Exercises on Lesson XI.
1. Dig up a primrose plant, and make a rough sketch showing underground stem, roots, and leaves. 2. An underground stem may be of use to a plant in three different ways. Can you name them? 3. There are two distinct kinds of underground stems—those that grow quickly and those that grow slowly. Name three of each kind, and tell how they differ in shape. 4. Compare a potato with a horse-chestnut twig. Supposing your twig to be swollen out with plant-food, what parts of it do the “eyes” of the potato represent? What do the {scars/marks} near the “eyes” represent?