. Beginners botany. Botany. Fig. 45. — Cross-section of Root, enlarged, showing root-hairs. cellular structure. The ropt-liair is a flrlicmte iuhulnr cell (Fig. 45), ivitliin which is contained living matter {j>rotoplas)n^; ami the protoplasuiie lining vievibrane of the ^vall governs the entrance of zvater and substances in solu- tion. Vic'xng 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 the
. Beginners botany. Botany. Fig. 45. — Cross-section of Root, enlarged, showing root-hairs. cellular structure. The ropt-liair is a flrlicmte iuhulnr cell (Fig. 45), ivitliin which is contained living matter {j>rotoplas)n^; ami the protoplasuiie lining vievibrane of the ^vall governs the entrance of zvater and substances in solu- tion. Vic'xng 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 germin- ated between layers of dark blotting paper or flannel. On the young roots they will be seen as a mould-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 (j). Air-spaces at <z; 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. Toronto : Macmillan
Size: 1700px × 1470px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectbotany, bookyear1921
