Development of Scientific Reasoning in College Biology: Do Two Levels of General Hypothesis‐Testing Skills Exist?

The primary purpose of the present study was to test the hypothesis that two general developmentally based levels of hypothesis‐testing skills exist. The first hypothesized level presumably involves skills associated with testing hypotheses about observable causal agents; the second presumably involves skills associated with testing hypotheses involving unobservable entities. To test this hypothesis, a hypothesis‐testing skills test was developed and administered to a large sample of college students both at the start and at the end of a biology course in which several hypotheses at each level were generated and tested. The predicted positive relationship between level of hypothesis‐testing skill and performance on a transfer problem involving the test of a hypothesis involving unobservable entities was found. The predicted positive relationship between level of hypothesis‐testing skill and course performance was also found. Both theoretical and practical implications of the findings are discussed. © 2000 John Wiley & Sons, Inc. J Res Sci Teach 37: 81–101, 2000     

The Structure of Scientific Arguments by Secondary Science Teachers: Comparison of experimental and historical science topics

Just as scientific knowledge is constructed using distinct modes of inquiry (e.g. experimental or historical), arguments constructed during science instruction may vary depending on the mode of inquiry underlying the topic. The purpose of this study was to examine whether and how secondary science teachers construct scientific arguments during instruction differently for topics that rely on experimental or historical modes of inquiry. Four experienced high-school science teachers were observed daily during instructional units for both experimental and historical science topics. The main data sources include classroom observations and teacher interviews. The arguments were analyzed using Toulmin's argumentation pattern revealing specific patterns of arguments in teaching topics relying on these 2 modes of scientific inquiry. The teachers presented arguments to their students that were rather simple in structure but relatively authentic to the 2 different modes. The teachers used far more evidence in teaching topics based on historical inquiry than topics based on experimental inquiry. However, the differences were implicit in their teaching. Furthermore, their arguments did not portray the dynamic nature of science. Very few rebuttals or qualifiers were provided as the teachers were presenting their claims as if the data led straightforward to the claim. Implications for classroom practice and research are discussed.     

How biology teachers can respond to Intelligent Design

Teachers of biology and related subjects are increasingly meeting objections from students and their parents to the teaching of evolution and the exclusion of what is called the theory of Intelligent Design. This paper attempts to draw together arguments and evidence which may be used by such teachers. Four lessons are drawn from the 1982 judgement against Creation Science in Arkansas for those opposing attempts to introduce the theory of Intelligent Design into school science programs: that a wide definition of science is the most useful; that religion is not the enemy; that science teachers should trust their own expertise; and that alternative theories should not be excluded.     

有效促进学生能力发展的小学科学教学方式实验设计

不同教学方式对增进知识和提升能力有不同的作用。本实验的假设是在主体间师生关系中,通过教师有效选择和整合主题讲授、问题发现和主题问题建构等三种教学方式,有效增进学生的科学知识和提升学生的科学能力,目的是通过有效的科学知识教学促进学生科学能力的发展,使科学知识教学和科学能力发展相互促进。     

A Conceptual Analysis of Evolutionary Theory for Teacher Education

In this paper we present a schematic overview of the central concepts in evolutionary theory, setting them off against the background of widespread misconceptions about them. Our aim is to provide high school teachers with (1) an overview of those particular concepts that they can expect students to have difficulties with, (2) a comparison of students’ alternative conceptions with the corresponding accepted scientific concepts and (3) some recommendations for teaching these concepts. We aim to improve the learning and teaching of evolution by making the relevant conceptual debates within the fields of history and philosophy of science more accessible to science teachers. We intended this conceptual analysis to be of use as a teaching tool for in-service teachers, as well as biology teachers in training.     

Assessing and Enhancing Pre-service Science Teachers’ Self-Efficacy to Teach Science Through Argumentation: Challenges and Possible Solutions

The purpose of this study was to explore the impact of an intervention on pre-service science teachers’ self-efficacy to teach science through argumentation and explore the challenges they experienced while implementing argumentation. Forty pre-service science teachers in their final semester of schooling participated in an intervention that lasted for 11 weeks. Intervention focused on participants’ understanding of argumentation as a scientific practice and as a pedagogical tool. The participants engaged in argument construction, evaluation, and critique, taught three argumentation lessons, engaged in peer observation of teaching, and reflection on their teaching skills. Data were collected through Argumentation Self-Efficacy Scale and an open-ended questionnaire. The results show that the intervention had a significantly positive effect on pre-service teachers’ self-efficacy. Despite this reported self-efficacy, participants experienced significant challenges in guiding their students to construct scientific arguments and assessing the arguments developed by their students. Discussion focuses on implications for professional development of pre-service and in-service science teachers.     

A study of teacher cognition in planning elementary science lessons

Advances in cognitive psychology and in research techniques have led to an increase in the acceptance of the conception of teaching as a “thoughtful” profession. The interest and enthusiasm of researches in aspects of teacher cognition demonstrate a shift from an emphasis on observable teacher behaviours to a focus on a teacher's unobservable thinking process. In this study, a qualitative approach was used to uncover a teacher's thinking process during lesson planning, to depict a more holistic view of the structural complexity of teacher cognition during lesson planning. Specialised science teachers and general teachers who had different levels of subject expertise were studied. The teachers were interviewed on how they planned an elementary science lesson. Interview protocols were analysed using a taxonomy which assessed the cognitive complexity of teacher thinking. Differences were found between specialised science teachers and general teachers in the levels of structural complexity in their thinking process.     

The implementation of equitable teaching strategies by high school biology student teachers

Teachers can perpetuate stereotypic cultural beliefs regarding girls' ability in, aptitude for, and suitability for science by their teaching practices and behaviors. As teachers have a major influence on girls' career choices their equitable teaching practices in the classroom are important to encourage all students, but especially girls, to continue with science. Researchers have studied science classrooms and have defined common strategies and practices that can help create an equitable classroom environment. The purpose of this study was to determine if high school biology student teachers could transfer learned equitable teaching strategies to actual teaching and the support conditions necessary for that transfer. Two support conditions were assessed: cooperating teacher and peer group support. Seven preservice teachers were placed into three groups. One group had both support conditions, the second group had only one condition (peer support), and the third group did not have either support condition. Both qualitative and quantitative data sources were collected. Results showed that preservice teachers could transfer learned equitable teaching into actual teaching practice. However, they were more successful in achieving the transfer if they were supervised by cooperating teachers who are sensitized to the issue of gender equity in education. Being involved in a peer support group was not as crucial to using the strategies as having a supportive cooperative teacher.     

Challenge in learning and teaching science

Taking as a basis a conceptualisation of personal challenge having both cognitive/metacognitive (thinking) and affective (feeling) components, the nature and extent of perceived challenge in learning and teaching science were explored for seven teachers and thirty-seven students in five secondary schools over a period of five months. Findings suggest that many secondary students are not challenged by the science they learn in school. Similary, many secondary science teachers are insufficiently challenged by the task of teaching. There are indications, however, that science teaching and learning attitudes and practices can be improved if teachers work to diagnose and change key classroom factors that influence level of perceived challenge in learning.     

A Study of Student Disciplinarian Practices in Two Georgia High Schools

Abstract

In thin study pupil control Ideology was conceptualized along: a continuum ranging from “custodialism” at one “extreme to “humanism” at the other. Hypotheses were deduced from a conceptual framework which emphasized the saliency of client control in organizations with unselected clients. Data for student teachers (N = 282) were collected from students who completed their student teaching experience during the 1065-06 school year at Oklahoma State University; the instruments were administered and completed in group meetings both before and after student teaching. It was hypothesized that student teachers would be significantly more custodial in their pupil control Ideology after the student teaching experience than before; separate tests of the hypothesis were made at both the elementary and secondary levels. Ail hypotheses tested were confirmed at a level of significance beyond the .001 level.     

Connecting Science and Mathematics: The Nature of Proof and Disproof in Science and Mathematics

Disagreements exist among textbook authors, curriculum developers, and even among science and mathematics educators/researchers regarding the meanings and roles of several key nature-of-science (NOS) and nature-of-mathematics (NOM) terms such as proof, disproof, hypotheses, predictions, theories, laws, conjectures, axioms, theorems, and postulates. To assess the extent to which these disagreements may exist among high school science and mathematics teachers, a 14-item survey of the meanings and roles of the above terms was constructed and administered to a sample of science and mathematics teachers. As expected, the science teachers performed better than the mathematics teachers on the NOS items (44.1 versus 24.7%, respectively) and the mathematics teachers performed better than the science teachers on the NOM items (59.0 versus 26.1%, respectively). Nevertheless, responses indicated considerable disagreement and/or lack of understanding among both groups of teachers concerning the meanings/roles of proof and disproof and several other key terms. Therefore it appears that these teachers are poorly equipped to help students gain understanding of these key terms. Classroom use of the If/and/then/Therefore pattern of argumentation, which is employed in this paper to explicate the hypothesis/conjecture testing process, might be a first step toward rectifying this situation.     

The Contribution of Ethnobiology to the Construction of a Dialogue Between Ways of Knowing: A Case Study in a Brazilian Public High School

This paper reports results obtained in pedagogical interventions in a Brazilian public high school which aimed at promoting a dialogue between scientific and traditional knowledge in the context of biology teaching. The interventions were based on the use of a didactic material and teaching sequence elaborated on the grounds of school knowledge about botany, as presented in biology textbooks, and interviews with students who were also farmers, so as to gather data about their ethnobiological knowledge. Our goal was to develop and test resources that can offer support for teachers who wish to build a dialogue between different ways of knowing in multicultural settings. Our results indicate that the use of the didactic material and teaching sequence indeed created possibilities for a dialogue between the students’ ethnobiological knowledge and biology school knowledge. We observed some shortcomings in classroom practice, partly reflecting our very choice of subject matter to develop the teaching sequence. But the interventions also revealed important limitations that we regard as representative of problems that may generally make multicultural science teaching a hard goal to achieve. It was clear that important shortcomings were related to teachers’ difficulties to conduct a dialogue between ways of knowing in a science classroom, and, thus, called attention to the importance of introducing a multicultural dimension into teacher education. We also observed that the fact that students did not show much sensitivity towards dealing with cultural diversity was a factor constraining the success of the interventions. These results highlight the importance of proposing and testing teacher education initiatives aiming at preparing them to teach science in a culturally sensitive manner, and also managing classroom tensions and conflicts so as to make it possible an effective dialogue between different ways of knowing in a multicultural setting.     

The acquisition of formal operational schemata during adolescence: The role of the biconditional

To test the hypothesis that the basic “logic” utilized by individuals in scientific hypothesis testing is the biconditional (if and only if), and that the biconditional is a precondition for the development of formal operations, a sample of 387 students in grades eight, ten, twelve, and college were administered eight reasoning items. Five of the items involved the formal operational schemata of probability, proportions and correlations. Two of the items involved propositions and correlations. Two of the items involved propositional logic. One item involved the biconditional. Percentages of correct responses on most of the items increased with age. A principal-component analysis revealed three factors, two of which were identified as involving operational thought, one of which involved propositional logic. As predicted, the biconditional reasoning item loaded on one of the operational thought factors. A Guttman scale analysis of the items failed to reveal a unidimensional scale, yet the biconditional reasoning item ordered first supporting the hypothesis that it is a precondition for formal operational reasoning. Implications for teaching science students how to test hypotheses are discussed.     

A case study of two exemplary biology teachers

Research has indicated that most science classrooms are not intellectually demanding and place little emphasis on small group discussions and laboratory activities. However, successful science programs and competent science teaching that can provide models for other science teachers do exist. This study sought to document the teaching practices of two exemplary biology teachers of grades 11 and 12 by means of an interpretive research methodology. Both teachers had a thorough and comprehensive knowledge of the content they were to teach and had a range of teaching strategies that could be used without a great deal of thought. Their expectations for student performance were high, consistent, and firm. Students were expected to complete a high level of academic work in discussions, in problem work, and in laboratory activities, and were encouraged to take responsibility for their own learning. A distinctive feature of these biology classes was the high level of managerial efficiency, where lessons were busy occasions for both teacher and students; students had little opportunity for off-task behavior. Both teachers actively monitored the behavior of both high- and low-ability students by moving around the room and speaking with individuals, while still maintaining control of the entire class. By manipulating questioning and the social environment, both teachers encouraged students to engage in work, gave effective praise to the whole class and to individuals, encouraged student input by referring to it, helped students to effectively use their time, and gave marks for completion of set work. Compared to research with less-successful teachers, these teaching behaviors contributed to exemplary practice.     

Experienced teachers' knowledge of teaching and learning of models and modelling in science education

This article reports a study of the knowledge of experienced science teachers in the context of a reform in science education in The Netherlands. The study focused on a major goal of the reform, that is, improving students' knowledge and abilities in the field of models and modelling in science. First, seven teachers of biology and chemistry were interviewed about the teaching and learning of models and modelling in science. Next, a questionnaire was designed consisting of 30 items on a Likert-type scale. This questionnaire was completed by a group ( n = 74) of teachers of biology, chemistry and physics. Results indicated that the teachers could be grouped in two subgroups, who differed in terms of their self-reported use of teaching activities focusing on models: one sub-group applied such activities substantially more often than the other sub-group. This distinction appeared not to be related to the teachers' subject, or teaching experience. Moreover, the use of teaching activities seemed only loosely related to the teachers' knowledge of their students, particularly, students' views of models and modelling abilities. Implications for the design of teacher education are discussed.     

Promoting preservice chemistry teachers' understanding about the nature of science through history

The purpose of this quasi‐experimental study was to document the benefits of teaching chemistry through history. The experimental group consisted of seniors enrolled in a teacher preparation program in which they learned how to teach chemistry through the history of science. Their understanding of the nature of science was compared with that of a control group, which consisted of juniors in the same department. The results of the analysis of covariance revealed that the experimental group outperformed the control group on an instrument documenting respondents' understanding of the nature of science. Additional frequency analysis and interview data indicated that the experimental group students had a better understanding of the nature of creativity, the theory‐based nature of scientific observations, and the functions of theories. In the pretreatment interviews, students in the experimental group based their explanations concerning the nature of science primarily on their intuition. In the posttreatment interview, however, they were able to explain their beliefs by using scientists' arguments or hypotheses as examples. This result indicates that the experimental group's understanding about the nature of science was enhanced by learning to teach through the history of science. © 2002 Wiley Periodicals, Inc. J Res Sci Teach 39: 773–792, 2002     

原有陈述性知识和溯因推理对小学生科学假设形成的影响

为了探讨原有陈述性知识和溯因推理能力在学生科学假设形成中的作用,用单摆作为研究工具对49名小学六年级的学生进行测试。结果发现,学生不能利用已有陈述性知识提出相应的科学假设。即使用探究方式对学生进行单摆运动原理的教学,学生具备摆长影响单摆运动周期的陈述性知识,部分学生仍不能提出摆长影响单摆运动速度的科学假设。研究表明,科学假设的形成是陈述性知识和溯因推理能力共同作用的结果。为培养学生的科学假设能力,教师应循序渐进地训练学生的溯因推理技能。     

A cross-cultural comparison of biology lessons between China and Germany: a video study

Given the globalization of science education and the different cultures between China and Germany, we tried to compare and explain the differences on teacher questions and real life instances in biology lessons between the two countries from a culture-related perspective. 22 biology teachers from China and 21 biology teachers from Germany participated in this study. Each teacher was videotaped for one lesson on the unit blood and circulatory system. Before the teaching unit, students’ prior knowledge was tested with a pretest. After the teaching unit, students’ content knowledge was tested with a posttest. The aim of the knowledge tests here was for the better selection of the four samples for qualitative comparison in the two countries. The quantitative analysis showed that more lower-order teacher questions and more real life instances that were introduced after learning relevant concepts were in Chinese lessons than in German lessons. There were no significant differences in the frequency of higher-order questions or real life instances that were introduced before learning concepts. Qualitative analysis showed that both German teachers guided students to analyze the reasoning process of Landsteiner experiment, but nor Chinese teachers did that. The findings reflected the subtle influence of culture on classroom teaching. Relatively, Chinese biology teachers focused more on learning content and the application of the content in real life; German biology teachers emphasized more on invoking students’ reasoning and divergent thinking.     

On Developing Content‐oriented Theories Taking Biological Evolution as an Example

Both in Europe and the United States there is a growing interest in design research. One example is the design and validation of topic‐oriented teaching–learning sequences. This research may be said to have two objectives. One is to design and test “useful products”, such as teachers’ guides and study material for students, which may be put into practice in various ways. The second is to contribute to the development of educational science; for example, understanding conditions for learning of given topics under regular classroom conditions. This article concerns the latter objective and deals with the development of content‐oriented theories stating conditions that promote learning with long‐term understanding of given topics. We present one such theory, concerning evolution by natural selection, and describe the arguments and evidence that underlie the theory, which we regard as a well‐founded hypothesis. Some methodological problems associated with testing this type of theory are discussed, as well as the role of content‐oriented theories in strengthening science education research as an autonomous specialization within educational science.