Biology Homework Chapter 33: Plant Hormones
Textbook Assignment: Chapter 33: Control Systems in Plants, sections 1-8.
- 33.1 Studies of phototropism (the tendency of plants to turn toward light) reveal the activity of hormones in plants. The experiments conducted by Charles and Francis Darwin, Peter Boysen-Jensen, and Frits Went also provide a good example of proper experimental techniques, including the use of controls.
- 33.2 Five major groups of hormones control plant growth and development.
- 33.3 Auxins stimulate the elongation of cells in shoots and roots.
- 33.4 Cytokinins stimulate cell division.
- 33.5 Gibberellins affect stem elongation and fruit development.
- 33.6 Abscisic acid inhibits plant processes; when washed out of seeds by water or broken down by cold weather, seeds come out of dormancy.
- 33.7 Ethylene produced in the tissues of ripening fruits causes ripening to continue; retard ripening by flushing the ethylene.
- 33.8 Synthetic or extracted plant hormones are used in agriculture to stimulate plant responses and control crop production, but also to control undesirable plants such as weeds.
Read the following weblecture before chat: Plant Control Systems
Take notes on any questions you have, and be prepared to discuss the lecture in chat.
Perform the study activity below:
Use the experiment on How Hormones Protect Seed Development in Peas at the Raven Student Center to investigate hormone effects on plant germination.
- Read Explore the Issue Being Investigated and Gain and Overview of the Experiment
- Read through the original research paper.
- Conduction your own virtual experiment to explore the results of the original research paper. Did your results confirm the investigator's findings?
Chat Preparation Activities
- Essay question: The Moodle forum for the session will assign a specific study question for you to prepare for chat. You need to read this question and post your answer before chat starts for this session.
- Mastery Exercise: The Moodle Mastery exercise for the chapter will contain sections related to our chat topic. Try to complete these before the chat starts, so that you can ask questions.
- No quiz yet: the Chapter Quiz opens when we finish the chapter.
Read through the lab for this week; bring questions to chat on any aspect of the lab, whether you intend not perform it or not. If you decide to perform the lab, be sure to submit your report by the posted due date.
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