. Practical text-book of plant physiology. Plant physiology. 86 RELATION OF PLANTS TO GRAVITATION hand and the tips made to sweep around in a circle. This motion results in winding the twining stem around a support. After, a time such stems generally lose their lateral geotropism and be- come weakly apogeotropic, which binds them more closely to the support. 133. Revolving Movement of Tips of Twining Plants. Select a strong plant of the bean, hop, morning glory, or other twining species and fasten the fully grown part of the stem to an upright stake or support, which will allow the immature in
. Practical text-book of plant physiology. Plant physiology. 86 RELATION OF PLANTS TO GRAVITATION hand and the tips made to sweep around in a circle. This motion results in winding the twining stem around a support. After, a time such stems generally lose their lateral geotropism and be- come weakly apogeotropic, which binds them more closely to the support. 133. Revolving Movement of Tips of Twining Plants. Select a strong plant of the bean, hop, morning glory, or other twining species and fasten the fully grown part of the stem to an upright stake or support, which will allow the immature internodes with a total length of 8 to 20 mm. to project above its upper Fig. 39. Twining plant being rotated on its own axis by a clinostat. The vine fails to clasp the support and must be held to it by cords. Draw a line along one side from the tip of the shoot to the point of attachment to the stake with India ink. Ten minutes after this has been done set up a small stake which shall mark the position of the tip, but which does not touch it or impede its free movement in any way. Set up a second stake in 20 minutes and another at the end of every 20 minutes for an hour, or until the tip has traversed a circle. Determine the region in which the curvatures are produced, and note the position of the ink line to. 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 MacDougal, Daniel Trembly, 1865-1958. New York [etc. ] Longmans, Green, and Co.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplantph, bookyear1901
