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. Add a few drops of food coloring. We are going to check the stalk of celery in about two hours. A leaf is also a part of a plant.