Worksheet: Hormonal Regulation in Plants



Worksheet: Hormonal Regulation in Plants and External Factors that Affect GrowthChapter 18Name and describe the five major classes of plant hormones. Class of Plant HormoneWhere it is madeHow it is transportedResponses it causesDefine the term plant hormone. Provide an example of how a single aspect of growth and development may be influenced by several hormones. Calcium influences several effects of plant hormones. Why, then, isn’t calcium considered a plant hormone? Provide an example for each of the following generalizations:A single plant hormone can produce many effects.The effects elicited by a hormone depend on many factors, including the presence of other hormones.Hormonal responses can result from changing ratios of hormones rather than from the presence or absence of an individual hormoneGibberellins, cytokinins, and auxin all promote growth. How would you distinguish them from one another?What is the adaptive significance of increased ethylene production in response to wounding and stress?Home gardeners commonly pinch off the shoot tips of certain plants in order to promote fuller, bushier growth. Explain why removal of the shoot tip should promote such growth. In what way is ethylene a unique plant hormone?Chapter 19What is phototropism and which hormone is involved in this phenomena? What is the adaptive significance of phototropism? Define photoperiodism and describe its adaptive significance.What causes leaves to change color in the autumn and senescence?Describe structural and chemical changes that may occur in a plant as it begins dormancy. What triggers this decrease in metabolism? What influences the resumption of metabolic activity?Many plants produce seeds that require a period of dormancy before they will germinate. Of what value is the dormancy to the plant? Where might you expect to find plants with seeds that do not undergo dormancy?What is the adaptive significance of geotropism? ................
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