. Foundations of botany. Botany; Botany. 60 FOUNDATIONS OF BOTANY The growing tip of the root, as it pushes its way through the soil, is exposed to bruises; but these are largely warded ofE by the root-cap. The tip also shows a remarkable sensitiveness to contact with hard objects, so that when touched by one it swerves aside and thus finds its way downward by the easiest path. Roots with an unequal water supply on either side grow toward the moister soil. Roots are very tough, because they need to resist strong. Fig. 28. — Koots of a Western Hemlock exposed by having most of the Leaf-Mould ab
. Foundations of botany. Botany; Botany. 60 FOUNDATIONS OF BOTANY The growing tip of the root, as it pushes its way through the soil, is exposed to bruises; but these are largely warded ofE by the root-cap. The tip also shows a remarkable sensitiveness to contact with hard objects, so that when touched by one it swerves aside and thus finds its way downward by the easiest path. Roots with an unequal water supply on either side grow toward the moister soil. Roots are very tough, because they need to resist strong. Fig. 28. — Koots of a Western Hemlock exposed by having most of the Leaf-Mould about them burned away by Forest Fires. pulls, but not as stiff as stems and branches of the same size, because they do not need to withstand sidewise pres- sure, acting from one side only. The corky layer which covers the outsides of roots is remarkable for its power of preventing evaporation. It must be of use in retaining in the root the moisture which otherwise might be lost on its way from the deeper rootlets (which are buried in damp soil), through the upper' portions of the root-system, about which the soil is often very 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 Bergen, Joseph Y. (Joseph Young), 1851-1917; Eastwood, Alice, 1859-1953. Boston, Ginn & Co.
Size: 1992px × 1254px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1901
