. Botany for secondary schools; a guide to the knowledge of the vegetation of the neighborhood. Plants. OSMOSIS AND SAP-PRESSURE 73 placed in weak sugar solution (each cell having a concen- tration greater than the outside solution), it takes up water. The slices of tuber in the strong solution lose water because the concentration of the external solution is stronger than that of the cell-sap. 152. The root-hairs are able to take up water from the soil because the soil solution is extremely dilute. If the soil solution were strong, the plant might give up water to the soil. It would be possibl
. Botany for secondary schools; a guide to the knowledge of the vegetation of the neighborhood. Plants. OSMOSIS AND SAP-PRESSURE 73 placed in weak sugar solution (each cell having a concen- tration greater than the outside solution), it takes up water. The slices of tuber in the strong solution lose water because the concentration of the external solution is stronger than that of the cell-sap. 152. The root-hairs are able to take up water from the soil because the soil solution is extremely dilute. If the soil solution were strong, the plant might give up water to the soil. It would be possible to add so much fertilizer to the land as to cause the plant to lose water by exosmosis. There is seldom, however, any danger that the farmer or gardener will add so much fertilizer to the soil, in practice, as to cause a wilting of the plant due to loss of water by exosmosis. 153. The water and salts in solution taken up by the root-hairs pass into the root proper and finally into definite routes that are con- tinuous from the root through the stems to the leaves. To illustrate the path of water-ascent, insert a growing shoot in water that is colored with eosin. (Eosin may be had of dealers in microscopic supplies. Common aniline may answer very well.) The tissues stained with the dye are the conducting tissues. In woody plants, the water is conducted in the young wood, not between the bark and wood as commonly supposed. 154. The absorption of water by a root may be so rapid as to give rise to distinct pressure. This force is root- or sap-pressure. It varies in different plants and in the same plant at different times. The "bleeding" of plants is a manifesta- tion of this pressure. In the spring, the. 124. To show 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. (Liber
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplants, bookyear1913
