30. Q. When it becomes solid how is it known? A. As woody tissue.
31. Q. How is common wood made up? A. Of a number of these cells arranged side by side.
32. Q. Of what shape may vegetable cells be? A. They may be globular, oval, conical, prismatic, cylindrical, branched, or of any other form.
33. Q. What are some of the varieties of formed material into which the bioplasm within the cell wall may be transformed? A. They may be solid, as coloring matter, starch, crystals, and resin; or fluid, as oil and gum, or solutions of sugar or tannin.
34. Q. What is the most important of these substances called? A. Chlorophyll, the source of the green color of plants.
35. Q. What other product of vegetable cells is even more widely distributed than chlorophyll? A. Starch.
36. Q. How do cells generate? A. By self-multiplication.
37. Q. What are the simplest forms of plant life? A. Those that consist of a single cell.
38. Q. In the higher classes of plants what is the character of the union of cells which forms tissues and organs? A. It is permanent.
39. Q. What are made by the union of cells into groups? A. The woody fibers of plants, and the cellular tissue which makes the softer, fleshy and pithy parts.