. Botany; an elementary text for schools. Plants. ROOT STRUCTURE 65 germinate radish or other seed, so that no delicate parts of the root will be injured. For this purpose, place a few seeds in packing-moss or in the folds of cloth or blotting paper, being careful to keep them moist. In a few days the seed has germinated, and the root has grown an inch or two long. Notice that, excepting at a distance of about a quarter of ; an inch behind the tip, the root is covered with minute hairs , ' (Figs. 11, 104). They are actu- t \ ally hairs, that is, root-hairs. I Touch them and they collapse, they
. Botany; an elementary text for schools. Plants. ROOT STRUCTURE 65 germinate radish or other seed, so that no delicate parts of the root will be injured. For this purpose, place a few seeds in packing-moss or in the folds of cloth or blotting paper, being careful to keep them moist. In a few days the seed has germinated, and the root has grown an inch or two long. Notice that, excepting at a distance of about a quarter of ; an inch behind the tip, the root is covered with minute hairs , ' (Figs. 11, 104). They are actu- t \ ally hairs, that is, root-hairs. I Touch them and they collapse, they are ^ so delicate. Dip one of the plants in I \ water, and when removed the hairs are ''\ not to be seen. The water mats them 1 together along the root and they are no longer evident. Root-hairs usually are * destroyed when a plant is pulled out of t . âi^ the soil, be it done ever so carefully. '..'...ii'm"'" â ^ilnwi',','-''t'i'ie They cling to the minute particles of covering of root-hairs. ^qW Under a microscopc, observe how they are flattened when they come in contact with grains of sand (Chapter II). These root-hairs clothe the young rootlets, and a great amount of soil is thus brought into actual contact with the plant. Root-hairs are not young roots : they soon die. 138. The rootlet and the root-hair differ. The rootlet is a solid, connpact structure. The root-hair is a delicate tube (Fig. 105), tvithin the cell-tvall of which is contained living matter {protoplasm); the ivall and the lining mem- brane permit water and substances in solution to pass in. Being long and tube-like, these root-hairs are espe- cially adapted for taking iu the largest quantity of solu-. 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 Co.
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