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Connecting photosynthesis and cellular respiration: Preservice teachers' conceptions
Authors:Mary H. Brown  Reneè S. Schwartz
Affiliation:1. 5400 ‐ Science Department, Lansing Community College, P.O. Box 40010, Lansing, Michigan 48901‐7210;2. Department of Biological Sciences, Mallinson Institute for Science Education, Western Michigan University, Kalamazoo, Michigan
Abstract:The biological processes of photosynthesis and plant cellular respiration include multiple biochemical steps, occur simultaneously within plant cells, and share common molecular components. Yet, learners often compartmentalize functions and specialization of cell organelles relevant to these two processes, without considering the interconnections as well as the significance of the plant as an independent biological system functioning as a nested component within local and global ecosystems. Understanding connections among biological systems at macro and micro levels is important to biological literacy. This study examined preservice elementary teachers' conceptions of photosynthesis and plant cellular respiration, with attention to interconnections and systems. Participants were limited in their understanding of the processes impacting multiple ecological levels, and they held inadequate representations of interconnections between the processes. Participants' views were laden with sociological and egocentric components. They often compared plant functions with analogous human functions. Most participants viewed plants as dependent on humans while having societal use. Justifications for views included nominal knowledge of the processes; experiential authoritarian reasoning; and anthropomorphism. We discuss instructional implications in light of the findings. © 2009 Wiley Periodicals, Inc. J Res Sci Teach 46: 791–812, 2009
Keywords:undergraduate  biology conceptions  systems  preservice teachers  photosynthesis  cellular respiration
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