We are going to watch some plants grow. Then you will know what they do. Stick three toothpicks into the middle of a sweet potato. Balance the toothpicks on top of a glass jar filled with water so that one-half of the sweet potato is below water. Wait a few days and ask the children what changes they observed.
Stems are also parts of plants.
Someone come and show the class where the stem is on this plant. The trunk of a tree is a stem. Flowers have soft, thin stems. The trunk of a tree is a stem. Let's find out.