PBIO 1210 Lecture Notes - Lecture 10: Heliotropism, Phototropism, Auxin
17 Feb 2018
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Tropism: any growth response that results in curvature of whole plant organs toward or away from stimuli. The growth of a shoot toward light is called positive phototropism; growth away from light is negative phototropism. Heliotropism: the directional growth of a plant in response to sunlight: prevails extensively among the higher plants, there"s very few plants where nothing bends toward a lateral light. Almost every type of plant is sensitive to light and bends toward to light. An educated preliminary explanation based on past observations. To be useful, it must be testable using available techniques. It"s then used to select the type of data that must be collected in order to test it. Testing hypotheses may consist of experiments or sets of observations. Such tests may support the hypothesis in question or not. If not supported by the data, the hypothesis must be altered and retested, or rejected. Theory a set of related hypotheses that have widely supported by data.
