ABSTRACT EFFECTS OF 7E LEARNING CYCLE MODEL ACCOMPANIED WITH COMPUTER ANIMATIONS ON UNDERSTANDING OF DIFFUSION AND OSMOSIS CONCEPTS B&uuml / lb&uuml / l, Yeter Ph. D., Department of Secondary Science and Mathematics Education Supervisor: Prof. Dr. &Ouml / mer Geban August 2010, 232 pages The main purpose of the study was to compare the effectiveness of the instruction based on 7E learning cycle model accompanied with computer animations and traditionally designed biology instruction on 9th grade students&rsquo / understanding and achievement related to diffusion and osmosis concepts and their attitudes toward biology as a school subject. Quasi experimental design was used in this study. A total number of 66 ninth grade students from four intact classes of a biology course taught by the same biology teacher in a private high school in Istanbul were enrolled. The study was conducted during spring semester of 2008-2009 academic year. This study included two experimental and two control groups. Experimental and control groups were randomly assigned. The students in the control group were instructed with traditionally designed biology instruction, while the students in the experimental group were instructed with 7E learning cycle model based instruction accompanied with computer animations. In the experimental group, students were taught with respect to the sequence of 7E learning cycle model which are elicit, engage, explore, explain, elaborate, evaluate, and extend through the use of activities such as demonstration, computer animations, laboratory activities, and discussions. In the control group, traditionally designed biology instruction was implemented through the teacher explanation, demonstrations, and use of textbook. Diffusion and Osmosis Diagnostic Test (DODT), Diffusion and Osmosis Achievement Test (DOACH), Attitude Scale Toward Biology (ASTB) were administered to both groups as a pre-test and post-test to assess students&rsquo / understanding and achievement of diffusion and osmosis concepts, and students&rsquo / attitudes toward biology respectively. Science Process Skill Test (SPST) was given at the beginning of the study to determine students&rsquo / science process skills. Moreover classroom observations were conducted. The hypotheses were tested by using analysis of covariance (ANCOVA) and two-way analysis of variance (ANOVA). The results indicated that instruction based on 7E learning cycle model accompanied with computer animations caused significantly better acquisition of the scientific conceptions related to diffusion and osmosis concepts than traditionally designed biology instruction. Science process skill was determined as a strong predictor in the concepts related to diffusion and osmosis. Moreover instruction based on 7E learning cycle model accompanied with computer animations was more effective for improvement of students&rsquo / attitudes as a school subject. However no significant effect of gender difference on students&rsquo / understanding, achievement, and attitudes toward biology as a school subject was found.

The purpose of the present study was to compare the effectiveness of context based instruction over traditionally designed chemistry instruction on 9th grade students&rsquo / understanding of cleaning materials topic and their attitudes toward environment. Moreover students&rsquo / science process skills were measured for using as a covariate. Participants were 222 ninth grade students from eight classes in two different types of high schools in Ankara. Experimental group students were instructed with context based instruction and control group students were instructed with traditionally designed instruction through five weeks. Cleaning Materials Achievement Test and Attitudes toward Environment Scale were used as pre and post tests. Science Process Skills test was used only as a pretest. MANCOVA technique was used as a statistical analysis procedure. According to statistical analyses, there was a significant mean difference with respect to context based instruction and traditionally designed instruction on cleaning materials topic in favor of experimental group and no significant difference with respect to attitude toward environment. There was no significant mean difference with respect to school type in both Cleaning Materials Achievement Test scores and Attitude toward Environment Scale scores. Beside, science process skills were a strong predictor for understanding the cleaning materials topic. Four focus groups were conducted separately regarding the students&rsquo / career choices after the treatment to have an idea over the quality of the instruction in experimental group. Focus group results revealed that students were appreciated and more motivated with context based instructional design.

The main purpose of this study was to compare the effectiveness of conceptual change oriented instruction accompanied with cooperative group work and traditionally designed instruction for removing misconceptions related to acid-base concepts. In this study 33 tenth grade students from two classes from METU Development Foundation Private School in the spring semester of 2003-2004 participated. There were two groups in the study. Students in experimental group received conceptual change oriented instruction with cooperative group work, and students in control group received traditionally designed instruction over a period of six weeks. Acid-Base Concept Test was administered to both groups as pre- and post-test. Students were also received Science Process Skill Test to determine their science process skills as pre-test and Attitude Scale Toward Chemistry to measure their attitudes toward chemistry as pre- and post-test. The hypotheses were tested by t-test, ANCOVA, and ANOVA. The results showed that the students in experimental group had significantly higher scores with respect to achievement related to acid-base concepts than the students in control group. On the other hand, there was no significant difference between attitude mean scores of students in experimental and control groups. Also, science process skill was a strong predictor for the achievement related to acid-base concepts. Alternatively, there was no significant difference between girls and boys in terms of understanding of acid-base concepts and attitudes toward chemistry. Alternatively, there was no significant interaction between gender and treatment on understanding of acid-base concepts and attitudes toward chemistry.

The main purpose of the study was to compare the effectiveness of the conceptual change oriented instruction through demonstration and traditionally designed chemistry instruction on 10th grade students&rsquo / understanding of chemical reactions and energy concepts and attitudes towards chemistry as a school subject. In this study, 61 tenth grade students from two classes of chemistry course instructed by same teacher from Atat&uuml / rk Anatolian High School took part. The study was conducted during 2003-2004 fall semester. This study included two groups which were selected randomly throughout 9 classes. One of the group was defined as control group in which students were taught by traditionally designed chemistry instruction, while the other group defined as experimental group in which students were instructed by conceptual change oriented instruction through demonstrations (CCID). Chemical Reactions and Energy Concepts Test and Attitude Scale toward Chemistry were administered to both groups as a pre-test and post-test to assess the students understanding of chemical reactions and energy concepts and students&rsquo / attitudes toward chemistry, respectively. Science Process Skills Test was given at the beginning of the study to determine students&rsquo / science process skills. The hypotheses were tested by using analysis of covariance (ANCOVA) and two-way analysis of variance (ANOVA). The results showed that CCID caused significantly better acquisition of the scientific conceptions related to chemical reactions and energy concepts than TDCI. The results showed that there was a significant difference between post-test mean scores of students taught with CCID and those taught with TDCI with respect to their attitude toward chemistry as a school subject. A Science process skill was determined as a strong predictor in understanding the concepts related chemical reactions and energy.

The purpose of this study was to evaluate the undergraduate biology practical instructions and the level of competence of undergraduate biology students in practical laboratory skills in some Ethiopian universities using skill performance rubric and questionnaires. A sample of 208 third year students and 26 instructors and laboratory assistants from three universities were selected as sample of the study. Students reported that more than 84.2% of the laboratory activities are below the average number of laboratory activities recommended by the curriculum with no significant difference between universities. The laboratory skill performance test score was below the midpoint. None of the students could be able to estimate and determine fields of vision of a microscope. There is a significant and a positively linear relationship between the students’ grade point average (GPA) with identification of laboratory equipment, handling of microscope, setting of microscope, estimation of diameter of field of vision and measuring liquid. Laboratory skill performance test score is correlated with higher education entrance exam score but not with students’ high school laboratory back ground. There is no significant difference in instructor’s manipulative skills among universities (p ≥ 0.09) and instructors manipulative skills is neither correlated with qualification nor teaching experience (P≥0.056). The most common method of assessment instructors’ use in the laboratory is laboratory report and identification of specimen examination (46.4%) and written exam and identification of specimen examination (35.7%). The number of courses having laboratory manuals is as low as 14.3%, in the new university. Manipulating materials, measuring and using numbers, and pre lab activity were common activities, and were found in every manual and in every university. Moreover, the result also revealed that the manuals contain high percentage rate of basic science process skills (75.4%) as compared to the integrated science process skills (24.6%). Correlation and multiple regression analyses revealed that students’ laboratory performance skills is significantly positively correlated with higher education entrance exam score, availability of laboratory resources and instructors experiences. Instructors’ experience has significant positive regression weights. / Life and Consumer Sciences / D. Phil. (Mathematics, Science and Technology Education)

Science is taught at all grade levels, yet there exists a deficiency in the amount of emphasis placed on science training for elementary teachers. As a result, teachers often feel inadequate in their knowledge of scientific areas and in their ability to develop science process skills in their students. As a result in this lack of training, a need exists to provide programs to increase skill and confidence of elementary teachers not only in teaching science concepts but science process skills as well. One means of meeting this need was the development of an activity-based, process-oriented inservice curriculum designed specifically for elementary science. The curriculum was designed as an inservice component of 60 hours that emphasized process skills as well as updating science concepts. The curriculum was designed for use in grades 1-6 and stressed "hands-on" experiences using readily available materials and a minimum of specialized equipment. The curriculum was field tested as a component of the Clay county, Florida Summer Inservice Institute. Thirty eight teachers, whose teaching assignments ranged from kindergarten to sixth grade, participated in the field test. At the beginning of the Institute, no participant scored 80% or better on a pretest of knowledge of concepts and process skills. Each participant completed each 'activity in the role of a student, including forming a hypothesis, collecting data, and drawing a conclusion. Activities were then discussed stressing process skills used and an indepth review of concepts involved. On the final day of the Institute, 84% of the participants scored 80% or better on the posttest. Furthermore, evaluations of the component by particiPants indicated a marked improvement in confidence in and enthusiasm for teaching science process skills. Overall the curriculum met the objective of increasing elementary teachers' ability and willingness to teach science process skills as well as science concepts.

The major purpose of this study was to investigate the effects of using animal organ dissection in general, and its use specifically in problem-solving as a teaching strategy in Grade 11 Life Sciences education. A multiple methods research design was used for this study. The data collection methods for the quantitative approach were the pre-test, post-test and a questionnaire. The pre-test and post-test had predominantly problem-solving questions. The questionnaire and the tests were administered to 224 learners from four Pretoria East secondary schools from different environments. The data collection methods for the qualitative approach were the interviews with the Grade 11 Life Sciences teachers of the selected schools, lesson observations and relevant document analysis. The interviews were conducted with six Grade 11 Life Sciences teachers teaching at the four selected schools. Findings from both the quantitative and the qualitative approaches were integrated to give an in-depth understanding of the study. The findings show that there were significant differences between the means of the pre-test and the post-test for the total for the whole group of 224 learners. The variables in which the tests were categorised were the rote learning, problem-solving and three learning outcomes of the National Curriculum Statement (NCS). The way in which the learners answered the questions in terms of terminology they used, the confidence they displayed, the level of answering and the explanations they gave when they wrote the post-test were significantly different from when they wrote the pre-test. The significant differences between the means of the pre-test and the post-test may possibly have been due to the intervention. This showed the effectiveness of the intervention which was animal organ dissection in problem-solving. The study also showed that most teachers are not well-acquainted with problem-solving strategies which made it challenging for them to use animal organ dissections to develop problem-solving skills in learners. The attitudes of the teachers and learners towards animal organ dissection and its use in problem-solving as a teaching strategy were predominantly positive with less than a quarter of the whole group being negative due to a variety of reasons which include: moral values, religion, culture, blood phobia, squeamishness and being vegetarian. The majority of learners acknowledged the importance of animal organ dissections in developing skills like investigative, dissecting and problem-solving skills. This acknowledgement resulted in them being positive towards the use of animal organ dissections in problem-solving. One can conclude that animal organ dissections can be used in problem-solving as a teaching strategy in Life Sciences education. The level of learner engagement with animal organ dissections can determine the level of development of problem-solving skills as was evidenced by the differences between the mean scores of the four schools. The study recommended that the teachers should be encouraged to use animal organ dissections more frequently where it is applicable to develop problem-solving skills in learners and not merely let the learners cut, draw and label the organ. Teachers should also focus on problem-solving in general and develop this as a prime strategy. All activities should be prepared by the teacher and implemented in class to encourage and develop problem-solving skills. / Thesis (PhD)--University of Pretoria, 2013. / gm2014 / Science, Mathematics and Technology Education / restricted

Practical work is regarded as an essential part of learning; hence most tertiary institutions have included a practical component in their physics courses. There is a concern about the effectiveness of the practical work in most universities. The present study is a case study that assessed the contributions of simulations on Foundation Physics students’ practical work. In assessing the contribution of simulations, two tests, Determining and Interpreting Resistive Electric Circuits Concepts Test (DIRECT) and the Test of Integrated Science Process Skills (TISP) were used. A class test, observations and worksheets from students’ practical work were analyzed and interviews with a selected group were conducted. There were 20 Foundation Physics students participating from the University of Limpopo. Results indicated that the simulations contributed positively on students’ understanding of electric circuits. However the study revealed that the students who did simulations do not differ from those who did not do the simulations with regards to the development of process skills. / Institute of Science and Technology Education / M.Sc. (Physics Education)

The purpose of this research was to investigate the role that science education can play both in facilitating and in enhancing the delivery of environmental education at South African schools. The theoretical links between science education and environmental education were examined. This was followed by a practical investigation which involves the researcher conducting interviews with educators of natural science in order to determine their perspectives on the relationship between science education and environmental education. The results of the research indicate that science education has tremendous potential for incorporating and enhancing the delivery of environmental education. However, this potential is not being fuIly realised due to a number of limiting factors. It is, therefore, imperative that the education authorities take immediate action to rectify this situation so that the synergy between science education and environmental education comes to fruition. / Science and Technology Education / M. Ed. (Natural Science Education)

Over the last few years, the use of the web and simulation technologies in school education has become widespread. The purpose of this study was to compare the impact of a web-based Virtual Lab (WVL) environment with that of traditional educational experience in relation to conceptual understanding and science process skills in natural science for fourth grade primary school students. Using an instructional design model, the author developed a WVL; the design consisted of 3D animations and interactive experimental activities. The research instruments for the study were also developed; two online pre/post tests on conceptual understanding and science process skills were used to collect data. The sample used in the study consisted of 70 students from two primary language schools in Mansoura city, Dakahlyia Governorate, Egypt. The sample was divided into an experimental group and a control group. The author used an experimental design wherein the experimental group was exposed to the WVL, while the control group studied in a traditional setting and performed related activities. The pre-test results indicated that the entry-level for conceptual understanding in science and science process skills of both groups of students were equal, which guaranteed the reliability of the research. The findings of the post-test highlighted the following points: (a) Students in the experimental group had significantly higher mean scores in conceptual understanding especially in two of cognitive levels. (b) The experimental group performed better in science process skills, especially in five of these skills. (c) There was no significant difference in the performance of boys and girls within the experimental group for science process skills. (d) The estimation of the effect sizes (indication of the level of difference between the post-test scores of the experimental and control group) revealed that, the effect size was large for two skills, medium for three skills, and small for only one skill. In conclusions, the WVL provided considerable support for fourth grade students and helped them to improve their conceptual understanding in science and science process skills. These results go beyond previous research results, which did not focus on very young learners. The use of WVL contributed considerably in elevating learning outcomes; the results provided an empirical evidence of the advantages of web-based learning (WBL) for education policy makers. / In den letzten Jahren hat sich die Verwendung der Web-und Simulations-Technologien in der Schulbildung weit verbreitet. Der Zweck dieser Studie ist es, die Auswirkungen einer web-basierten Virtual Lab (WVL) Umgebung mit der traditionellen Lehr-Erfahrung in Bezug auf das konzeptuelle Verständnis und wissenschaftliche Prozessfähigkeiten in den Naturwissenschaften der vierten Klasse der Grundschulstudenten zu vergleichen. Mit einem didaktischen Design-Modell entwickelt der Autor ein WVL, gestaltet 3D Animationen und interaktive experimentelle Aktivitäten. Die Forschungsinstrumente für die Untersuchungen wurden auch entwickelt, zwei Online-Pre/Post-Tests zum konzeptionellen Verständnis und wissenschaftlichen Prozessfähigkeiten wurden verwendet um Daten zu sammeln. Die Uuntersuchungs besteht aus 70 Studenten aus zwei primären Sprachschulen in Mansoura Stadt, Dakahlyia Governorate, Ägypten. Diese wurden in eine experimentelle Gruppe und eine Kontrollgruppe aufgeteilt. Der Autor verwendet ein experimentelles Untersuchungsdesign, wobei bei der experimentellen Gruppe die WVL eingesetzt wurde, während die Kontrollgruppe in einem traditionellen Rahmen studierte. Die Pre-Test Ergebnisse zeigten, dass des Anfangsstadium des konzeptuelles Verständnisses von Wissenschaft und wissenschaftlichen Prozessfähigkeiten beider Gruppen von Studenten gleich sind. Die Ergebnisse nach dem WVL-Einsatz haben folgende Punkte hervorgehoben: (A) Studierende in der experimentellen Gruppe haben signifikant höhere Mittelwerte im konzeptionellen Verständnis vor allem in zwei der kognitiven Ebenen erreicht. (B) Die experimentelle Gruppe hat in den wissenschaftlichen Prozessfähigkeiten besser abgeschnitten, vor allem in fünf von diesen Fähigkeiten. (C) Es gab keinen signifikanten Unterschiede in den wissenschaftlichen Prozessfähigkeiten von Männern und Frauen innerhalb der experimentellen Gruppe. (D) Die Abschätzung der Wirkung des WVL-Einsatzes durch die Höhe der Differenz zwischen dem Pre- und Post-Test-Noten hat ergeben, dass die Wirkung für drei der Fähigkeiten mittelmäßig ist, für zwei Fähigkeiten sehr groß und nur für eine Fähigkeit klein ist. Die Schlussfolgerung ist, dass die WVL beträchtliche Unterstützung gewährt und hilft den Studenten der Klasse vier, ihr Verständnis für die Begriffe der Wissenschaft und der Prozessfähigkeiten zu entwickeln. Dieses Ergebnis geht weit über die bekannten Veröffentlichungen auf diesem Gebiet hinaus. Die Ergebnisse dieser Studie vertiefen das Verständnis über Lernergebnisse des Virtual Lab und sind eine Evidenz für die Vorteile von Web-Basiertem Lernens (WBL) mit Relevanz für politische Entscheidungsträger, auf diesen Ausbildungsgebiet.