Examining the coherence of the curriculum content in the biology textbooks of the senior high school

The aim of this study was to investigate the coherence of the content of the biology textbooks of the second year of high school. For this purpose, four indicators of breadth, continuity, sequence and integration in the mentioned books were examined using qualitative content analysis. The sample of the research was all textbooks and textbooks of biology teacher in the second year of high school in the academic year 2019-2020. The results of the data analysis showed that in the scope index, the 11th and 12th grade books fully complied with the content and performance standards, but the 10th grade does not have these standards. In the continuity index, the content of the second year of high school is in a good condition and more than 90% of the content is related to continuity. In the sequence index, as an example of the 12th grade textbook, it was found that it does not follow any of the sequence methods in the literature of this field. In the integration index, it was found that this index has not received much attention.