Biology Homework Chapter 33: Plant Response to Stimuli
Textbook Assignment: Chapter 33: Control Systems in Plants, sections 9-13.
- 33.9 Tropisms are behaviors in response to particular stimuli. Phototropism (to light), gravitropism (to gravity), and thigmotropism (touch).
- 33.10 Plants have internal clocks that regular activities such as stomata opening and flowering.
- 33.11-12 Short-day plants flower in late summer when the far-red light at sunset stimulates phytochrome Pfr levels. Long-day plants flower in spring when the red light at sunrise inhibits Pr by changing it to Pfr.
- 33.13 Plants have physical defenses (thorns) and chemical defenses (poisons). Some plants acquire resistances the way animals acquire immunities.
Read the following weblecture before chat: Plant Responses
Take notes on any questions you have, and be prepared to discuss the lecture in chat.
Perform the study activity below:
Use the Plant Tropic Responses page to explore tropisms in different plants. In particular, view the short movies showing the respons of Arabidopsis shoots to light, the sunflower plant leaves to the sun's position, and the Coeleus shoot to gravity directions.
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.
- Required: Complete the Mastery Exercise with a score of 85% or better.
- Optional: Test yourself with the textbook multiple choice questions and note any that you miss that still don't make sense. Bring questions to chat!
- Go to the Moodle and take the quiz for this 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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