Questions on Lesson III.
1. How does water travel in a plant? How can you prove this? 2. If we enclose a leafy plant in a glass vessel, we see that water is given off by the leaves. How is it that we do not see this water when the plant is grown in the open air? 3. What is “sap”? Where is it first formed? How does it travel in the twig or stem? 4. If we keep ferns growing under a glass bell—or in a glass case—we never have to water them. Can you explain this?