. Botany for secondary schools; a guide to the knowledge of the vegetation of the neighborhood. Plants. %&> r£k %&»' -1: CHAPTER II THE ROOT 20. The Root System.—The offices of the root are to hold the plant in place, and to absorb water and mineral substances. Not all roots, however, absorb water and mineral nutrients. 21. The entire mass of roots of any plant is called its root system. The root system may be annual, biennial or perennial, herbaceous or woody, deep or shallow, large or small. 22. Kinds of Roots — A strong leading central root, which runs directly downwards, is a ta
. Botany for secondary schools; a guide to the knowledge of the vegetation of the neighborhood. Plants. %&> r£k %&»' -1: CHAPTER II THE ROOT 20. The Root System.—The offices of the root are to hold the plant in place, and to absorb water and mineral substances. Not all roots, however, absorb water and mineral nutrients. 21. The entire mass of roots of any plant is called its root system. The root system may be annual, biennial or perennial, herbaceous or woody, deep or shallow, large or small. 22. Kinds of Roots — A strong leading central root, which runs directly downwards, is a tap-root. The side or spreading roots are usually smaller. Plants that have such a root system are said to be tap-rooted. Examples are red clover, beet, turnip, radish, burdock, dandelion, alfalfa. (Fig. 8.) 23. A fibrous root system is one that is composed of many nearly equal, slen- der branches. The greater number of plants have fibrous roots. Examples are many common grasses, wheat, oats, corn, and most trees. The bean in Fig. 2 has a fibrous root system. 24. Shape and Extent of the Root System.—The depth to which roots extend depends on the kind of plant and the (7) i^£>. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bailey, L. H. (Liberty Hyde), 1858-1954. New York, Macmillan
Size: 2350px × 1063px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectplants, bookyear1913
