. Beginners' botany. Botany. Fig. 45. — Cross-section of Root, enlarged, showing root-hairs. cellular structure. The root-hair is a delicate tubular cell (Fig. 45), within which is contained living matter {jirotoplasjn); and the protoplasmic linitig membrane of the wall governs the entrance of water and substances in solu- tion. Being long and tube- like, these root-hairs are especially adapted for tak- ing in the largest quantity of solutions; and they are the principal means by which plant-food is absorbed from the soil, although the sur- faces of the rootlets them- selves do their part. Wat
. Beginners' botany. Botany. Fig. 45. — Cross-section of Root, enlarged, showing root-hairs. cellular structure. The root-hair is a delicate tubular cell (Fig. 45), within which is contained living matter {jirotoplasjn); and the protoplasmic linitig membrane of the wall governs the entrance of water and substances in solu- tion. Being long and tube- like, these root-hairs are especially adapted for tak- ing in the largest quantity of solutions; and they are the principal means by which plant-food is absorbed from the soil, although the sur- faces of the rootlets them- selves do their part. Water plants do not produce an abundant system of root-hairs, and such plants depend largely on their rootlets. The root-hairs are very small, often invisible. They, with the young roots, are usually broken off when the plant is pulled up. They are best seen when seeds are germi- nated between layers of dark blotting paper or flannel. On the young roots, they will be seen as a mold-like or gossamer- like covering. Root-hairs soon die: they do not grow into roots. New ones form as the root grows. Osmosis. — The water with its nourishment goes through the thin walls of the root-hairs and rootlets by the process of osmosis. If there are two liquids of different density. Fig. 46. — Root-hair, much en- larged, in contact with the soil particles (s). Air-spaces at a; water-films on the particles, as at 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, The Macmillan company
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