Hong Kong Primary 4 Science Curriculum

Overview: This course aims to guide Grade 4 primary students in mastering core scientific inquiry methods, with a focus on designing fair tests and controlling variables. Students will learn to differentiate between scientific inquiry and engineering design, and understand that scientific conclusions must be based on objective evidence rather than personal feelings—thereby cultivating a rigorous scientific mindset.

Learning Outcomes:

• Identify and apply the three variables in fair testing: the changing factor, the measured factor, and the controlled factor.
• Distinguish between scientific inquiry (discovering natural laws) and engineering design (solving real-world problems), recognizing their similarities and differences.
• Understand the importance of scientific objectivity and learn to derive conclusions based on test evidence rather than preconceived opinions or feelings.

Overview: This lesson enables Grade 4 students to understand the fundamental definitions and distinctions between infectious and non-infectious diseases, with special emphasis on the transmission pathways and preventive measures for influenza. Through experimental observation of how masks block droplets, students will learn to support preventive behaviors with scientific evidence and appreciate the critical role of scientific advancement in public health and societal disease prevention.

Learning Outcomes:

• Differentiate the main characteristics and distinctions between infectious and non-infectious diseases.
• Recognize the transmission routes of influenza (e.g., droplets, contact) and practice correct preventive actions (e.g., handwashing, wearing masks).
• Observe experimentally how masks block respiratory droplets and draw reasonable scientific conclusions based on results.

Overview: This lesson guides Grade 4 students in exploring the process by which plants continue their life cycle. Topics include observing floral structures in flowering plants, pollination and seed formation, conditions for seed germination, and an in-depth exploration of how plants reproduce not only via seeds but also through vegetative organs such as roots, stems, and leaves—ultimately understanding the central significance of reproduction for life continuity.

Learning Outcomes:

• Observe and accurately draw the main structures of flowers, understanding the role of each part in reproduction.
• Describe the basic conditions required for pollination, seed formation, and seed germination (water, air, suitable temperature).
• Provide examples of how plants use roots, stems, and leaves for vegetative propagation (e.g., sweet potato, onion, sedum).

Overview: This lesson introduces students to the fundamental concept of "heredity"—how offspring inherit traits from their parents. By observing specific physical characteristics (e.g., tongue-rolling ability, eye color), students will learn to distinguish between inherited traits and those acquired through experience, fostering a correct value system that respects individual differences and life diversity.

Learning Outcomes:

• Accurately define "hereditary traits" and understand that they originate from parent organisms.
• Provide examples and distinguish between human hereditary traits (e.g., eye color) and acquired traits (e.g., riding a bicycle).
• Recognize similarities and differences among individuals and learn to respect diverse expressions of heredity.

Overview: This lesson explores the unique features of different natural environments on Earth (e.g., tropical rainforests and deserts) and explains how organisms adapt to these environments through physical structures and behavioral traits to ensure survival. Additionally, it encourages students to consider the impact of human activities on habitats, fostering a sense of responsibility toward protecting nature.

Learning Outcomes:

• Identify and compare environmental differences between tropical rainforests and deserts in terms of moisture and temperature.
• Provide examples of how organisms adapt to their environment through body structures (e.g., thick fur) or behaviors (e.g., migration).
• List ways in which human activities affect habitats and understand the importance of environmental protection.

Overview: This lesson guides students in understanding feeding relationships among organisms in nature. By learning about food chain components (producers and consumers), predator-prey interactions, and competition for essential resources (such as light, water, and food), students will grasp the fragility and importance of ecological balance and be able to predict the impacts of disruptions in any link of the food chain on the entire ecosystem.

Learning Outcomes:

• Correctly identify and draw food chains, explaining the roles of producers and consumers.
• Distinguish between predator-prey relationships and explain why organisms compete for resources.
• Predict and analyze the cascading effects on ecological balance when populations of certain species change or disappear.

Overview: This lesson helps Grade 4 students distinguish between two fundamental types of changes in everyday materials: physical changes and chemical changes. By understanding material properties, students will learn to apply scientific knowledge to engineering design—particularly in the design, testing, and improvement of insulated containers—demonstrating the scientific spirit of "learning for application."

Learning Outcomes:

• Identify and differentiate between physical changes (no new substances formed) and chemical changes (new substances formed).
• Understand how the properties of different materials determine their specific uses in daily life (e.g., insulating materials).
• Recognize the importance of "testing and improving" in the engineering design cycle and explain its role in making insulated containers.

Overview: This lesson helps students understand the diverse sources of energy and their central role in modern life—especially in powering electronic devices. By recording and analyzing daily energy usage habits, students will comprehend the environmental impact of energy waste and learn practical ways to conserve energy at school and home, building a sense of responsibility for protecting the Earth.

Learning Outcomes:

• Identify and list common energy sources (e.g., solar, hydro, coal, oil).
• Explain the relationship between electronic devices and energy supply, understanding how energy powers device operation.
• Demonstrate the ability to record and analyze energy-wasting behaviors and propose concrete measures to reduce electricity consumption.

Overview: This course introduces Grade 4 students to basic concepts in optics, including distinguishing between luminous and reflective objects (especially the Moon’s characteristics), understanding how smooth surfaces form reflections, and observing how shadow length changes with the position of the Sun. It culminates in highlighting ancient people's scientific wisdom in inventing the sundial by applying these principles for timekeeping.

Learning Outcomes:

• Correctly identify light sources and explain why the Moon is not a light source.
• Understand the phenomenon of specular reflection and explain why smooth surfaces (e.g., mirrors) produce clearer reflections than rough surfaces (e.g., walls).
• Master the pattern of shadow length variation and explain how sundials use light and shadows to measure time scientifically.

Overview: This lesson focuses on helping students understand the basic principles of electric current flow, recognize the conditions for a closed circuit, and analyze the operation of simple devices like flashlights. By learning troubleshooting techniques and electrical safety rules, students will transform scientific knowledge into awareness of safety and practical skills in daily life.

Learning Outcomes:

• Identify and explain the conditions for a closed circuit and the path of electric current.
• Analyze the basic structure and function of simple devices (e.g., flashlight) and diagnose common causes of bulb failure.
• List and follow basic electrical safety rules for use in class and daily life.

Overview: This course helps students understand friction and its fundamental characteristics. It covers the directionality of friction (opposite to motion), how surface properties affect frictional force, and real-life applications of friction—including how design (e.g., tread patterns on shoe soles) can increase friction, or how to reduce it when needed.

Learning Outcomes:

• Correctly identify the direction of friction relative to the direction of motion.
• Explain how surface properties (rough or smooth) affect the magnitude of friction.
• Provide examples of practical applications in daily life for increasing and reducing friction, along with explanations for their use.

Overview: This lesson guides Grade 4 students in exploring our planet Earth, covering the layered internal structure (crust, mantle, core), the three major types of rocks forming the crust, and the composition of soil. The focus is on helping students understand that Earth is not a solid, homogeneous sphere and recognize the importance of loam soil for plant growth.

Learning Outcomes:

• Accurately identify the three layers of Earth’s interior: crust, mantle, and core.
• Identify and name the three major types of rocks found in the crust.
• List the main components of soil and explain why loam is most favorable for plant growth.

Overview: This lesson helps students distinguish between short-term "weather" and long-term "climate," and understand key scientific factors used to describe weather. It further explores the profound impacts of global warming on Earth’s environment (e.g., glaciers and sea levels) and inspires students to take action in daily life to reduce their "carbon footprint," making responsible choices for environmental protection.

Learning Outcomes:

• Accurately state the main difference between weather and climate in terms of time scale.
• List key factors used to describe weather (e.g., temperature, rainfall, humidity).
• Identify environmental consequences of global warming and propose specific methods to reduce carbon footprint.

Overview: This lesson helps students understand how aerospace technology has entered everyday life, including the diverse applications of artificial satellites and consumer products inspired by space technology. Students will also learn about the special requirements imposed by space environments on equipment and understand the core engineering principle of solving problems through continuous "testing and improvement."

Learning Outcomes:

• List specific applications of artificial satellites in daily life (e.g., positioning and navigation, weather monitoring).
• Identify and provide examples of everyday products developed from space technology.
• Understand how the unique conditions of space influence engineering design and recognize the necessity of testing and improvement in the design process.