1.1 Introduction
Biology is the branch of science that deals with the study of living organisms, their structure, functions, growth, evolution and interactions with the environment (Reece et al., 2011). In science education, practical work refers to learning experiences in which students actively engage in manipulating materials, conducting experiments, observing phenomena and collecting data in order to develop scientific knowledge and skills (Millar, 2010). In secondary schools, Biology is a core science subject that plays a significant role in preparing learners for careers in medicine, agriculture, biotechnology and environmental sciences. However, the effective teaching and learning of Biology concepts often depends on how well practical activities are integrated into classroom instruction. Practical work provides learners with opportunities to connect theoretical knowledge with real-life experiences, thereby enhancing understanding, retention and interest in the subject.
As a prelude to other parts of this study, this chapter will discuss the background upon which this study was initiated, the statement of problems that led to this study, the Aim and Objectives of the study. Others are significance of the study, scope of work, research hypothesis and questions, limitation of the study and definition of terms.
1.2 Background of Study
Biology is a fundamental science subject that focuses on the study of living organisms, their structure, functions, interactions and relationships with the environment. It plays a vital role in understanding life processes and solving real-world problems in health, agriculture and environmental management. According to Reece et al. (2011), Biology is a science deeply rooted in observation and experimentation, making practical work an essential component of its teaching and learning process. In secondary education, Biology serves as one of the core science subjects designed to develop learners' scientific literacy, critical thinking skills and ability to apply scientific knowledge to everyday life (Reece et al., 2011).
Practical work in science education refers to learning activities that involve direct manipulation of materials, observation of phenomena and collection of empirical data to support scientific understanding. Millar (2010) stated that practical work is not merely about doing experiments but about enabling learners to link theoretical ideas with observable evidence. In the context of Biology education, practical work includes activities such as microscopy, dissection, field studies, experimentation on physiological processes and ecological investigations.
According to Hofstein and Lunetta (2004), laboratory experiences are central to science learning because they provide learners with opportunities to develop inquiry skills, understand scientific concepts and engage in authentic scientific processes. They asserted that when students participate actively in practical work, they are more likely to retain knowledge and develop a deeper understanding of scientific principles. In contrast, when science instruction is limited to theoretical teaching, learners often struggle to connect concepts with real-life situations, leading to superficial understanding and poor academic performance.
In many educational systems, Biology is included in the curriculum as a practical-oriented subject. According to the National Policy on Education in several countries, science subjects are expected to be taught using both theoretical and practical approaches to enhance learners' comprehension and skill development. However, the implementation of practical work in many secondary schools remains inconsistent. Abrahams and Millar (2008) reported that although teachers recognize the importance of practical work, it is often underutilized due to constraints such as lack of equipment, inadequate laboratory space, limited instructional time and insufficient teacher training. They contended that when practical work is poorly implemented, it fails to achieve its intended educational outcomes.
In many secondary schools, especially in developing educational contexts, practical work is either infrequently conducted or conducted in a demonstration-based manner where students have limited hands-on participation. According to UNESCO (2015), inadequate investment in science laboratory infrastructure continues to hinder effective science teaching in many schools, thereby affecting students' achievement in science subjects, including Biology (UNESCO, 2015). On the other hand, where practical work is effectively integrated into Biology teaching, students tend to show improved understanding of concepts, increased motivation and better academic performance.
This study is set against the backdrop of the need to investigate how practical work influences the teaching and learning of selected Biology concepts in secondary schools, with a view to improving instructional practices and student learning outcomes.
1.3 Statement of Problems
Investigation revealed that biology as a science subject relies heavily on observation, experimentation and hands-on engagement for meaningful understanding of abstract and complex concepts. However, in many secondary schools, the teaching and learning of Biology is still largely dominated by theoretical instruction, with limited integration of practical work (Hofstein & Lunetta, 2004). On the other hand, where practical activities are effectively integrated into teaching, learners demonstrate improved conceptual understanding and stronger engagement with Biology content.
Furthermore, practical sessions are either irregular, poorly organized or completely absent due to factors such as inadequate laboratory facilities, insufficient instructional materials, large class sizes and limited teacher preparedness. It is against this backdrop that this study seeks to examine the impact of practical work on the teaching and learning of selected Biology concepts in secondary schools.
1.4 Aim and Objectives of Study
The aim of this study was to investigate the impact of practical work on the teaching and learning of some Biology concepts in selected secondary schools.
The specific objectives of the study were to:
- Examine the extent to which practical work was used in teaching Biology concepts in secondary schools.
- Determine the availability of laboratory facilities for Biology practical work.
- Assess the effect of practical work on students' understanding of Biology concepts.
- Investigate the challenges affecting effective implementation of practical work in Biology teaching.
- Evaluate the relationship between practical work and students' academic performance in Biology.
1.5 Research Questions
Based on the stated objectives, the following research questions were raised:
- To what extent was practical work used in teaching Biology concepts in secondary schools?
- How available were laboratory facilities for Biology practical work in secondary schools?
- What effect did practical work have on students' understanding of Biology concepts?
- What challenges affected the effective implementation of practical work in Biology teaching?
- What relationship existed between practical work and students' academic performance in Biology?
1.6 Research Hypotheses
In order to pursue the objective of this study, the following generalized statements have been designed to guide and aids in obtaining the result for the experiment to be conducted. For this work, the null hypothesis will be represented with H0 while the alternative hypothesis will be represented with hypothesis H1.
Hypothesis One
- H0: There was no significant relationship between practical work and students' understanding of Biology concepts in secondary schools
- H1: There was a significant relationship between practical work and students' understanding of Biology concepts in secondary schools
Hypothesis Two
- H0: There was no significant relationship between availability of laboratory facilities and effective teaching of Biology practical work
- H1: There was a significant relationship between availability of laboratory facilities and effective teaching of Biology practical work
Hypothesis Three
- H0: There was no significant relationship between practical work and students' academic performance in Biology
- H1: There was a significant relationship between practical work and students' academic performance in Biology
1.7 Significance of Study
At the completion of the study, Biology teachers will improve their instructional methods by integrating practical work into lesson delivery. Also, school administrators will enhance laboratory provision and maintenance for effective science teaching.
Furthermore, curriculum planners will strengthen the inclusion of practical activities in Biology curriculum content. In addition, students will develop better understanding of Biology concepts through improved exposure to practical learning.
Lastly, education policymakers will make informed decisions on science education development in secondary schools.
1.8 Scope and Limitations of the Study
The scope of the research is focused on selected secondary schools in Lagos State, Nigeria. The research examined the impact of practical work on the teaching and learning of Biology concepts such as cell structure, respiration and ecological relationships among senior secondary school students.
The study data collection was limited by inadequate access to some schools and restricted availability of respondents which was affected by school schedules and administrative procedures.
1.9 Definition of Terms
Biology:
Biology was defined as the scientific study of living organisms and their interactions with the environment (Reece et al., 2011). It involves understanding life processes through observation, experimentation and analysis.
Practical work:
Practical work was defined as learning activities in which students actively engage in experiments, observation and manipulation of materials to develop scientific understanding (Millar, 2010). It helps learners connect theory with real-world scientific processes.
Teaching:
Teaching was defined as the systematic process of facilitating learning through instruction, guidance and demonstration by the teacher in an educational setting.
Learning:
Learning was defined as a relatively permanent change in behavior or understanding resulting from experience, study or instruction (Gagne, 1985).
Concepts:
Concepts were defined as fundamental ideas or principles that form the basis of understanding in a subject area such as Biology.
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