Plant nutrition and photosynthesis is one of the most difficult issues teachers are confronted with in science classes. This can be due to alternative conceptions students’ hold, which are often profoundly contrary to their scientific counterparts. Consequently, fruitful learning environments should build on learners’ alternative conceptions to initiate conceptual change towards a more scientific understanding. In this qualitative case study, high-school students’ pre-instructional conceptions about plant nutrition were identified empirically. Afterwards these students were exposed to the van-Helmont experiment in order to create a cognitive conflict. The learning processes and signs of conceptual change were identified using Qualitative Content Analysis. The results show that the van-Helmont experiment does not trigger conceptual change but reinforces students’ pre-instructional conceptions. Ultimately, a cognitive-linguistic analysis using Conceptual Metaphor Theory was conducted. Interestingly, underlying embodied conceptions and image schemas about human nutrition became evident. These thinking patterns were used metaphorically and, therefore, can be seen as the basis to understand plant nutrition. As a result, we propose a reverse approach of teaching photosynthesis and nutrition. Our Dissimilation-Before-Assimilation approach takes learners’ alternative conceptions and underlying image schemas into account in order to promote a fruitful learning of the concepts of plant nutrition.

The analysis of students’ conceptions is a crucial element in modern science education research. Based on a large number of studies, we know that learning environments should build upon students’ existing knowledge to initiate conceptual change towards an adequate scientific understanding. This also holds true when it comes to moral reasoning. In this case, the implementation of educational standards, such as decision-making competence, strongly relies on students’ conceptions about ethical issues. In this study the Conceptual Metaphor Theory is used empirically in order to analyse students’ language in regard to conceptual metaphors. To date, little educational research exists on the effects of moral metaphors in science education. For this reason, we conducted a two-part qualitative interview study (n = 9 + 6 and 6) in order to identify German high-school students’ moral conceptions about animal ethics. The conceptions were identified and analysed by means of qualitative content analysis. A key finding can be seen in the underlying embodied conceptions and image schemas that are in particular linked to human well-being. Apparently, students use these metaphorical thinking patterns and are therefore capable of conceiving abstract conceptions about animal ethics. As a consequence, we propose an alternative approach in order to foster decision-making competence.

By means of their pivotal role in the outbreak of a variety of diseases, such as, recently, COVID-19, the molecular aspects of cell membrane function have gained considerable attention from researchers in recent decades. The resulting information explosion and the growing interdisciplinary character of cell biology seems, however, to not be represented in science classrooms. Hence, there appears to be a gap between what is scientifically known and what is actually taught in classrooms. Framed by the model of educational reconstruction (MER), the aim of our study is therefore to identify scientific core ideas of cell membrane biology from an educational point of view. This is achieved by conducting qualitative content analysis of relevant cell biology literature. By using Conceptual Metaphor as a theory of understanding, we additionally illuminate the experiential grounding of scientific conceptions. Our results propose that cell membrane biology can be structured into three core ideas, comprising compartmentalisation, physical and chemical properties, and multicellular coordination interrelated by evolution as a key aspect. Our results show that scientists conceive these ideas metaphorically. Embodied part-whole relations seem, for example, to lay the grounds for their understanding of biological function. The outcomes of the study may inform future cell membrane teaching.

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