This paper presents part of the findings from a comparative study on existing and proposed science curricula of grades IX-X in Bangladesh. It aims to explore relevant research to find out what ideas about science are recommended to include in school science curriculum, and then to compare the existing and proposed curricula in terms of ideas about science. This interpretive study analyzed curriculum documents and textbooks qualitatively, and the results reveal that the proposed science curriculum portrays more ideas about science compared to the existing two science curricula. However, some important ideas about science have not been portrayed well in the proposed curriculum, and therefore, there is a broad scope for improvement in communicating ideas about science.