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Tropisms

QuestionAnswer
What is a stimulus A detectable change in the enviroment They are detected by receptors
What is a tropism When plants respond to the stimuli via growth They can be positive or negative Plants respond to gravity or light
What are tropisms controlled by These are controlled by IAA
What is IAA IAA can control cell elongation in shoots and inhibit growth of cells in the roots. It is made in the tip or the roots and shoots but can diffuse to other cells
Phototropism in shoots Plant grow and bend towards light due to light being needed for the LDR
This happens through The shoot tip produces IAA causing cell elongation IAA diffuses into other cells If light is coming from one direction IAA will diffuse to the shaded side making higher conc of IAA on this side Cells on shaded side elongate so plant bends to light.
Phototropism in roots Roots dont photosythensise so dont require light They must anchor the plant deep in soil
What happens to IAA in roots A high concentration of IAA inhibits cell elongation causing roots cells to elongate more on the lighter side and so the roots bend away from light. This negative phototropism
Gravitropism in shoots The IAA will diffuse from the upper side to the lower side of a shoot If a plant is vertical this causes plant cells to elongate and the plant grows upwards If a plant is on its side it will cause the shoot to bend upwards. (negative gravitropism)
Gravitropism in the roots IAA moves to the lowerside of roots so that the upper side elongates and the roots bends down towards gravity and anchors the plant in This is a positive gravitropism
Created by: yHya
 

 



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