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6685258
Plant Responces
Description
Mind map for Plant Responces in OCR Biology A Module 5
No tags specified
a level biology
module 5
plant responces
ocr biology a
biology
a level
Mind Map by
Matthew Gaisford St. Lawrence
, updated more than 1 year ago
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Created by
Matthew Gaisford St. Lawrence
about 8 years ago
34
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Resource summary
Plant Responces
Tropism
The Responce of a plant to directional stimulus
Phototropism
Geotropism
Hydrotropism
Thermotropism
Thigmotropism
Growth Hormones
Auxin
Stimulates growth of shoots by cell elongation
Apical Dominance
Prevents side shoot formation
inhibits leaf loss
Gibberellin
Stimulates seed germination, stem elongation, side shoot formation and flowering
Produced in young leaves
Triggers the breakdown of starch into glucose in the seed
Indoleacetic Acid (IAA)
Moved around the plant to control tropisms
G+A are often synergistic - work together
And can be antagonistic - oppose each others actions
Ethene
Stimulates leaf loss in winter
Produced by ageing leaves
Abscisic Acid
Triggers stomatal closure
External Stimuli
Tannins
Toxic to microorganisms and herbivores. They bind to proteins in the gut, making the plant hard to digest
Alkaloids
A feeding deterrent to animals, tasting bitter. Located in the growing tips and flowers
Pheromones
A chemical released by one individual that can affect the physiolgy of another
Commercial uses
Auxins
Take cuttings from a larger plant
Seedless Fruit
Herbicides
Promote growth - stem buckles
Gibberellins
Brewing
Sugar Production
Fruit Production
Ethene
Speed up fruit ripning
Cytokynes
Prevent yellowing of lettuice leaves
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