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This research presents the development of inquiry model (5Es) based instructional package for grade 10 students on “Biomolecules”. The sample group was chosen using cluster random sampling and consisted of 43 grade 10 students (academic year 2017) from a high school in Nonthaburi Province. The tools for data collection were a learning achievement survey form on “Biomolecules”, an analytical thinking ability survey form on biomolecules, a post-instructional package record, and student learning records. The research methodology was a one group pretest-posttest design. The data was analyzed by using mean, percentage, standard deviation, and t-test for dependent samples.
The results of the research reveal that the efficiency of the 5Es instructional package on biomolecules or E1/E2 was 81.20/80.10. The students’ posttest scores and analytical thinking score were higher than their pretest ones, with a statistical significance at 0.01 level.
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