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Lab Report 2 120

Lab Report 2 120 - SOYUN KIM The Effects of Tropisms...

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SOYUN KIM The Effects of Tropisms, Hormone Treatment, and Light Treatment on Plant Growth [Type the document subtitle] X 11/14/2007 [Type the abstract of the document here. The abstract is typically a short summary of the  contents of the document. Type the abstract of the document here. The abstract is typically a  short summary of the contents of the document.]
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Introduction A hormone is a chemical messenger that carries a signal from one cell (or group of cells) to  another. Plant Hormones control or regulate germination, growth, metabolism, or other physiological  activities. Plants - sensitive to the changes in their environment - respond in directional movements called  tropisms by the release of hormones. Plants also respond to a particular duration of light and dark hours  in a response known as photoperiodism; it is regulated by a blue-green pigment found in the plasma  membrane of plant cells, known as phytochrome. This experiment was performed to investigate plant  tropisms, as well as the role of auxin in apical dominance and the effects of light on germination. Materials and Methods Experiment 1 14 day-old  Raphanus  seedlings were grown with a light source positioned to one side of the pot.  A lining of moist paper towers was prepared on a cafeteria tray and corn seeds were distributed in  different orientations on the paper towels. The seeds were covered with another layer of moist paper  towels. A tray was then placed on top of the paper towels to hold the corn seeds in place. After 3 days the  trays were removed. We then observed the direction of the roots of each germinating corn seed.
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Lab Report 2 120 - SOYUN KIM The Effects of Tropisms...

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