Impact of Inquiry-Based Learning on Conceptual Understanding and Scientific Thinking in High School Biology: A Final-Year Project

Project Abstract

This study investigates the impact of inquiry-based learning (IBL) on students’ conceptual understanding and scientific thinking in high school biology, aiming to inform instructional design and policy within secondary education. A quasi-experimental design with matched classrooms was employed in two public high schools over one academic term. One group engaged in an IBL-infused biology curriculum that emphasized student-generated questions, guided investigations, data analysis, and iterative hypothesis testing, while the control group followed a traditional instruction model prioritizing teacher-led demonstrations and rote memorization. Data were collected using a mixed-methods approach, combining quantitative measures of conceptual understanding (biology concept inventories and practical assessment scores) and scientific thinking (formative reasoning tasks, argumentation quality rubrics, and data interpretation exercises) with qualitative insights from classroom observations, student interviews, and teacher journals. Quantitative results indicated that the IBL group demonstrated statistically significant gains in conceptual understanding across core biology topics, including cellular processes, genetics, and ecology, with effect sizes in the moderate range (Cohen’s d ? 0.45–0.70). Improvements in scientific thinking were observed in evidence-based reasoning, hypothesis evaluation, experimental design, and data interpretation, yielding higher scores on standardized rubrics and improved performance in authentic laboratory tasks. The control group showed modest gains that aligned with expected curricular progression but did not reach the magnitude experienced by the IBL cohort. Mediation analyses suggested that enhanced engagement, collaborative discourse, and formative feedback were key mechanisms through which IBL influenced outcomes. Qualitative findings corroborated the quantitative results, revealing that students in the IBL condition developed deeper conceptual links, transferred knowledge to novel scenarios, and articulated reasoned arguments supported by empirical data. They also demonstrated greater metacognitive awareness, regulatory behaviors during investigations, and increased persistence when addressing complex or ambiguous problems. Teacher reflections highlighted challenges such as time management, the need for scaffolding to support novice inquiry, and the importance of structured assessment to align inquiry tasks with learning objectives. Classroom discourse analyses identified more frequent use of evidence-based explanations, peer questioning, and collaborative sense-making in the IBL setting. The study discusses implications for curriculum design, teacher professional development, and assessment practices, emphasizing that successful integration of IBL requires clear learning trajectories, targeted scaffolds for argumentation and data literacy, and alignment between inquiry tasks and standardized assessment benchmarks. Limitations include the finite study duration, potential teacher bias in implementing IBL, and the variability in student prior experience with inquiry. The findings contribute to the evidence base supporting IBL as a viable strategy to enhance both conceptual understanding and scientific thinking in secondary biology, with practical recommendations for scalable, equity-focused implementation in diverse classroom contexts.

Project Overview

What This Project Is About

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A plain-language overview of how teaching through asking questions and exploring ideas (inquiry-based learning) can affect how students understand biology concepts and think like scientists in high school classes. The project compares traditional teaching with inquiry-based activities to see which approach helps students grasp ideas better and reason about biological problems more clearly.

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The Problem It Addresses

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Many high school biology lessons focus on memorization rather than true understanding or scientific thinking. This project tackles whether letting students investigate, design experiments, and discuss findings leads to deeper learning and better problem-solving. It also considers how teachers can implement inquiry-based methods in real classrooms and what supports are needed for success.

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Objectives of the Project

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1. Determine whether inquiry-based activities improve conceptual understanding in biology topics such as genetics, ecology, and physiology.
2. Assess changes in students’ scientific thinking skills, including questioning, data interpretation, and evidence-based reasoning.
3. Compare student engagement and motivation between inquiry-based and traditional teaching methods.
4. Identify practical steps and resources teachers can use to adopt inquiry-based learning.
5. Suggest assessment approaches that align with inquiry-based learning outcomes.

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What You Will Do Step by Step

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1. Review literature on inquiry-based learning and biology education.
2. Design a teaching module that uses inquiry activities for selected biology topics.
3. Implement the module in partner classrooms and collect student work, quizzes, and reflections.
4. Measure concept understanding with pre/post tests and analyze reasoning in student explanations.
5. Compare results with a control group taught by traditional methods.
6. Analyze data for trends, significance, and effect sizes.
7. Gather teacher feedback on feasibility and obstacles.
8. Summarize findings and provide practical recommendations for classrooms.

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Expected Outcome

A clearer indication of whether inquiry-based learning enhances understanding and scientific thinking in high school biology, along with practical guidelines for implementation and possible improvements for future studies.