Practical activities play a crucial role in CBSE Class 7 Science as they help students understand the concepts in a more hands-on and interactive manner. These activities provide opportunities for students to observe, explore, experiment, and analyze various scientific phenomena. Here are some practical activities that can be conducted in CBSE Class 7 Science:

1. Experimenting with magnets:
- Students can perform experiments to understand the properties of magnets.
- They can explore the concepts of magnetism, magnetic poles, magnetic fields, and magnetic forces.
- Activities such as testing the attracting and repelling forces of magnets, making a compass, and understanding the Earth's magnetic field can be performed.

2. Investigating light and its properties:
- Students can perform experiments to understand the properties of light, such as reflection, refraction, and dispersion.
- Activities such as making a periscope, studying the formation of shadows, and exploring the refraction of light through different mediums can be conducted.

3. Exploring the plant kingdom:
- Students can conduct activities to study the various parts of plants, their functions, and the process of photosynthesis.
- Activities such as dissecting a flower, observing the growth of plants, and conducting experiments to understand the role of sunlight and water in plant growth can be performed.

4. Investigating chemical reactions:
- Students can perform experiments to understand the concepts of chemical reactions, reactants, and products.
- Activities such as observing the effects of acids and bases on different substances, testing the reactivity of metals, and understanding the process of rusting can be conducted.

5. Studying the human body:
- Students can conduct activities to explore the major systems of the human body, such as the digestive system, respiratory system, circulatory system, and skeletal system.
- Activities such as making models of organs, conducting experiments to understand the process of digestion, and studying the structure and function of bones can be performed.

These practical activities not only enhance the understanding of scientific concepts but also develop important skills such as observation, analysis, and critical thinking. They make the learning process more engaging and memorable for students. It is important for teachers to provide adequate guidance and supervision during these activities to ensure safety and effective learning outcomes.