【Shanghai Edition】Junior High School Science Grade 9, Semester 2

📚 Content Summary

This course covers the science curriculum for the ninth grade, lower secondary school, systematically exploring the evolution of the universe and stars, biological genetics and biodiversity conservation, healthy lifestyles, human immune mechanisms, resource environment and sustainable development, and the role of science and technology in advancing human civilization.

Explore the scientific mysteries from cosmic stars to life at the microscopic level, and practice a healthy, sustainable way of living.

Author: Shanghai Education Publishing House

Acknowledgments: Compulsory Education Textbook, reviewed and approved by the Ministry of Education 2013

🎯 Learning Objectives

1. Spatial Cognition: Describe the structure of the Milky Way (galactic center, galactic disk, galactic halo) and its position within the universe; distinguish between extragalactic galaxies and galaxy clusters.
2. Evolutionary Logic: Explain the physical process of stellar evolution—from birth to supernova explosion, forming neutron stars or black holes—and relate Earth’s formation to climate change.
3. Application of Scientific Theories: Understand the basic assumptions of special and general relativity (e.g., constancy of light speed, spacetime curvature), and use the Doppler effect to explain galactic redshift and cosmic expansion.
4. Elaborate on Heredity and Variation: Recognize biological heredity, describe the double-helix structure of DNA and its function as the primary genetic material, and understand the relationship among genes, DNA, and chromosomes.
5. Analyze Sex Determination and Genetic Applications: Explain the mechanism of human sex determination, understand the fundamentals of genetic engineering, and list preventive measures for human genetic disorders and their eugenic significance.
6. Investigate Evolution and Biodiversity: Provide examples of evidence for biological evolution (e.g., fossils), comprehend the chemical origin-of-life hypothesis, and articulate the value (genetic, species, ecosystem) and conservation pathways of biodiversity.
7. Cognitive Level: Accurately state the World Health Organization’s definition of “health” and differentiate between health, disease, and sub-health states.
8. Analytical Level: Through case analysis, identify the specific impacts of diet, genetics, lifestyle, and psychological factors on health, and understand the biopsychosocial-medical model.
9. Application Level: Recognize the value of aerobic exercise and apply learned knowledge to reflect on personal lifestyle, developing preliminary health management strategies.
10. Accurately describe the three main functions of the immune system and define infectious diseases along with types of pathogens.