Name ____________________________________________
Per _____ Date _______
Plant Tropisms
Directions Watch the following video links to complete the worksheet below on plant hormones and plant tropisms;
pause the videos when needed to answer the questions below.
Video Links
Link 1 https://www.youtube.com/watch?v=pCFstSMvAMI Google Search “Biology Lesson Idea – Plants, Tropisms, and
Hormones”
Link 2 http://education-portal.com/academy/lesson/tropisms-phototropic-geotropic-and-thigmotropic-plantgrowth.html#lesson
Link 3 http://plantsinmotion.bio.indiana.edu/plantmotion/movements/tropism/tropisms.html
Each of these videos were created through experimentation and/or data collection – please the scenario in yellow
to understand what you are watching and why.
 Watch “Cool Corn Phototropism” 10 minute intervals for 18 hours
 Watch “Arabidopsis Shoot Gravitropism”
 Watch “Sunflower Solar Tracking”
 Watch Nastic Movements “Venus Fly Trap”
 Watch Nastic Movements “Morning Glory Twining”
 Watch Nastic Movements “Sunflower Nutation”
Link 4 https://www.youtube.com/watch?v=uX5eoxKbzHE Google Search “Tropisms Song”
1. What is a plant tropism?
2. What is the different between positive and negative tropism?
3. What are each of the following tropisms:
Tropism
Definition
Geo/gravitropism
Hydrotropism
Phototropism
Thigmotropism
4. How does the response of a root to the pull of gravity help a plant?
Image
5. Consider plant roots and stems. Which tropism affects both these plant tissues? Which tissue experiences negative
tropism versus which experiences positive tropisms?
6. Do any tropisms affect only one of those plant organs? Explain.
7. Based on your observations, do plants respond and change the way they grow depending on where the light is?
Which tropism is this?
8. What are the major hormones that effect plant growth and what tropism do they effect?
Match the boxes below with the correct tropism; be sure to indicate if it is a negative or positive tropism.
Image
Image
Image
Image