Science and technology projects suitable for first grade are introduced as follows:

The following are science and technology projects suitable for first grade:

1. Paper airplane: use a piece of paper to fold into the shape of an airplane, which allows you to test the effect of different shapes and folding methods on the distance and stability of flight.

2. water rocket: use a plastic bottle, balloon and water to make a simple water rocket and observe the effect of air pressure and thrust on the flight of the rocket.

3. Solar Car: Using a solar panel, an electric motor and batteries, make a simple solar car and observe the effect of converting solar energy into electricity.

4. Windmill: Using cardboard, bamboo sticks and glue, make a small windmill and observe the effect of wind force on the rotation of the windmill.

5. Simple Circuits: Using wires, batteries, and a small light bulb, make a simple circuit and learn about the flow of electricity and the basic principles of circuits.

6. Plant growth experiment: choose different plant seeds and put them under different conditions (such as sunlight, water, temperature, etc.) to observe the growth of plants and learn the factors affecting plant growth.

7. Magnet experiment: use a magnet and some metal objects, observe the magnet's attraction to metal objects, learn the nature and principles of magnets.

8. Water Floating Experiment: using objects of different materials (e.g. wooden blocks, plastic balls, etc.), put them into the water to observe their buoyancy and sinking, and learn the principle of buoyancy.

These small production projects can help first graders develop their scientific thinking and experimental skills through practice and observation. Also, these projects can help students understand some basic scientific principles and concepts.