Improving the students" key competeneies in biological sciences is the core task of secondary school biology curriculum. Biological ideas are the overall understanding of life science and biology, and the foundation and pillar of key competencies in biological sciences. Based on the analysis of basic task, concept system and philosophy of life science, biological ideas include the ideas about the nature of biology and the ideas of life. The ideas about the nature of biology is the understanding of the nature of biological science, and the idea...