Assessing the Impact of Inquiry-Based Learning on High School Biology Students’ Conceptual Understanding and Scientific Thinking Skills

Project Abstract

This study investigates how Inquiry-Based Learning (IBL) influences conceptual understanding and scientific thinking skills among high school biology students. Employing a quasi-experimental design, two matched sections of 10th-grade biology classes (n=60) were assigned to an IBL-based instructional condition and a traditional lecture-based control condition over a 12-week unit on cellular biology and genetics. Data were collected through a mixed-methods approach, incorporating standardized concept inventories, open-ended diagnostic assessments, performance tasks, and reflective journals to capture changes in understanding and reasoning processes. The conceptual understanding was measured using a validated biology education assessment with both multiple-choice and constructed-response items targeting core concepts such as cell structure-function, heredity, gene expression, and biological systems thinking. Scientific thinking skills were evaluated with a rubric assessing hypothesis generation, experimental design, control of variables, data interpretation, and critique of evidence. Pre- and post-tests revealed that the IBL group demonstrated statistically significant gains in conceptual understanding (effect size large, p < .01) and in higher-order thinking skills related to experimental reasoning and evidence evaluation compared with the control group. Post-test scores on application and analysis items indicated improved ability to transfer foundational concepts to novel contexts, including analyzing hypothetical scenarios and designing simple investigations to test biological claims. Qualitative data from student journals and think-aloud protocols during problem-solving sessions showed enhanced metacognition, curiosity, and collaborative argumentation in the IBL cohort. The study also identified moderating factors, such as prior content mastery, teacher facilitation quality, and the degree of student collaboration, which influenced the magnitude of learning gains. The discussion interprets findings through the lens of constructivist theory and the science education reform emphasis on inquiry, arguing that sustained engagement in authentic scientific practices fosters deeper conceptual networks and robust reasoning processes. Practical implications include the need for structured scaffolds that gradually release responsibility to enable students to formulate guiding questions, design investigations, and justify conclusions with evidence. The results suggest that IBL can produce meaningful improvements in both what students know and how they think about biology, with implications for curriculum design, teacher professional development, and assessment reform. Limitations include the single-school context and relatively short intervention period, which may affect generalizability; future work should extend to diverse settings, incorporate longitudinal follow-up, and examine differential effects across gender, prior achievement levels, and learning styles. Overall, the findings support the integration of inquiry-centered pedagogy as a viable strategy to enhance high school biology education by fostering conceptual clarity and scientific thinking competencies essential for informed citizenship and future science pursuits.

Project Overview

What This Project Is About

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A plain-language overview of how teaching through inquiry helps students explore biology concepts and develop scientific thinking skills in a real high school setting.

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The Problem It Addresses

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Many biology lessons rely on memorization rather than understanding how to investigate and reason about living systems. This project investigates whether inquiry-based learning helps students form accurate concepts and use evidence to reason about biology problems, which is essential for higher education and informed citizenship.

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Objectives of the Project

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1. Assess changes in students’ conceptual understanding of core biology topics before and after an inquiry-based unit.
2. Evaluate improvements in students’ ability to pose questions, design simple investigations, and interpret data.
3. Compare inquiry-based learning with traditional instruction in terms of engagement and attitudes toward science.
4. Identify practical challenges and supports needed to implement inquiry-based learning in a high school class.

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What You Will Do Step by Step

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1. Review relevant literature on inquiry-based learning and biology education.
2. Design a unit plan where students investigate a biology topic through guided inquiry.
3. Pre-test students’ baseline understanding and inquiry skills.
4. Deliver the unit using student-led investigations and teacher facilitation.
5. Post-test same concepts and skills; collect student reflections and task work.
6. Analyze data to measure conceptual gains and evidence-based reasoning improvements.
7. Compare with a control group taught by traditional methods.
8. Discuss practical implications and suggest classroom strategies for implementation.

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Expected Outcome

Anticipated results include stronger conceptual understanding, enhanced inquiry skills, and a more positive attitude toward science, providing a blueprint for effective classroom practices that foster scientific thinking.