. Beginners' botany. Botany. Fig. 48. —The Mark- ing OF THE Stem AND Root. Fig. 49. —The Result. root can be deter- mined. Give a reason why a root cannot elongate throughout its length, — whether there is anything to pre- vent a young root from doing so. In Fig. 48 is shown a germinating scarlet runner bean with a short root upon which are marks made with waterproof ink; and the same root (Fig. 49) is shown after it has grown longer. Which part of it did not lengthen at all 1 Which part lengthened slightly .' Where is the region of most rapid growth.' Geotropism. — Roots turn to- ward the ear
. Beginners' botany. Botany. Fig. 48. —The Mark- ing OF THE Stem AND Root. Fig. 49. —The Result. root can be deter- mined. Give a reason why a root cannot elongate throughout its length, — whether there is anything to pre- vent a young root from doing so. In Fig. 48 is shown a germinating scarlet runner bean with a short root upon which are marks made with waterproof ink; and the same root (Fig. 49) is shown after it has grown longer. Which part of it did not lengthen at all 1 Which part lengthened slightly .' Where is the region of most rapid growth.' Geotropism. — Roots turn to- ward the earth, even if the seed is planted with the micropyle up. This phenomenon is called posi- tive geotropism. Stems grow away from the earth. This is negative 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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