2. Wash mung beans: Wash mung beans with clear water to remove impurities on the surface.

3. Prepare the paper cup: coat a layer of water on the inner wall of the paper cup, and then punch a few small holes at the bottom of the paper cup to drain water.

4. Adding soil: Pour the soil into the paper cup and fill it to about one third of the paper cup.

5. Add mung beans: put mung beans on the soil surface and gently press them to make them contact with the soil.

6. Add water: Add enough water to the paper cup to make the soil moist.

7. Placement: Place the paper cup in a well-lit place to avoid direct sunlight.

8. Water every day: water every morning and evening to keep the soil moist.

9. Wait for growth: After about 3-5 days, mung beans will sprout and grow. At this time, the paper cup can be moved to a well-lit window, so that mung beans can fully absorb sunlight and promote growth and development.