African township schools are characterised by cultural and linguistic diversity, hence, teachers have the dual task of ensuring that learners grasp scientific concepts, while also catering for the diversity in the learners’ backgrounds. The study reported on here was aimed at investigating teachers’ beliefs and practices in teaching life sciences using English, a language that is not their own home language. The study was underpinned by a socio-constructivist perspective, emphasising how one’s personal context, including prior experiences, influences the development of beliefs about language use in life sciences classes and the manner in which teaching and learning might occur. The sample comprised 6 teachers who all spoke English as a second language. We collected the data using structured interviews to ascertain the teachers’ beliefs about the teaching of life sciences in English to Grade 11 classes, and classroom observations to identify their classroom practices. The findings indicate that the beliefs that the teachers expressed differed from their actual choices and practices in the lessons observed.
Language plays a pivotal role in science teaching and learning as it serves as both the medium through which the teachers and learners think and also communicate in the classrooms. Science and Life sciences in particular comprises of a unique scientific language register with a lot of technical words and terms borrowed from other languages other than English. Previous researchers acknowledged the difficulty teachers face when teaching science in a language different from their own and that of the learners. Consequently, the current study explored the various ways in which English-second-language Life Sciences teachers taught Life Sciences in order to mitigate language difficulties for themselves and those of their learners. The study was guided by the research question: how does English as a second language influence teacher practices when teaching Life Sciences to grade 12 learners? Using a qualitative research design, six Life Sciences teachers with various levels of teaching experience, two novices, two relatively experienced and two very experienced teachers, were purposefully selected from six different schools. The assumption was that teachers at various levels of experience may have different experiences of teaching the subject in a second language. Each teacher was observed once whilst teaching the same topic to grade 11 Life Sciences learners to establish their teaching practices. Incidences of learner engagement with the content, teacher-learner and learner-learner interactions were captured and scored using the Reformed Teaching Observation Protocol rubric. Lesson observations were suitable for data collection as they allowed the researcher to examine even non-elicited behaviour as it happened. The findings indicated that language difficulties were prevalent and affected both teachers and learners in engaging with the concepts at hand. For instance, most of the teachers whether experienced or not, struggled to explain and elaborate vital Life Sciences concepts in a comprehensible manner due to lack of proficiency in the language of instruction. The teachers mostly utilised code-switching as it enabled them to explain and elaborate scientific terms and processes in both English and their home languages. Because learners were allowed to express themselves in their home languages, the level of interaction also increased. In addition, teachers used transliteration and demonstrations as teaching strategies that also reduced the challenges of using English as a medium of instruction. The study informs both pre-service and in-service teacher development programmes.
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