 |
Biology Guttman | |||||
|---|---|---|---|---|---|---|
|
Student
Online Learning Center
| ||||||
 | ||||||
|
|
Biology Guttman | |||||
|---|---|---|---|---|---|---|
|
Student
Online Learning Center
| ||||||
|
| ||||||
|
Class Activities |
Chapter 39: Plant Growth And Growth Regulators |
1. Relevance of Topic
Since we rely on plants as a main food source, and for clothing and housing, their success is critical to the success of the human species.
To maximize our use of plants as the basis for life on earth and for human populations, we need to understand how plant hormones work, so that we may manipulate them to our advantage.
2. Continuity
The preceding chapters on plant physiology and structure provide the basis for the discussion of how plant hormones regulate plant processes.
The next chapter on agriculture is best understood after covering this chapter's material on plant growth regulation.
3. Demonstration Activities
Text section 39.1
1. Using Figure 39.1 and a living plant that clearly demonstrates a phototropic tendency, discuss how phototropism benefits plants.
Text section 39.3
1. Figure 39.4 illustrates the critical difference between cell division and cell elongation as a means of plant growth.
Text section 39.4
1. Show Figures 39.5 and 39.6, point out the statocytes and discuss the evolutionary importance of gravitropism.
2. Gravitropic experiments have been carried out in outer space in an effort to understand how plants respond in a gravity-free environment. Consider asking students to hypothesize about the results of these experiments, or to research the results on their own.
Text section 39.5
1. Show Figure 39.7 to illustrate the effects gibberellic acid has on plants.
Text section 39.7
1. Show Figure 39.9 and discuss why apical dominance is advantageous to plants.
2. Bring two specimens of the same leafy dicot to class (e.g. Coleus) and allow one to grow freely but pinch off the apical stem regularly on the second plant. Observe and discuss how the plant shape changes over time. Show Figures 39.9 and 39.10 in conjunction with this demonstration.
Text section 39.8
1. Show Figure 39.13 and discuss how ethylene plays an important role in the ripening of fruit.
2. Ask the class to provide ideas on how the food industry uses the fact that ethylene is involved in ripening. For example, ask students to explain how fruit is shipped over long distances without over-ripening. Also, ask how fruit is brought to an appropriately ripe stage once it reaches the market.
Text section 39.9
1. Show Figure 39.15 to summarize the effects of plant hormones and environmental stimuli.
Text section 39.11
1. Show Figure 39.17 to illustrate how photoperiodism affects flowering in plants.
2. Show a time lapse film of a long-day plant flowering in response to day length.
Text section 39.13
1. Show Figure 39.20 to illustrate how gene mapping has helped answer many questions about the phytochrome system.
MHHE Home | About MHHE | Help Desk | Legal Policies and Info | Order Info | What's New | Get Involved
