also acknowledges limitations such as sample size, potential novelty effects, and variability in implementation fidelity. Recommendations for future research include longitudinal studies across diverse curricula, exploration of gender and achievement subgroups, and integration of adaptive analytics to tailor inquiry sequences to individual learner needs. Overall, the findings support the premise that well-structured IBL within a blended learning environment can enhance conceptual comprehension of photosynthesis and foster more authentic scientific inquiry among high school students.

Project Overview

What This Project Is About

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The project explores how teaching methods that guide students to discover ideas (inquiry-based learning) affect students’ understanding of how photosynthesis works. It also tests whether mixing online and hands-on learning (blended learning) helps students grasp concepts more clearly than traditional teaching.

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The Problem It Addresses

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Objectives of the Project

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1. Assess how inquiry-based activities affect conceptual understanding of photosynthesis.
2. Compare blended learning with conventional teaching in supporting these concepts.
3. Identify which aspects of inquiry prompts most improve learning outcomes.

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What You Will Do Step by Step

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1. Review basic photosynthesis concepts and current teaching methods. 2. Design inquiry-based activities (questions, experiments, think-pair-share) suitable for a high school setting. 3. Develop a blended-learning plan with online simulations and in-class activities. 4. Recruit a class and collect pre-tests, post-tests, and student reflections. 5. Analyze data to compare learning gains between groups. 6. Reflect on challenges and refine activities for scalability.

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Expected Outcome

The project is expected to show greater gains in understanding photosynthesis for students who engage in inquiry-based, blended learning activities, along with insights into which activities are most effective and practical recommendations for teachers.