topic 8: tropisms

Section 2: Structures and functions in living organisms j) Coordination and response
2.80 understand that plants respond to stimuli
2.81 describe the geotropic responses of roots and stems
2.82 describe positive phototropism of stems

tropism
directional stimuli   positive tropism
             

hydrotropism coleoptiles
hormone
auxin  

abscisic acid
ethylene
gibberellin
clinostat

phototropism
geotropism             plant growth substance

negative tropism
hormone
cytokinins

Plant Response to the Environment (ppt)
Plant Response to the Environment (study guide)
Plant Tropism worksheet
Useful Links:

Growth and Plant Hormones from Biology Online
Tropisms from BBC Bitesize
Some great examples of various types of tropisms videos from Plants in Motion
Auxins animation from KScience


Learning Outcomes:


Video Clips: